NAVISTAR FINANCIAL SECURITIES CORP
424B3, 1997-07-31
ASSET-BACKED SECURITIES
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<PAGE>   1

                                          Filed pursuant to Rule 424(b)(3)    
                                          Registration Statement No. 333-30737


 
            PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JULY 30, 1997
                   SUBJECT TO COMPLETION, DATED JULY 30, 1997
 
                  NAVISTAR FINANCIAL DEALER NOTE MASTER TRUST
 
                                  $200,000,000
       FLOATING RATE DEALER NOTE ASSET BACKED CERTIFICATES, SERIES 1997-1
 
               NAVISTAR FINANCIAL SECURITIES CORPORATION, SELLER
                    NAVISTAR FINANCIAL CORPORATION, SERVICER
                            ------------------------
 
  The Floating Rate Dealer Note Asset Backed Certificates, Series 1997-1 (the
  "Series 1997-1 Certificates") offered hereby evidence undivided interests in
 certain assets of the Navistar Financial Dealer Note Master Trust (the "Master
 Trust" or the "Issuer") created pursuant to a Pooling and Servicing Agreement
  (the "Pooling and Servicing Agreement") among Navistar Financial Corporation
("NFC" or the "Servicer"), Navistar Financial Securities Corporation ("NFSC" or
 the "Seller"), The Chase Manhattan Bank, as Trustee under the 1990 Trust, and
The Bank of New York, as trustee (the "Master Trust Trustee"). The Master Trust
 assets in which the Series 1997-1 Certificates have an undivided interest will
 include, initially, the Class A-5 Floating Rate Pass-Through Certificate (the
  "Class A-5 Investor Certificate") issued by the Dealer Note Trust 1990 (the
"1990 Trust") created pursuant to a Pooling and Servicing Agreement dated as of
 December 1, 1990 (as amended, the "1990 Trust Agreement") among NFSC, NFC and
  The Chase Manhattan Bank, as trustee. Following the termination of the 1990
  Trust, the Master Trust assets in which the Series 1997-1 Certificateholders
 will have an interest will include the Dealer Notes and other assets described
    in the accompanying Prospectus dated August   , 1997 (the "Prospectus").
 
    Interest on the Series 1997-1 Certificates will generally be paid on the
     twenty-fifth day of each month commencing September 25, 1997 (each, a
   "Distribution Date"). The interest rate will be      % for the period from
  August   , 1997 (the "Closing Date") through September 24, 1997 and for each
 Distribution Period thereafter will be equal to LIBOR (as defined herein) plus
      % (the "Offered Certificate Rate"). The payment of principal with respect
 to the Series 1997-1 Certificates is expected to be made in full on the August
  2003 Distribution Date (the "Expected Payment Date"). However, under certain
  circumstances, the actual payment in full of the Series 1997-1 Certificates
          could occur earlier or later than the Expected Payment Date.
SEE "RISK FACTORS" AT PAGE 26 IN THE ACCOMPANYING PROSPECTUS FOR A DISCUSSION OF
MATERIAL RISKS THAT SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS IN CONNECTION
             WITH AN INVESTMENT IN THE SERIES 1997-1 CERTIFICATES.
  THE SERIES 1997-1 CERTIFICATES REPRESENT BENEFICIAL INTERESTS IN THE MASTER
 TRUST ONLY AND DO NOT REPRESENT INTERESTS IN OR OBLIGATIONS OF THE SELLER, THE
                       SERVICER OR ANY AFFILIATE THEREOF.
 
                            ------------------------
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
   ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                  UNDERWRITING
                                            PRICE TO             DISCOUNTS AND            PROCEEDS TO
                                             PUBLIC               COMMISSIONS              SELLER(1)
                                     ----------------------  ----------------------  ----------------------
<S>                                  <C>                     <C>                     <C>
Series 1997-1 Certificates.........            %                       %                       %
Total..............................            $                       $                       $
</TABLE>
 
- ---------------
 
(1) Before deducting expenses payable by the Seller estimated to be $500,000.
 
                            ------------------------
 
    The Series 1997-1 Certificates are offered by the Underwriter, subject to
prior sale, when, as and if issued by the Seller and accepted by the
Underwriter. The Underwriter reserves the right to withdraw, cancel or modify
such offer and reject orders in whole or in part. It is expected that the Series
1997-1 Certificates will be delivered in book-entry form through the facilities
of the Depository Trust Company, Cedel Bank, societe anonyme, and the Euroclear
System on or about August   , 1997, against payment therefor in immediately
available funds.
 
                           CREDIT SUISSE FIRST BOSTON
                  PROSPECTUS SUPPLEMENT DATED AUGUST   , 1997.
 
     THIS PROSPECTUS SUPPLEMENT RELATES TO AN EFFECTIVE REGISTRATION STATEMENT
     UNDER THE SECURITIES ACT OF 1933, AND IS SUBJECT TO COMPLETION OR
     AMENDMENT. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
     SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
<PAGE>   2
 
     CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE SERIES 1997-1
CERTIFICATES, INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING
TRANSACTIONS IN THE SERIES 1997-1 CERTIFICATES AND THE IMPOSITION OF A PENALTY
BID, DURING AND AFTER THE OFFERING. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE
"UNDERWRITING."
 
     The Seller has not authorized any offer of Series 1997-1 Certificates to
the public in the United Kingdom within the meaning of the Public Offers of
Securities Regulations 1995 (the "UK Regulations"). The Series 1997-1
Certificates may not lawfully be offered or sold to persons in the United
Kingdom except in circumstances which do not result in an offer to the public in
the United Kingdom within the meaning of the U.K. Regulations or otherwise are
in compliance with all applicable provisions of the U.K. Regulations.
 
     THE SERIES 1997-1 CERTIFICATES OFFERED BY THIS PROSPECTUS SUPPLEMENT
CONSTITUTE PART OF A SEPARATE SERIES OF OFFERED CERTIFICATES BEING OFFERED BY
THE SELLER PURSUANT TO ITS PROSPECTUS DATED JULY 30, 1997, OF WHICH THIS
PROSPECTUS SUPPLEMENT IS A PART AND WHICH ACCOMPANIES THIS PROSPECTUS
SUPPLEMENT. THE PROSPECTUS CONTAINS IMPORTANT INFORMATION REGARDING THIS
OFFERING WHICH IS NOT CONTAINED HEREIN, AND PROSPECTIVE INVESTORS ARE URGED TO
READ THE PROSPECTUS AND THIS PROSPECTUS SUPPLEMENT IN FULL. SALES OF THE SERIES
1997-1 CERTIFICATES MAY NOT BE CONSUMMATED UNLESS THE PURCHASER HAS RECEIVED
BOTH THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS.
 
     There is currently no secondary market for the Series 1997-1 Certificates,
and there is no assurance that one will develop. The Underwriter expects, but is
not obligated, to make a market in the Series 1997-1 Certificates. However, even
if the Underwriter does make such a market, there is no assurance that any such
market will continue.
 
     Capitalized terms used and not defined herein have the meanings they are
given in the Prospectus.
 
                                       S-2
<PAGE>   3
 
                                THE DEALER NOTES
 
GENERAL
 
     Dealer Notes that are conveyed to the Active Trust consist of all wholesale
notes issued by Dealers that are identified by the Servicer as meeting the
eligibility criteria specified in the Applicable Agreement for Dealer Notes. In
order to be eligible, each Dealer Note must be issued pursuant to NFC's Credit
Guidelines and meet certain other criteria provided in the Agreement. See
"Description of the Offered Certificates -- Eligible Dealer Notes" and
"-- Certain Representations and Warranties; Ineligible Dealer Notes; Purchase of
Certificateholders' Interest" in the Prospectus. The aggregate principal amount
of Eligible Dealer Notes as of the Closing Date is expected to be in excess of
$600 million.
 
     The following tables provide general statistics regarding the total
portfolio of wholesale notes serviced by NFC (the "Wholesale Portfolio") for the
periods ended on the dates specified. As of the Closing Date, the Dealer Notes
which are expected to be held in the 1990 Trust will represent approximately 95%
of the Wholesale Portfolio. However, there can be no assurance that the Dealer
Notes which are transferred to the 1990 Trust after the Closing Date and which,
after the 1990 Trust Termination Date, will be transferred to the Master Trust,
will continue to constitute such a significant portion of the Wholesale
Portfolio. There can be no assurance that the experience of the Dealer Notes in
the future will be similar to the historical experience set forth below.
 
     The Seller believes that the improved performance of the Wholesale
Portfolio since fiscal year 1992 is largely attributable to the improved United
States economy since 1992. Fluctuations in net losses and delinquencies in the
Wholesale Portfolio generally follow cycles in the overall business environment
and, the Seller believes, are particularly sensitive to the industrial sector,
which generates a significant portion of freight tonnage hauled. Truck demand
and Wholesale Portfolio performance also depend on general economic conditions,
interest rates and fuel costs.
 
                                       S-3
<PAGE>   4
 
LOSS EXPERIENCE
 
     The following table provides the loss experience on the Wholesale Portfolio
for the periods indicated:
 
                  LOSS EXPERIENCE FOR THE WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
<TABLE>
<CAPTION>
                                                                                           ANNUALIZED
                                                                                           NET LOSSES
                                                                                          (RECOVERIES)/
                                                                                             AVERAGE
    FISCAL YEAR-                                           NET LOSSES        AVERAGE         DEALER
   TO-DATE PERIOD      NET DEALER NOTE    LIQUIDATIONS    (RECOVERIES)/    DEALER NOTE        NOTES
     ENDING LAST           LOSSES          OF DEALER      LIQUIDATIONS      PRINCIPAL       PRINCIPAL      ANNUALIZED
       DAY OF          (RECOVERIES)(1)      NOTES(1)           (1)         BALANCE(2)      BALANCE(3)      TURNOVER(4)
   --------------      ---------------    ------------    -------------    -----------    -------------    -----------
<S>                    <C>                <C>             <C>              <C>            <C>              <C>
Fiscal Year 1997
  January............       $ 0.0           $  599.7           0.00%         $690.2            0.00%          3.48x
  April..............        (0.1)           1,232.1          (0.01)          683.2           (0.03)          3.61x
Fiscal Year 1996
  January............         0.1              721.6           0.01           913.0            0.04           3.16x
  April..............         0.0            1,436.2           0.00           920.3            0.00           3.12x
  July...............         0.0            2,139.8           0.00           906.5            0.00           3.15x
  October............        (0.2)           2,874.4          (0.01)          859.7           (0.02)          3.34x
Fiscal Year 1995
  January............        (0.1)             618.6          (0.01)          597.5           (0.07)          4.14x
  April..............        (0.1)           1,237.5          (0.01)          643.9           (0.03)          3.84x
  July...............        (0.3)           1,963.3          (0.02)          689.7           (0.06)          3.80x
  October............        (0.9)           2,712.4          (0.03)          706.0           (0.13)          3.84x
Fiscal Year 1994
  January............         0.1              485.6           0.03           576.8            0.07           3.37x
  April..............         0.1            1,024.8           0.01           593.6            0.03           3.45x
  July...............         0.1            1,656.1           0.01           602.5            0.02           3.66x
  October............         0.1            2,278.9           0.01           579.2            0.03           3.93x
Fiscal Year 1993
  January............         0.0              377.1           0.00           431.1            0.00           3.50x
  April..............         0.4              795.2           0.05           461.2            0.17           3.45x
  July...............         0.9            1,283.5           0.07           475.3            0.25           3.60x
  October............         0.8            1,820.1           0.04           477.1            0.16           3.81x
Fiscal Year 1992
  January............         1.0              312.6           0.32           390.0            1.03           3.21x
  April..............         1.1              646.0           0.18           414.2            0.53           3.12x
  July...............         1.2            1,047.0           0.12           433.4            0.37           3.22x
  October............         0.8            1,501.7           0.06           428.9            0.20           3.50x
 
<CAPTION>
 
                        AVERAGE
                        MATURITY
    FISCAL YEAR-        (DAYS IN
   TO-DATE PERIOD        YEAR/
     ENDING LAST       ANNUALIZED
       DAY OF          TURNOVER)
   --------------      ----------
<S>                    <C>
Fiscal Year 1997
  January............    105.2
  April..............    101.4
Fiscal Year 1996
  January............    115.5
  April..............    117.0
  July...............    116.2
  October............    109.3
Fiscal Year 1995
  January............     88.2
  April..............     95.1
  July...............     96.3
  October............     95.1
Fiscal Year 1994
  January............    108.3
  April..............    105.8
  July...............     99.7
  October............     92.9
Fiscal Year 1993
  January............    104.3
  April..............    105.8
  July...............    101.4
  October............     95.8
Fiscal Year 1992
  January............    113.7
  April..............    117.0
  July...............    113.4
  October............    104.3
</TABLE>
 
- -------------------------
(1) Figures shown for Net Dealer Note Losses and Liquidations of Dealer Notes
    are cumulative within each fiscal year. Thus, figures as of January 31 of
    each fiscal year represent the Net Dealer Note Losses or Liquidations of
    Dealer Notes for the first quarter of such fiscal year; figures as of April
    30 of each fiscal year represent the cumulative Net Dealer Note Losses or
    Liquidations of Dealer Notes for the first six months of such fiscal year;
    and so on.
 
(2) Figures shown for Average Dealer Note Principal Balance are calculated as
    the year-to-date average of the daily outstanding Dealer Note Principal
    Balance.
 
(3) The Net Losses for a fiscal quarter used in the numerator are cumulative
    within a fiscal year and have been annualized. Thus, the numerator for the
    figure shown as of the fiscal quarter ended January 31 of each fiscal year
    equals the Net Dealer Note Losses for such fiscal quarter multiplied by
    four; for April 30 equals the cumulative Net Dealer Note Losses for the six
    months ended on such date multiplied by two; for July 31 equals the
    cumulative Net Dealer Note Losses for the nine months ended on such date
    multiplied by 4/3; and for October 31 equals such cumulative Net Dealer Note
    Losses.
 
(4) Turnover is calculated as the annualized Liquidations of Dealer Notes for
    each fiscal period (annualized in the same manner described in note 3 for
    Net Losses) divided by Average Dealer Note Principal Balance.
 
                                       S-4
<PAGE>   5
 
     Losses occur on wholesale notes when a Dealer has been terminated under
circumstances in which the Dealer has sold one or more financed vehicles to a
retail customer and has failed to remit the appropriate proceeds of such sale to
NFC. Losses also occur when used trucks financed at wholesale and repossessed by
NFC from a terminated Dealer cannot be sold for the balance due on the
underlying wholesale note. By contrast, losses generally have not occurred when
new trucks financed by NFC are repossessed from terminated Dealers, because such
new trucks are repurchased by the manufacturer Navistar International
Transportation Corp. ("NITC") or an OEM Supplier). NFC recognizes losses on
wholesale notes at the time it deems such wholesale notes to be uncollectible
(which is generally at the time it has exhausted all non-legal remedies).
 
     The characteristics of the Dealer Notes held by the Active Trust have not
been and are not expected to be significantly different from the characteristics
of the Wholesale Portfolio at any given time, except to the extent that the
eligibility requirements in the Applicable Agreement for Dealer Notes serve to
screen out certain types of wholesale notes at their inception (such as
wholesale notes from Dealers who are on cash on delivery terms or who are
insolvent, although Dealer Notes which have been or are transferred to the
Active Trust will not become ineligible if the Dealer thereafter is put on cash
on delivery status or becomes insolvent). Such differences are not expected to
affect adversely the performance of the Dealer Notes held by the Active Trust in
comparison to the Wholesale Portfolio at such time.
 
DELINQUENCIES
 
     The following table presents the aggregate amount of delinquent principal
payments (past due over 30 days) for the Wholesale Portfolio as a percentage of
the total principal amount outstanding as of the end of the fiscal quarters
specified:
 
            DELINQUENCIES AS A PERCENTAGE OF THE WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                 AMOUNTS OF
                                                                DEALER NOTE     DEALER NOTES
                                                                 PRINCIPAL     PAST DUE OVER
                        LAST DAY OF                             OUTSTANDING       30 DAYS
                        -----------                             -----------    -------------
<S>                                                             <C>            <C>       <C>
Fiscal Year 1997
  January...................................................      $651.3       $1.4      0.22%
  April.....................................................       670.2        2.1      0.31
Fiscal Year 1996
  January...................................................       927.6        0.6      0.06
  April.....................................................       909.7        0.8      0.09
  July......................................................       803.2        1.2      0.15
  October...................................................       685.9        1.3      0.19
Fiscal Year 1995
  January...................................................       611.3        0.6      0.11
  April.....................................................       766.0        0.3      0.04
  July......................................................       723.2        0.4      0.06
  October...................................................       854.4        0.4      0.05
Fiscal Year 1994
  January...................................................       564.5        0.6      0.11
  April.....................................................       638.0        0.6      0.09
  July......................................................       546.3        0.2      0.04
  October...................................................       586.5        0.4      0.06
Fiscal Year 1993
  January...................................................       447.4        1.4      0.32
  April.....................................................       522.9        1.0      0.19
  July......................................................       449.3        0.5      0.11
  October...................................................       559.0        0.7      0.13
Fiscal Year 1992
  January...................................................       435.3        2.8      0.64
  April.....................................................       452.6        2.0      0.44
  July......................................................       421.2        1.9      0.46
  October...................................................       402.3        1.6      0.40
</TABLE>
 
                                       S-5
<PAGE>   6
 
AGING EXPERIENCE
 
     The following table provides the age distribution of the Wholesale
Portfolio by principal amount outstanding as of the dates indicated:
 
                  AGE DISTRIBUTION OF THE WHOLESALE PORTFOLIO
 
<TABLE>
<CAPTION>
                                      APRIL 30                          OCTOBER 31
                                   --------------      --------------------------------------------
             DAYS                  1997      1996      1996      1995      1994      1993      1992
             ----                  ----      ----      ----      ----      ----      ----      ----
<S>                                <C>       <C>       <C>       <C>       <C>       <C>       <C>
1-180..........................     81%       76%       70%       84%       88%       87%       80%
181-360........................     11        20        21        14        10        11        16
Over 360.......................      8         4         9         2         2         2         4
                                   ---       ---       ---       ---       ---       ---       ---
  Total........................    100%      100%      100%      100%      100%      100%      100%
</TABLE>
 
CYCLICALITY
 
     The average outstanding principal amount of the Wholesale Portfolio has
varied historically according to business cycles in the truck manufacturing
industry. The following table provides the highest, lowest and average principal
amounts outstanding based on month-end balances during the years indicated:
 
            OUTSTANDING PRINCIPAL AMOUNT OF THE WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                    DURING                         HIGHEST      LOWEST      AVERAGE OF
                  YEAR ENDED                      MONTH-END    MONTH-END    MONTH-END
                 OCTOBER 31,                       AMOUNT       AMOUNT       AMOUNTS
                 -----------                      ---------    ---------    ----------
<S>                                               <C>          <C>          <C>
  1996........................................      $933         $686          $850
  1995........................................       854          588           709
  1994........................................       638          473           570
  1993........................................       559          425           475
  1992........................................       502          367           421
</TABLE>
 
                                       S-6
<PAGE>   7
 
GEOGRAPHIC DISTRIBUTION
 
     The following table provides the geographic distribution of the principal
amount of the Wholesale Portfolio as of April 30, 1997:
 
               GEOGRAPHIC DISTRIBUTION OF THE WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                       PERCENTAGE OF
                           AMOUNT        WHOLESALE
         STATE           OUTSTANDING     PORTFOLIO
         -----           -----------   -------------
<S>                      <C>           <C>
Illinois...............    $ 63.5           9.48%
Texas..................      49.9           7.45
Minnesota..............      48.4           7.22
Pennsylvania...........      42.6           6.35
Michigan...............      27.8           4.14
Maryland...............      27.5           4.11
Indiana................      27.0           4.03
Ohio...................      26.5           3.95
New York...............      24.4           3.63
Wisconsin..............      24.3           3.63
Tennessee..............      22.4           3.34
Virginia...............      22.3           3.33
Florida................      22.3           3.33
California.............      22.1           3.30
Oklahoma...............      18.4           2.74
</TABLE>
 
<TABLE>
<CAPTION>
                                       PERCENTAGE OF
                           AMOUNT        WHOLESALE
         STATE           OUTSTANDING     PORTFOLIO
         -----           -----------   -------------
<S>                      <C>           <C>
Alabama................    $ 13.6           2.03%
Georgia................      13.1           1.96
Missouri...............      12.7           1.90
New Jersey.............      12.4           1.85
Massachusetts..........      11.2           1.67
Mississippi............      10.6           1.59
Colorado...............       9.6           1.44
Arkansas...............       9.3           1.38
North Carolina.........       9.1           1.35
Louisiana..............       8.0           1.19
Nebraska...............       7.1           1.06
Connecticut............       7.0           1.05
All others(1)..........      77.1          11.50
                           ------         ------
     Total.............    $670.2         100.00%
</TABLE>
 
- -------------------------
(1) Includes the remaining 23 states (each of which represents less than 1% of
    the Wholesale Portfolio).
 
SEASONALITY
 
     The aggregate principal amount of the Wholesale Portfolio generally varies
during the year. The following table provides the average principal amount of
the Wholesale Portfolio during the months specified:
 
                SEASONAL FLUCTUATION IN THE WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                 AVERAGE MONTHLY AMOUNT
                                             OUTSTANDING DURING FISCAL YEAR
                                         ---------------------------------------
                 MONTH                   1997   1996   1995   1994   1993   1992
                 -----                   ----   ----   ----   ----   ----   ----
<S>                                      <C>    <C>    <C>    <C>    <C>    <C>
November...............................  $694   $876   $604   $578   $411   $358
December...............................   706    938    593    578    434    399
January................................   656    923    597    549    431    413
February...............................   658    925    633    567    459    433
March..................................   674    927    683    601    486    433
April..................................   677    928    749    649    514    448
May....................................          903    776    643    508    456
June...................................          898    814    638    501    489
July...................................          831    752    578    483    470
August.................................          759    705    508    453    415
September..............................          703    745    480    471    415
October................................          690    811    534    523    411
</TABLE>
 
     Declines in the principal amount of Dealer Notes outstanding due to
seasonality, cyclicality, competitive conditions or other factors may cause
Principal Collections to be invested in 1990 Trust Investment Securities
 
                                       S-7
<PAGE>   8
 
or Eligible Investments, as the case may be, rather than to be used for
acquisitions or assignments of Dealer Notes. See "Terms of the 1990 Trust
Investor Certificates--Application of Collections" and "Description of the
Offered Certificates -- Allocation of Collections After the 1990 Trust
Termination Date" in the Prospectus.
 
LIQUIDATIONS
 
     The following table provides the liquidation history with respect to NFC
month-end balances outstanding and one-month liquidations of notes in the
Wholesale Portfolio for the months indicated:
 
                   LIQUIDATION HISTORY OF WHOLESALE PORTFOLIO
                             (DOLLARS IN MILLIONS)
 
<TABLE>
<CAPTION>
                          NOV    DEC    JAN    FEB    MAR    APR    MAY    JUN    JUL    AUG    SEP    OCT
                          ---    ---    ---    ---    ---    ---    ---    ---    ---    ---    ---    ---
<S>                       <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Fiscal Year 1997
  Balances..............  $694   $655   $651   $668   $675   $670
  Liquidations..........   184    209    207    193    208    230
Fiscal Year 1996
  Balances..............   904    913    928    926    933    910   $896   $892   $803   $709   $694   $686
  Liquidations..........   236    236    250    222    243    249    237    216    251    267    219    249
Fiscal Year 1995
  Balances..............   599    588    611    656    737    766    809    806    723    707    778    854
  Liquidations..........   213    199    206    183    231    205    225    246    254    256    219    273
Fiscal Year 1994
  Balances..............   579    545    565    566    622    638    631    612    546    473    482    587
  Liquidations..........   157    182    147    153    192    194    210    206    215    236    189    198
Fiscal Year 1993
  Balances..............   428    425    447    473    508    523    504    525    449    450    482    559
  Liquidations..........   120    130    127    117    143    158    155    154    179    173    169    195
Fiscal Year 1992
  Balances..............   367    391    435    429    428    453    462    502    421    403    419    402
  Liquidations..........    92    105    116     97    109    127    107    128    166    149    138    168
</TABLE>
 
MONTHLY PAYMENT RATES
 
     The following table sets forth the highest and lowest monthly payment rates
for the Wholesale Portfolio in the periods shown and the average of the monthly
payment rates for all months during the periods shown, in each case calculated
as the percentage equivalent of a fraction, the numerator of which is the
aggregate of all collections of principal during the specified period and the
denominator of which is the aggregate ending principal balance of the Wholesale
Portfolio for such period. There can be no assurance that the rate of Principal
Collections for the Dealer Notes in the Active Trust will be similar to the
historical experience set forth below.
 
                        HISTORICAL MONTHLY PAYMENT RATES
 
<TABLE>
<CAPTION>
                                                 SIX MONTHS
                                               ENDED APRIL 30                 YEAR ENDED OCTOBER 31
                                               --------------      --------------------------------------------
                                               1997      1996      1996      1995      1994      1993      1992
                                               ----      ----      ----      ----      ----      ----      ----
<S>                                            <C>       <C>       <C>       <C>       <C>       <C>       <C>
Highest Month..............................    34.3%     27.4%     37.7%     36.2%     49.9%     39.9%     41.8%
Lowest Month...............................    26.5      24.0      24.0      26.8      26.0      24.7      22.6
Average for the Months in the Period.......    30.7      26.0      28.2      31.4      33.3      31.5      29.4
</TABLE>
 
                                       S-8
<PAGE>   9
 
                 DESCRIPTION OF THE SERIES 1997-1 CERTIFICATES
 
MASTER TRUST TRUSTEE
 
     The Bank of New York is the Master Trust Trustee. NFC and its affiliates
(other than the Seller) may from time to time enter into normal banking and
trustee relationships with The Bank of New York or any other bank that may
become a successor Master Trust Trustee. As of the date of this Prospectus
Supplement, the Corporate Trust Office is located at 101 Barclay Street, New
York, New York 10286, Attention: Corporate Trust Administration.
 
TERMS AND CONDITIONS
 
     The Series 1997-1 Certificates are a Series of Offered Certificates
described in the attached Prospectus to be issued by the Master Trust. In
addition to the terms and conditions set forth below, reference is made to the
Prospectus for the terms and conditions of the Series 1997-1 Certificates
(including a description of when principal and interest distributions are to be
made on, and settlement information for, the Series 1997-1 Certificates). Also,
see "Other Series Issued by Master Trust" for a description of Other Series
issued by the Master Trust which are outstanding as of the date of this
Prospectus Supplement.
 
<TABLE>
<S>                                                           <C>
Initial Invested Amount...................................    $200,000,000
Expected Payment Date.....................................    August 25, 2003
Subordinated Percentage...................................    15.5%
Specified Accumulation Period Commencement Date...........    November 1, 2002
Series Termination Date...................................    August 25, 2006
</TABLE>
 
     There will be no Investment Events with respect to the Series 1997-1
Certificates and thus there will be no Investment Period, Investment Period
Commencement Date, Investment Period Short Fall Amount or Fully Funded Date. In
addition, there will be no Negative Carry Reserve Fund with respect to the
Series 1997-1 Certificates and thus there will be no Negative Carry Reserve Fund
Deposit Amount, Negative Carry Reserve Fund Required Amount or Negative Carry
Subordinated Amount.
 
          "Accumulation Period Commencement Date" shall mean the first day of
     the nth full Due Period prior to the Expected Payment Date where n is the
     number of Due Periods in the Accumulation Period Length; provided, however,
     that the Accumulation Period Commencement Date shall be the Specified
     Accumulation Period Commencement Date if, on the Specified Accumulation
     Period Commencement Date, any other outstanding Series shall have entered
     into an investment period or an early amortization period; and provided
     further that, if the Accumulation Period Length and the Accumulation Period
     Commencement Date have been determined previously but the Accumulation
     Period has not commenced and any other outstanding Series shall enter into
     an investment period or any early amortization period, the Accumulation
     Period Commencement Date shall be the date that such outstanding Series
     shall have entered into an investment period or an early amortization
     period.
 
          "Accumulation Period Length" shall mean a period which is between one
     and nine Due Periods and which is determined by the Servicer in its sole
     discretion on or prior to the first day of the Due Period which is nine
     months prior to the Due Period related to the Distribution Date which is
     the Expected Payment Date.
 
          "Controlled Amortization Amount" shall mean an amount equal to (a) the
     Invested Amount as of the Distribution Date preceding the Accumulation
     Period Commencement Date divided by (b) the Accumulation Period Length.
 
          "LIBOR" shall mean (a) prior to the 1990 Trust Termination Date, the
     one-month London interbank offered rate as determined by the 1990 Trust
     Trustee in accordance with the 1990 Trust
 
                                       S-9
<PAGE>   10
 
     Agreement, and (b) after the 1990 Trust Termination Date, the interest rate
     determined by the Master Trust Trustee in accordance with the following
     provisions:
 
             (i) On each LIBOR Determination Date, LIBOR will be determined on
        the basis of the offered rates for deposits in United States Dollars
        having a one month maturity, which appear on the Reuters Screen LIBO
        Page as of 11:00 A.M., London time, on such LIBOR Determination Date.
        Such posted offered rates are for value on the second business day after
        which dealings in deposits in United States Dollars are transacted in
        the London interbank market. If at least two such offered rates appear
        on the Reuters Screen LIBO Page, the rate in respect of such LIBOR
        Determination Date will be the arithmetic mean (rounded, if necessary,
        to the nearest one hundred-thousandth of a percent) of such offered
        rates as determined by the Master Trust Trustee. If fewer than two
        offered rates appear, LIBOR in respect of such LIBOR Determination Date
        will be determined as if the parties had specified the rate described in
        (ii) below.
 
             (ii) On any LIBOR Determination Date on which fewer than two
        offered rates appear on the Reuters Screen LIBO Page as specified in (i)
        above, LIBOR will be determined on the basis of the rates at which
        deposits in United States Dollars are offered by the Reference Banks at
        approximately 11:00 A.M., London time, on such LIBOR Determination Date
        to prime banks in the London interbank market, having a one month
        maturity, such deposits commencing on the second London business day
        immediately following such LIBOR Determination Date and in a principal
        amount of not less than U.S. $1,000,000 that is representative for a
        single transaction in such market at such time. The Master Trust Trustee
        will request the principal London office of each of such Reference Banks
        to provide a quotation of its rate. If at least two such quotations are
        provided, LIBOR in respect of such LIBOR Determination Date will be the
        arithmetic mean (rounded, if necessary, to the nearest one
        hundred-thousandth of a percent) of such quotations. If fewer than two
        quotations are provided, LIBOR in respect of such LIBOR Determination
        Date will be the arithmetic mean (rounded, if necessary, to the nearest
        one hundred-thousandth of a percent) of the rates quoted by three major
        banks in The City of New York selected by the Master Trust Trustee at
        approximately 11:00 A.M., New York City time, on such LIBOR
        Determination Date for loans in United States Dollars to leading
        European banks, having a one month maturity, such loans commencing on
        the second London business day immediately following such LIBOR
        Determination Date and in a principal amount of not less than U.S.
        $1,000,000 that is representative for a single transaction in such
        market at such time, provided, however, that if the banks in The City of
        New York selected as aforesaid by the Master Trust Trustee are not
        quoting as mentioned in this sentence, LIBOR with respect to such LIBOR
        Determination Date will be LIBOR in effect immediately prior to such
        LIBOR Determination Date.
 
          "LIBOR Determination Date" means, with respect to any Distribution
     Period, the date which is two London business days prior to the start of
     such Distribution Period.
 
          "Minimum Series Seller's Interest" shall mean, with respect to any
     business day after the 1990 Trust Termination Date, the sum of (a) the
     Available Subordinated Amount as of the end of the preceding Transfer Date
     and (b) the Required Excess Seller Interest as of the end of the preceding
     Distribution Date.
 
          "New Vehicle Monthly Interest Rate" shall mean, with respect to any
     Due Period, the product of (a) the per annum rate of interest and finance
     charges billed by NFC during such Due Period on Dealer Notes financing new
     vehicles and (b) the quotient of (i) the number of days during such Due
     Period and (ii) the actual number of days in the related calendar year.
 
          "Offered Certificate Rate" shall mean the interest rate on the Series
     1997-1 Certificates, which shall be calculated on the basis of actual days
     elapsed and a 360-day year, and will be      % for the period from August
       , 1997 (the "Closing Date") through September 24, 1997 and for each
     Distribution Period thereafter will equal LIBOR as of the related LIBOR
     Determination Date plus      %.
 
                                      S-10
<PAGE>   11
 
          "Projected Dealer Note Income" shall mean, on any Transfer Date after
     the 1990 Trust Termination Date, an amount equal to the sum of (a) the
     product of (i) the principal amount of Dealer Notes financing new vehicles
     outstanding on such Transfer Date, (ii) the New Vehicle Monthly Interest
     Rate for the Due Period in which such Transfer Date occurs and (iii) the
     Series Allocation Percentage for such Due Period and (b) the product of (i)
     the principal amount of Dealer Notes financing used vehicles outstanding on
     such Transfer Date, (ii) the Used Vehicle Monthly Interest Rate for such
     Due Period and (iii) the Series Allocation Percentage for such Due Period.
 
          "Projected Monthly Interest" shall mean, on any LIBOR Determination
     Date after the 1990 Trust Termination Date with respect to the related
     Distribution Period, an amount equal to the product of (a) the Offered
     Certificate Rate for such Distribution Period, (b) the Invested Amount as
     of the immediately preceding Distribution Date and (c) the result of (i)
     the actual number of days in such Distribution Period divided by (ii) 360.
 
          "Projected Monthly Servicing Fee" shall mean, on any Transfer Date
     after the 1990 Trust Termination Date with respect to the Due Period in
     which such Transfer Date occurs, an amount equal to one-twelfth of the
     product of (a) 1%, (b) the aggregate principal amount of Dealer Notes as of
     such Transfer Date, (c) the Series 1997-1 Allocation Percentage for the Due
     Period related to such Transfer Date and (d) the Floating Allocation
     Percentage for the Due Period related to such Transfer Date.
 
          "Projected Spread" shall mean, on any Transfer Date after the 1990
     Trust Termination Date with respect to the Distribution Period next
     following the Distribution Period to which such Transfer Date relates, the
     sum of (a) the positive amount, if any, by which (i) the sum of (A)
     Projected Monthly Interest for such Distribution Period and (B) the
     Projected Monthly Servicing Fee for the Due Period in which such Transfer
     Date occurs exceeds (ii) the Projected Dealer Note Income as of such
     Transfer Date and (b) 1.25% of the Invested Amount as of the preceding
     Distribution Date.
 
          "Reference Banks" shall mean the principal London offices of Morgan
     Guaranty Trust Company of New York, Swiss Bank Corporation and Barclays
     Bank PLC.
 
          "Required Excess Seller Interest" shall mean, with respect to any
     business day, 3.0% of the Invested Amount as of the end of the preceding
     Distribution Date (and such percentage shall be the "Required Excess Seller
     Interest Percentage").
 
          "Required Subordinated Amount" shall mean, with respect to any
     Transfer Date related to a Due Period commencing after the 1990 Trust
     Termination Date, an amount equal to 87.1% of the Maximum Subordinated
     Amount as of such Transfer Date.
 
          "Series Allocable Servicing Fee" shall equal, for each Due Period
     commencing after the 1990 Trust Termination Date and occurring prior to the
     earlier of the first Distribution Date following the Series Termination
     Date and the first Distribution Date on which the Invested Amount is zero,
     an amount equal to one-twelfth of the product of (a) 1%, (b) the aggregate
     principal amount of Dealer Notes outstanding as of the last day of such Due
     Period, and (c) the Series Allocation Percentage with respect to such Due
     Period.
 
          "Used Vehicle Monthly Interest Rate" shall mean, with respect to any
     Due Period, the product of (a) the per annum rate of interest and finance
     charges billed by NFC during such Due Period on Dealer Notes financing used
     vehicles and (b) the quotient of (i) a number equal to the number of days
     during such Due Period and (ii) the actual number of days in the related
     calendar year.
 
RATINGS OF THE CERTIFICATES
 
     It is a condition to issuance of the Series 1997-1 Certificates that they
be rated in the highest long-term rating category by each of Standard and Poor's
Ratings Services and Moody's Investors Service, Inc. The rating of the Series
1997-1 Certificates addresses the likelihood of the timely payment of interest
at the Offered Certificate Rate and the ultimate payment of principal by the
Series Termination Date on the Series 1997-1 Certificates. However, a Rating
Agency does not evaluate, and the rating of the Series 1997-1
 
                                      S-11
<PAGE>   12
 
Certificates does not address, the likelihood that the outstanding principal
amount of the Series 1997-1 Certificates will be paid on the Expected Payment
Date or the likelihood of the payment of any penalty interest. The rating of the
Series 1997-1 Certificates is based primarily on the value of the Class A-5
Investor Certificate and the Dealer Notes and the rating requirements for
investments of funds in Eligible Deposit Accounts maintained for the benefit of
the Series 1997-1 Certificateholders and the level of subordination of the 1990
Trust Seller Interest and the Master Trust Seller's Interest. A rating is not a
recommendation to buy, sell or hold securities, inasmuch as such rating does not
comment as to the market price or the suitability for a particular investor.
There is no assurance that a rating will remain for any given period of time or
that a rating will not be lowered or withdrawn entirely by a Rating Agency if in
its judgment circumstances in the future so warrant.
 
EARLY AMORTIZATION EVENTS
 
     An "Early Amortization Event" with respect to Series 1997-1 refers to any
of the following events:
 
          (a) the Master Trust becomes an "investment company" within the
     meaning of the Investment Company Act of 1940, as amended, and is not
     exempt from compliance with such Act;
 
          (b) the Invested Amount is not reduced to zero by the Expected Payment
     Date;
 
          (c) the United States government or any agency or instrumentality
     thereof files a notice of a lien under Internal Revenue Code sec. 6323 or
     any similar statutory provision (including, but not limited to, sec. 302(f)
     or sec. 4068 of ERISA) on the assets of NFC or NFSC which is or may in the
     future be prior to the lien of the Master Trust Trustee on the assets of
     the Master Trust (including without limitation proceeds of the Dealer
     Notes);
 
          (d) failure on the part of the Seller (i) to make any payment,
     distribution or deposit required under the Pooling and Servicing Agreement
     on the date due or within five business days thereafter or (ii) to observe
     or perform in any material respect any other material covenants or
     agreements of the Seller, which continues unremedied for a period of 60
     days after written notice of such failure shall have been given to the
     Seller;
 
          (e) any representation or warranty made by the Seller pursuant to the
     Pooling and Servicing Agreement or any information contained in the
     schedule of Dealer Notes delivered thereunder shall prove to have been
     incorrect in any material respect when made or when delivered, which
     representation, warranty or schedule, or the circumstances or condition
     that caused such representation, warranty or schedule to be incorrect,
     continues to be incorrect or uncured in any material respect for a period
     of 60 days after written notice of such incorrectness shall have been given
     to the Seller and as a result of which the interests of the Series 1997-1
     Certificateholders are materially and adversely affected, except that an
     Early Amortization Event shall not be deemed to occur if the Seller has
     repurchased the related Dealer Notes or all such Dealer Notes, if
     applicable, during such period in accordance with the provisions of the
     Pooling and Servicing Agreement;
 
          (f) after the 1990 Trust Termination Date, the Seller shall become
     legally unable for any reason to transfer Dealer Notes to the Master Trust
     in accordance with the provisions of the Pooling and Servicing Agreement;
 
          (g) on any Transfer Date related to a Due Period commencing after the
     1990 Trust Termination Date, the Available Subordinated Amount for such
     Transfer Date will be reduced to an amount less than the Required
     Subordinated Amount;
 
          (h) any Servicer Termination Event shall occur (i) which would have a
     material adverse effect on the Series 1997-1 Certificateholders and (ii)
     for which the Servicer has received a notice of termination;
 
          (i) after the 1990 Trust Termination Date, the delivery by the Seller
     to the Master Trust Trustee of a notice stating that the Seller will no
     longer continue to sell Dealer Notes to the Master Trust commencing on the
     date specified in such notice;
 
          (j) after the 1990 Trust Termination Date, by reference to the
     Coverage Differentials (defined generally as the excess of the annualized
     yield on the Dealer Notes over an amount equal to the weighted average
     interest payable on the outstanding Series for each of the related Due
     Period and the three
 
                                      S-12
<PAGE>   13
 
     immediately preceding Due Periods), the sum of the three highest such
     Coverage Differentials divided by three (the "Average Coverage
     Differential") shall be equal to or less than negative two percent (2%) on
     each of three consecutive Determination Dates;
 
          (k) at the end of any Due Period commencing after the 1990 Trust
     Termination Date, the Master Trust Seller's Interest is reduced to an
     amount less than the Master Trust Minimum Seller's Interest and the Seller
     has failed to assign additional Dealer Notes or cash to the Master Trust in
     the amount of such deficiency within ten business days following the end of
     such Due Period;
 
          (l) on any Determination Date after the 1990 Trust Termination Date,
     the Turnover is less than 1.7;
 
          (m) on any Determination Date after the 1990 Trust Termination Date,
     the quotient of (i) the sum of Dealer Note Losses for each of the related
     Due Period and the five immediately preceding Due Periods and (ii) the sum
     of Principal Collections for each of the related Due Period and the five
     immediately preceding Due Periods, is greater than or equal to 1%;
 
          (n) at any time prior to the 1990 Trust Termination Date, a 1990 Trust
     Amortization Event occurs under the 1990 Trust with respect to the Related
     1990 Certificate (other than a 1990 Trust Amortization Event that also
     constitutes an Early Amortization Event under the Master Trust) or the
     Scheduled Class Amortization Date occurs with respect to the Related 1990
     Certificate;
 
          (o) the occurrence of certain events of bankruptcy, insolvency or
     receivership relating to the Seller, NFC, NITC or Navistar International
     Corporation ("NIC"); and
 
          (p) after the 1990 Trust Termination Date, failure on the part of NITC
     to make a deposit in the Interest Deposit Account required by the terms of
     the Master Trust Interest Deposit Agreement on or before the date occurring
     five business days after the date such deposit is required by the Master
     Trust Interest Deposit Agreement to be made.
 
     Upon the occurrence of Early Amortization Event (c), distributions in
respect of the Invested Amount will commence on the immediately succeeding
Distribution Date. Upon the occurrence of any other Early Amortization Event,
distributions in respect of the Invested Amount will commence at the time
described in the Prospectus.
 
                      OTHER SERIES ISSUED BY MASTER TRUST
 
     The table below sets forth the principal characteristics of the other
Series of investor certificates issued by the Master Trust which are outstanding
on the date of this Prospectus Supplement.
 
SERIES 1995-1
 
Certificate Rate...................................................LIBOR + 0.30%
Closing Date........................................................June 8, 1995
Expected Payment Date............................................August 25, 2004
Initial Invested Amount.............................................$200,000,000
Interest in 1990 Trust............................Class A-4 Investor Certificate
Number of classes within Series..............................................One
Ordinary means of principal repayment........................Accumulation Period
Primary source of credit enhancement...............................Subordination
Series Termination Date..........................................August 25, 2007
Servicing Fee Percentage......................................................1%
Subordinated Percentage....................................................15.5%
 
                                      S-13
<PAGE>   14
 
                        1990 TRUST INVESTOR CERTIFICATES
 
PRINCIPAL TERMS
 
     The principal terms of each Class of 1990 Trust Investor Certificates (the
"Principal Terms") are as follows:
 
     Related 1990 Certificate. The Class A-5 Investor Certificate is the Related
1990 Certificate to be issued to the Master Trust in connection with the
issuance of the Series 1997-1 Certificates, as described in the attached
Prospectus. The Class A-5 Investor Certificate will be issued by the 1990 Trust.
In addition to the terms and conditions set forth below, reference is made to
the Prospectus for the terms and conditions of the Class A-5 Investor
Certificate.
 
<TABLE>
<S>                                                           <C>
Class Initial Invested Amount...............................  $200,000,000
Class Initial Investor Interest.............................  $200,000,000
                                                                  July 25,
Class Termination Date......................................          2006
</TABLE>
 
     The Related 1990 Certificate Rate for the Class A-5 Investor Certificate
equals           . The "Scheduled Class Amortization Date" for the Class A-5
Investor Certificate shall mean the earlier of (a) August 25, 2003, and (b) the
date on which any Early Amortization Event with respect to the Series 1997-1
Certificates occurs.
 
Class A-2 Investor Certificates
 
<TABLE>
<S>                                                          <C>
Class Initial Invested Amount..............................      $100,000,000
Class Initial Investor Interest............................      $100,000,000
Class Certificate Margin...................................             0.85%
Scheduled Class Amortization Date..........................  December 1, 1997
Class Termination Date.....................................  January 25, 2002
</TABLE>
 
Class A-3 Investor Certificates
 
<TABLE>
<S>                                                          <C>
Class Initial Invested Amount..............................      $100,000,000
Class Initial Investor Interest............................      $100,000,000
Class Certificate Margin...................................             0.90%
Scheduled Class Amortization Date..........................  December 1, 1998
Class Termination Date.....................................  January 25, 2003
</TABLE>
 
Class A-4 Investor Certificates
 
<TABLE>
<S>                                                          <C>
Class Initial Invested Amount..............................      $207,860,000
Class Initial Investor Interest............................      $207,860,000
Class Certificate Margin...................................             0.30%
Class Termination Date.....................................     July 25, 2007
</TABLE>
 
     The "Scheduled Class Amortization Date" for the Class A-4 Investor
Certificate shall mean the earlier of (a) August 25, 2004 and (b) the date on
which any Early Amortization Event or Investment Event, in each case with
respect to the Series 1995-1 Certificates (the Series of certificates issued by
the Master Trust in connection with the Class A-4 Investor Certificate), occurs.
 
SUBORDINATION OF SELLER'S INTEREST
 
     The right of the holder of the 1990 Trust Seller Certificate to receive
payments in respect of the 1990 Trust Seller Interest is subordinated to the
interests of the 1990 Trust Investor Certificates, including the Class A-5
Investor Certificate, to the extent of the 1990 Trust Available Subordinated
Amount. As of the July 1997 Distribution Date (after giving pro forma effect to
the issuance of the Class A-5 Investor Certificate to the Master Trust and the
issuance of the Series 1997-1 Certificates by the Master Trust), the 1990 Trust
 
                                      S-14
<PAGE>   15
 
Available Subordinated Amount was $93 million. For additional information
regarding the subordination of the 1990 Trust Seller Interest, see "Terms of the
1990 Trust Investor Certificates -- Limited Subordination of the 1990 Trust
Seller Interest; 1990 Trust Available Subordinated Amount" in the Prospectus.
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in an underwriting agreement
(the "Underwriting Agreement"), the Seller has agreed to sell to Credit Suisse
First Boston Corporation (the "Underwriter"), and the Underwriter has agreed to
purchase from the Seller, all of the Series 1997-1 Certificates.
 
     The Seller has been advised by the Underwriter that it proposes initially
to offer the Series 1997-1 Certificates to the public at the price set forth on
the cover page hereof, and to certain dealers at such price less a concession
not in excess of    %. The Underwriter may allow, and such dealers may reallow
to certain other dealers, a subsequent concession not in excess of    %. After
the initial public offering, the public offering price and such concessions may
be changed.
 
     The Seller does not intend to apply for listing of the Series 1997-1
Certificates on a national securities exchange, but has been advised by the
Underwriter that it intends to make a market in the Series 1997-1 Certificates.
The Underwriter is not obligated, however, to make a market in the Series 1997-1
Certificates and may discontinue market making at any time without notice. No
assurance can be given as to the liquidity of the trading market for the Series
1997-1 Certificates.
 
     The Underwriter may engage in over-allotment, stabilizing transactions,
syndicate covering transactions and penalty bids in accordance with Regulation M
under the Exchange Act. Over-allotment involves syndicate sales in excess of the
offering size, which creates a syndicate short position. Stabilizing
transactions permit bids to purchase the underlying security so long as the
stabilizing bids do not exceed a specified maximum. Syndicate covering
transactions involve purchases of the Series 1997-1 Certificates in the open
market after the distribution has been completed in order to cover syndicate
short positions. Penalty bids permit the Underwriter to reclaim a selling
concession from a syndicate member when the Series 1997-1 Certificates
originally sold by such syndicate member are purchased in a syndicate covering
transaction to cover syndicate short positions. Such stabilizing transactions,
syndicate covering transactions and penalty bids may cause the prices of the
Series 1997-1 Certificates to be higher than they would otherwise be in the
absence of such transactions. These transactions, if commenced, may be
discontinued at any time.
 
     The Underwriter has represented and agreed that (a) it has not offered or
sold, and will not offer or sell, Series 1997-1 Certificates to persons in the
United Kingdom except to persons whose ordinary activities involve them in
acquiring, holding, managing or disposing of investments (as principal or agent)
for the purposes of their businesses or otherwise in circumstances which have
not resulted, and will not result in an offer to the public in the United
Kingdom within the meaning of the U.K. Regulations, (b) it has complied with and
will comply with all applicable provisions of the Financial Services Act of 1986
of Great Britain with respect to anything done by it in relation to the Series
1997-1 Certificates in, from or otherwise involving the United Kingdom and (c)
it has only issued or passed on and will only issue or pass on in the United
Kingdom any document in connection with the issue of the Series 1997-1
Certificates to a person who is of a kind described in Article 11(3) of the
Financial Services Act of 1986, as amended, (Investment Advertisement)
(Exceptions) Order 1996, as amended, or is a person to whom the document may
otherwise lawfully be issued or passed on.
 
     In the ordinary course of its business, the Underwriter and its affiliates
have engaged and may in the future engage in commercial banking or investment
banking transactions with affiliates of the Seller, including the Seller's
parent, NFC.
 
     The Seller has agreed to indemnify the Underwriter against certain
liabilities including liabilities under the Securities Act of 1933.
 
                                 LEGAL OPINIONS
 
     In addition to the legal opinions described in the Prospectus, certain
legal matters relating to the Series 1997-1 Certificates will be passed upon for
the Underwriter by Mayer, Brown & Platt.
 
                                      S-15
<PAGE>   16
 
                                 INDEX OF TERMS
 
<TABLE>
<S>                                                             <C>
1990 Trust..................................................          S-1
1990 Trust Agreement........................................          S-1
Accumulation Period Commencement Date.......................          S-9
Accumulation Period Length..................................          S-9
Average Coverage Differential...............................         S-13
Class A-5 Investor Certificate..............................          S-1
Closing Date................................................    S-1, S-10
Controlled Amortization Amount..............................          S-9
Distribution Date...........................................          S-1
Early Amortization Event....................................         S-12
Expected Payment Date.......................................     S-1, S-9
Initial Invested Amount.....................................          S-9
Issuer......................................................          S-1
LIBOR.......................................................          S-9
LIBOR Determination Date....................................         S-10
Master Trust................................................          S-1
Master Trust Trustee........................................          S-1
Minimum Series Seller's Interest............................         S-10
New Vehicle Monthly Interest Rate...........................         S-10
NFC.........................................................          S-1
NFSC........................................................          S-1
NIC.........................................................         S-13
NITC........................................................          S-5
Offered Certificate Rate....................................    S-1, S-10
Pooling and Servicing Agreement.............................          S-1
Principal Terms.............................................         S-14
Projected Dealer Note Income................................         S-11
Projected Monthly Interest..................................         S-11
Projected Monthly Servicing Fee.............................         S-11
Projected Spread............................................         S-11
Prospectus..................................................          S-1
Reference Banks.............................................         S-11
Required Excess Seller Interest.............................         S-11
Required Excess Seller Interest Percentage..................         S-11
Required Subordinated Amount................................         S-11
Scheduled Class Amortization Date...........................         S-14
Seller......................................................          S-1
Series 1997-1 Certificates..................................          S-1
Series Allocable Servicing Fee..............................         S-11
Series Termination Date.....................................          S-9
Servicer....................................................          S-1
Specified Accumulation Period Commencement Date.............          S-9
Subordinated Percentage.....................................          S-9
UK Regulations..............................................          S-2
Underwriter.................................................         S-15
Underwriting Agreement......................................         S-15
Used Vehicle Monthly Interest Rate..........................         S-11
Wholesale Portfolio.........................................          S-3
</TABLE>
 
                                      S-16
<PAGE>   17
 
PROSPECTUS
 
                  NAVISTAR FINANCIAL DEALER NOTE MASTER TRUST
                     DEALER NOTE ASSET BACKED CERTIFICATES
                            ------------------------
 
                   NAVISTAR FINANCIAL SECURITIES CORPORATION
                                     SELLER
                            ------------------------
 
                         NAVISTAR FINANCIAL CORPORATION
                                    SERVICER
                            ------------------------
 
     The Dealer Note Asset Backed Certificates described herein (the
"Certificates") each represent an undivided interest in certain assets of the
Navistar Financial Dealer Note Master Trust (the "Master Trust") created
pursuant to the Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement") entered into among Navistar Financial Corporation ("NFC" or the
"Servicer"), Navistar Financial Securities Corporation ("NFSC" or the "Seller"),
The Chase Manhattan Bank, as trustee under the 1990 Trust (as defined below),
and The Bank of New York, as trustee of the Master Trust (the "Master Trust
Trustee"). The Certificates may be offered and sold from time to time (the
"Offered Certificates"), in one or more series (each, an "Offered Series"), in
an amount (the "Initial Invested Amount"), at a price and on terms to be
determined at the time of sale and to be set forth in a supplement to this
Prospectus (each, a "Prospectus Supplement"). Interest on the Offered
Certificates will be paid on the twenty-fifth day of each month (or if such day
is not a business day, the next business day thereafter) (each, a "Distribution
Date"). If so provided in the Prospectus Supplement for an Offered Series, and
unless an Early Amortization Event occurs, upon the occurrence of certain events
described in such Prospectus Supplement an Investment Period with respect to
such Offered Series will commence and certain amounts allocable to the Offered
Certificates will be deposited in the Series Principal Account and used to make
principal payments with respect to the Offered Certificates on the Expected
Payment Date (or earlier or later under certain circumstances described herein
and in the Prospectus Supplement).
 
     The Navistar Financial Dealer Note Trust 1990 (the "1990 Trust") was formed
pursuant to a Pooling and Servicing Agreement, dated as of December 1, 1990,
among NFC, as Servicer, NFSC, as Seller, and The Chase Manhattan Bank, as
trustee (the "1990 Trust Trustee") (as it has been or may be supplemented and
amended, the "1990 Trust Agreement"). The corpus of the 1990 Trust includes,
among other things, wholesale dealer notes which are generated from time to time
in the ordinary course of business and are issued by dealers to finance
purchases of new and used medium and heavy duty trucks and new and used
trailers, all monies due or to become due with respect thereto, the interest of
the Seller in the security interests in the related financed vehicles, and all
proceeds of the foregoing. Prior to the date hereof, the 1990 Trust has issued
four classes of 1990 Trust Investor Certificates, the Class A-1, Class A-2,
Class A-3 and Class A-4 Investor Certificates. Of such 1990 Trust Investor
Certificates, only the Class A-4 Investor Certificate is included in the assets
of the Master Trust. Certain assets of the 1990 Trust have been allocated to the
holders of the 1990 Trust Investor Certificates (whether or not issued to the
Master Trust), each of which represents a fractional undivided interest in the
1990 Trust, including the right to receive varying percentages of the
collections with respect to the assets in the 1990 Trust.
                                                        (continued on next page)
                            ------------------------
THE OFFERED CERTIFICATES REPRESENT BENEFICIAL INTERESTS IN THE MASTER TRUST ONLY
AND DO NOT REPRESENT INTERESTS IN OR OBLIGATIONS OF THE SELLER, THE SERVICER OR
                             ANY AFFILIATE THEREOF.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                            ------------------------
 
     SEE "RISK FACTORS" AT PAGE 26 FOR A DISCUSSION OF MATERIAL RISKS THAT
SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS IN CONNECTION WITH AN INVESTMENT
IN THE OFFERED CERTIFICATES.
 
     Retain this Prospectus for future reference. This Prospectus may not be
used to consummate sales of Offered Certificates unless accompanied by a
Prospectus Supplement.
 
                 The date of this Prospectus is July 30, 1997.
<PAGE>   18
 
     Prior to the 1990 Trust Termination Date, (a) the assets of the Master
Trust will include the Class A-4 Investor Certificate, any 1990 Trust Investor
Certificate issued to the Master Trust in connection with the issuance of any
Offered Series (each, a "Related 1990 Certificate"), any 1990 Trust Investor
Certificate issued to the Master Trust in connection with the issuance of any
other series of certificates issued by the Master Trust (each, a "Subsequent
1990 Trust Investor Certificate"), any interest rate hedge or other enhancement
that the Master Trust may have entered into or obtained for the benefit of any
such series (any series of certificates issued by the Master Trust, including
any Offered Series, is referred to herein as a "Series"), the 1990 Trust Seller
Certificate, and all funds on deposit in certain accounts of the Master Trust,
(b) the dealer notes are sold on a daily basis to the Seller pursuant to the
1990 Trust Purchase Agreement between NFC and the Seller, and the Seller in turn
conveys the dealer notes on a daily basis to the 1990 Trust, and (c) the holders
of any Series of Offered Certificates (the "Offered Certificateholders") will
have an interest only in the Related 1990 Certificate, any interest rate hedge
or other enhancement that the Master Trust may have entered into or obtained for
the benefit of such Series of Offered Certificates, and all of the funds on
deposit in certain accounts of the Master Trust.
 
     As of the 1990 Trust Termination Date, if a 1990 Trust Early Amortization
Period shall not have occurred prior to such date, (a) the 1990 Trust will
transfer to the Master Trust all of the property of the 1990 Trust (other than
funds on deposit in respect of the Class A-2 or Class A-3 Investor Certificates,
the two outstanding classes of 1990 Trust Investor Certificates that are not
assets of the Master Trust), and (b) the Class A-4 Investor Certificate, each
Related 1990 Certificate, any Subsequent 1990 Trust Investor Certificate and the
1990 Trust Seller Certificate will automatically be canceled, and all rights of
the Master Trust with respect to such certificates will terminate.
 
     As of the 1990 Trust Termination Date and thereafter, (a) the assets of the
Master Trust will include all Dealer Notes transferred to the Master Trust by
the 1990 Trust and all Dealer Notes thereafter transferred to the Master Trust
by the Seller, all monies due or to become due with respect thereto and all
proceeds of such Dealer Notes, the interest of the Seller in the security
interests in the Financed Vehicles related to the Dealer Notes and the proceeds
thereof, the interest of the Seller in the Insurance Proceeds, each Interest
Rate Swap, interest rate cap, or other interest rate hedge, if any, that the
Master Trust may have entered into or obtained for the benefit of any Series,
and all funds on deposit in certain accounts of the Master Trust, (b) NFC will
sell Dealer Notes on a daily basis to the Seller pursuant to the Master Trust
Purchase Agreement (which will become effective upon the 1990 Trust Termination
Date), and the Seller in turn will convey on a daily basis the Dealer Notes to
the Master Trust, and (c) the Offered Certificateholders will have an interest
in and a right to receive a varying percentage of each month's collections with
respect to the dealer notes contained in the Master Trust as of such time. NFC
will service the dealer notes in its capacity as Servicer under the 1990 Trust
Agreement or the Pooling and Servicing Agreement, as applicable, and will
receive a monthly servicing fee as compensation for its servicing activities
thereunder.
 
     From time to time, subject to certain conditions, the Seller may designate
and offer other Series of certificates, which may have terms significantly
different from the terms of an Offered Series.
 
     The Seller will own the interest in the Master Trust not represented by the
Offered Certificates or the certificates of any other Series issued by the
Master Trust. A portion of the Master Trust Seller's Interest will be
subordinated to the rights of the Offered Certificateholders after the 1990
Trust Termination Date to the limited extent described herein. See "Description
of the Offered Certificates -- Allocations of Collections After the 1990 Trust
Termination Date -- Limited Subordination of Master Trust Seller's Interest;
Spread Account; Liquidity Reserve Account."
 
     There is currently no secondary market for the Offered Certificates, and
there is no assurance that one will develop. The underwriters with respect to an
Offered Series are expected, but are not obligated, to make a market in such
Offered Certificates. However, even if the underwriters do make such a market,
there is no assurance that any such market will continue.
 
     Delivery of the Offered Certificates is expected to be made in book-entry
form only through the facilities of The Depository Trust Company ("DTC").
 
                                        2
<PAGE>   19
 
                             AVAILABLE INFORMATION
 
     The Seller has filed a Registration Statement (the "Registration
Statement") under the Securities Act of 1933, as amended (the "Securities Act"),
with the Securities and Exchange Commission (the "Commission") with respect to
the Offered Certificates offered pursuant to this Prospectus and the related
Prospectus Supplement. This Prospectus, which forms part of the Registration
Statement, does not contain all of the information contained in the Registration
Statement and the exhibits thereto. For further information, reference is made
to the Registration Statement and the amendments thereof and the exhibits
thereto, which are available for inspection without charge at the public
reference facilities maintained by the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549; 7 World Trade Center, New York, New York 10048; and
Northwestern Atrium Center, Suite 1400, 500 West Madison Street, Chicago, IL
60601. Copies of the Registration Statement and the amendments thereof and the
exhibits thereto may be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates.
 
     The Master Trust is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, files reports and other information with the Commission.
Such reports and other information filed by the Company can be inspected and
copied at the public reference facilities maintained by the Commission at Room
1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and at
the regional offices of the Commission located at 7 World Trade Center, 13th
Floor, New York, New York 10048 and 500 West Madison Street, Suite 1400,
Chicago, Illinois 60601. Copies of such material can be obtained from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549 at prescribed rates. Electronic reports and other information filed
through the Commission's Electronic Data Gathering, Analysis and Retrieval
system are publicly available through the Commission's Web site
(http://www.sec.gov).
 
                   REPORTS TO THE OFFERED CERTIFICATEHOLDERS
 
     Unless and until Definitive Certificates are issued, monthly and annual
reports containing information concerning the Master Trust, prepared by the
Servicer, will be sent on behalf of the Master Trust to Cede & Co. ("Cede") (as
the registered holder of the Offered Certificates) to be available for
forwarding to holders of interests in the Offered Certificates. The Seller is
authorized to file, and will file on behalf of the Master Trust, such periodic
reports with respect to the Master Trust as are required to be filed pursuant to
the Exchange Act or any rules and regulations thereunder. The annual reports
will not contain financial information that has been examined and reported on by
independent public accountants.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following reports and documents filed by NFSC on behalf of the Master
Trust pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act are
hereby incorporated by reference in this Prospectus:
 
          (1) Annual Report on Form 10-K for the fiscal year ended October 31,
     1996; and
 
          (2) Current Reports on Form 8-K for December 24, 1996 and January 27,
     February 25, March 25, April 25, May 27, and June 24, 1997.
 
     All reports and other documents filed by NFSC on behalf of the Master Trust
pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to
the date of this Prospectus and prior to the termination of the offering of the
investor certificates shall be deemed to be incorporated by reference into this
Prospectus and to be a part hereof. Any statement contained herein or in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of this Prospectus to the
extent that a statement contained herein or in any other subsequently filed
document that also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as modified or superseded, to constitute
a part of this Prospectus.
 
                                        3
<PAGE>   20
 
     The Servicer will provide without charge to each person, including any
beneficial owner of investor certificates, to whom a copy of this Prospectus is
delivered, a copy of any and all the documents incorporated herein by reference
(other than exhibits to such documents) upon request. Requests should be
directed to Navistar Financial Corporation, 2850 West Golf Road, Rolling
Meadows, IL 60008 (telephone 847/734-4094).
 
                                        4
<PAGE>   21
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information appearing elsewhere in this Prospectus and by reference to the
information with respect to the Offered Certificates contained in the related
Prospectus Supplement to be prepared and delivered in connection with the
offering of such Offered Certificates. Certain capitalized terms used in this
Prospectus Summary are defined elsewhere in this Prospectus. A listing of the
pages on which terms are defined is found in the "Index of Terms."
 
SECURITIES OFFERED............   Dealer Note Asset Backed Certificates.
 
ISSUER........................   Navistar Financial Dealer Note Master Trust.
 
SELLER........................   Navistar Financial Securities Corporation, a
                                 wholly owned special purpose financing
                                 subsidiary of Navistar Financial Corporation.
 
SERVICER......................   Navistar Financial Corporation, a wholly owned
                                 subsidiary of Navistar International
                                 Transportation Corp.
 
MASTER TRUST TRUSTEE..........   The Bank of New York.
 
1990 TRUST TERMINATION DATE...   The "1990 Trust Termination Date" means the
                                 close of business on the date, which will be
                                 given retroactive effect, which is the last day
                                 of the Due Period related to the Distribution
                                 Date on which the Class Invested Amount of each
                                 of the Class A-1, A-2 and A-3 Investor
                                 Certificates is reduced to zero. In the absence
                                 of a 1990 Trust Amortization Event, the 1990
                                 Trust Termination Date will occur following the
                                 repayment of the Class Invested Amount for the
                                 Class A-3 Investor Certificates, which
                                 repayment will commence on the first
                                 Distribution Date following the Due Period
                                 commencing December 1, 1998.
 
                                 Prior to the 1990 Trust Termination Date, the
                                 principal assets held by the Master Trust will
                                 be the Class A-4 Investor Certificate, each
                                 Related 1990 Certificate, any Subsequent 1990
                                 Trust Investor Certificate, any associated
                                 Interest Rate Swap and the 1990 Trust Seller
                                 Certificate. Each Related 1990 Certificate will
                                 bear interest at a rate intended to provide
                                 sufficient cash flows to make required payments
                                 of interest on the Offered Certificates or on
                                 an associated Interest Rate Swap and will have
                                 an invested amount intended to be sufficient,
                                 in the event of early amortization of the 1990
                                 Trust, to repay the Invested Amount on the
                                 Offered Certificates or, in the event that such
                                 amortization event constitutes an Investment
                                 Period with respect to the Offered
                                 Certificates, to fund the Series Principal
                                 Account and the Negative Carry Reserve Fund. As
                                 described in more detail herein, prior to the
                                 1990 Trust Termination Date, the 1990 Trust
                                 will be the Active Trust and will hold the
                                 Dealer Notes and certain related assets and
                                 receive and allocate the collections and losses
                                 thereon to holders of the 1990 Trust Investor
                                 Certificates, including the Master Trust as
                                 holder of each Related 1990 Certificate. During
                                 this time, the Master Trust will be essentially
                                 a passive entity in which Collections received
                                 on each Related 1990 Certificate and any Net
                                 Swap Receipts will be used to make payments to
                                 Certificateholders, including the Offered
                                 Certificateholders, and any Net Swap Payments.
                                        5
<PAGE>   22
 
                                 Following the 1990 Trust Termination Date, the
                                 Master Trust will become the Active Trust. As
                                 described in more detail herein, the Dealer
                                 Notes and other assets held by the 1990 Trust
                                 will be transferred to the Master Trust, and
                                 the Master Trust will thereafter receive and
                                 allocate the Collections thereon to
                                 Certificateholders, including Offered
                                 Certificateholders.
 
MASTER TRUST PROPERTY.........   Until the occurrence of the 1990 Trust
                                 Termination Date the assets of the Master Trust
                                 will include (a) the 1990 Trust Seller
                                 Certificate transferred by the Seller to the
                                 Master Trust, all rights of the Seller
                                 thereunder and all other rights of the Seller
                                 under the 1990 Trust Agreement (including the
                                 right to exchange such 1990 Trust Seller
                                 Certificate for new classes of 1990 Trust
                                 Investor Certificates in the manner described
                                 herein, the right to receive distributions and
                                 other payments from the 1990 Trust, and the
                                 right to receive funds on deposit in the 1990
                                 Trust Liquidity Reserve Account, 1990 Trust
                                 Spread Account and 1990 Trust Interest Deposit
                                 Account), (b) the Class A-4 Investor
                                 Certificate, each Related 1990 Certificate and
                                 any Subsequent 1990 Trust Investor Certificate
                                 and all monies due or to become due with
                                 respect thereto, (c) each Interest Rate Swap,
                                 interest rate cap, or other interest rate
                                 hedge, if any, that the Master Trust may have
                                 entered into or obtained for the benefit of any
                                 Series and (d) all funds on deposit in certain
                                 accounts of the Master Trust, including funds
                                 on deposit in the Collections Account, the
                                 Series Principal Account, the Distribution
                                 Account, the Negative Carry Reserve Fund and
                                 any other Series Accounts created under a
                                 Supplement to the Pooling and Servicing
                                 Agreement.
 
                                 Each Related 1990 Certificate will be a
                                 newly-issued 1990 Trust Investor Certificate
                                 issued to the Master Trust in connection with
                                 the issuance of a Series of Offered
                                 Certificates. The Class Initial Invested Amount
                                 of the Related 1990 Certificate is expected to
                                 equal or exceed the Initial Invested Amount of
                                 the Offered Certificates. The Related 1990
                                 Certificate will bear interest at a floating
                                 rate equal to one month LIBOR plus a margin,
                                 which margin will be established as specified
                                 in the Prospectus Supplement. The Related 1990
                                 Certificate will represent an undivided
                                 interest in the 1990 Trust and will entitle the
                                 Master Trust, as the holder thereof, to share
                                 in the collections on the Dealer Notes held by
                                 the 1990 Trust ratably with each other series
                                 of 1990 Trust Investor Certificates issued by
                                 the 1990 Trust (including the Class A-4
                                 Investor Certificate, any Related 1990
                                 Certificate and any Subsequent 1990 Trust
                                 Investor Certificate) on the basis described
                                 herein. A Related 1990 Certificate will be
                                 transferred to the Master Trust in connection
                                 with the issuance of the Offered Certificates
                                 to provide a source of funds for the required
                                 payments thereon prior to the 1990 Trust
                                 Termination Date. Prior to such date, Dealer
                                 Notes issued to the 1990 Trust cannot be
                                 transferred to the Master Trust.
 
                                 As of the 1990 Trust Termination Date (a) the
                                 1990 Trust will transfer to the Master Trust
                                 all of its right, title and interest in and to
                                 all of the property of the 1990 Trust (other
                                 than funds on deposit
                                        6
<PAGE>   23
 
                                 in respect of the Class A-2 or Class A-3
                                 Investor Certificates), and (b) the Class A-4
                                 Investor Certificate, each Related 1990
                                 Certificate, any Subsequent 1990 Trust Investor
                                 Certificate and the 1990 Trust Seller
                                 Certificate will automatically be canceled, and
                                 all rights of the Master Trust with respect to
                                 such certificates will terminate. As of the
                                 1990 Trust Termination Date, funds on deposit
                                 in the 1990 Trust Spread Account will be
                                 transferred to the Master Trust and allocated
                                 among the Offered Series and any other
                                 outstanding Series that so provides based on
                                 the projected spread for each such Series
                                 (including the Projected Spread for the Offered
                                 Series). Any such funds allocated to the
                                 Offered Series will be deposited in the Spread
                                 Account for the benefit of the Offered
                                 Certificateholders. In addition, as of the 1990
                                 Trust Termination Date, 1990 Trust Investment
                                 Securities will be transferred to the Master
                                 Trust and deposited in the Excess Funding
                                 Account for the benefit of the Offered
                                 Certificateholders and the certificateholders
                                 of each other outstanding Series (such other
                                 certificateholders, together with the Offered
                                 Certificateholders, are referred to as the
                                 "Certificateholders"). Finally, as of the 1990
                                 Trust Termination Date, funds on deposit in the
                                 1990 Trust Interest Deposit Account will be
                                 transferred to the Master Trust and deposited
                                 in the Interest Deposit Account, subject to
                                 allocation and distribution as Finance Charge
                                 Collections to the extent provided herein.
                                 Thus, as of the 1990 Trust Termination Date and
                                 thereafter, the assets of the Master Trust will
                                 include (a) all Dealer Notes transferred to the
                                 Master Trust by the 1990 Trust and all Dealer
                                 Notes thereafter transferred to the Master
                                 Trust by the Seller, all monies due or to
                                 become due with respect thereto and all
                                 proceeds of such Dealer Notes, (b) the interest
                                 of the Seller in the security interests in the
                                 Financed Vehicles related to the Dealer Notes
                                 and the proceeds thereof, (c) the interest of
                                 the Seller in the Insurance Proceeds, (d) each
                                 Interest Rate Swap, interest rate cap, or other
                                 interest rate hedge, if any, that the Master
                                 Trust may have entered into or obtained for the
                                 benefit of any Series, and (e) all funds on
                                 deposit in certain accounts of the Master
                                 Trust, including funds on deposit in the Series
                                 Principal Account, the Distribution Account,
                                 the Spread Account, the Excess Funding Account,
                                 the Interest Deposit Account, the Negative
                                 Carry Reserve Fund and any other Series Account
                                 created under a Supplement to the Pooling and
                                 Servicing Agreement.
 
                                 On each business day (except in certain limited
                                 circumstances), NFC will sell Dealer Notes to
                                 the Seller and the Seller will transfer such
                                 Dealer Notes to the 1990 Trust, or after the
                                 1990 Trust Termination Date, the Master Trust
                                 (in either case, the "Active Trust") based on
                                 criteria provided in the 1990 Trust Agreement
                                 when the 1990 Trust is the Active Trust or the
                                 Pooling and Servicing Agreement when the Master
                                 Trust is the Active Trust (in either case, the
                                 "Applicable Agreement"). Accordingly, the
                                 aggregate amount of Dealer Notes in the Active
                                 Trust will fluctuate from day to day as new
                                 Dealer Notes are generated and as existing
                                 Dealer Notes are collected, charged off as
                                 uncollectible or otherwise adjusted or removed
                                 from the Active Trust.
                                        7
<PAGE>   24
 
DEALER NOTES..................   The Dealer Notes consist of wholesale notes
                                 issued by Dealers to finance new and used
                                 trucks and new and used trailers manufactured
                                 by or for NITC and other manufacturers. A
                                 Dealer Note is created upon shipment of, or
                                 upon receipt of an invoice with respect to,
                                 each new truck to such a Dealer or upon the
                                 purchase or acceptance in trade by such a
                                 Dealer of a used vehicle or trailer. NFC
                                 purchases Dealer Notes on a daily basis from
                                 NITC and from dealers. Currently, the Dealer
                                 Notes bear interest at a floating rate equal to
                                 the prime rate as announced from time to time
                                 by certain U.S. financial institutions plus a
                                 margin. See generally, "The Navistar Financial
                                 Dealer Floor Plan Financing Business."
 
                                 The Seller transfers Dealer Notes identified by
                                 the Servicer as Eligible Dealer Notes on a
                                 daily basis to the Servicer on behalf of the
                                 Active Trust (except in certain limited
                                 circumstances). Under certain circumstances,
                                 the Seller may be required to purchase (a) from
                                 the Active Trust (in which case NFC will be
                                 required to purchase from the Seller), those
                                 Dealer Notes previously transferred to the
                                 Active Trust that were not Eligible Dealer
                                 Notes as of the date of transfer to the Active
                                 Trust or (b) from the holders thereof (in which
                                 case NFC will be required to purchase from the
                                 Seller), all outstanding classes of 1990 Trust
                                 Investor Certificates or the
                                 Certificateholders' Interest in the Master
                                 Trust, as the case may be, if a material amount
                                 of Dealer Notes were not Eligible Dealer Notes
                                 as of the date of transfer to the Master Trust.
                                 If the Related 1990 Certificate is purchased
                                 from the Master Trust, an Investment Event or
                                 Early Amortization Event will occur and amounts
                                 received in respect thereof (other than accrued
                                 1990 Trust Investor Certificate Interest) will
                                 be treated as Principal Collections. See
                                 "Description of the Offered Certificates --
                                 Certain Representations and Warranties;
                                 Ineligible Dealer Notes; Purchase of
                                 Certificateholders' Interest."
 
SERVICING THE DEALER NOTES....   The Applicable Agreement authorizes NFC to
                                 service and administer the Dealer Notes on
                                 behalf of the Active Trust and the Seller and
                                 to collect payments due under the Dealer Notes
                                 in accordance with its customary and usual
                                 servicing procedures. Prior to the 1990 Trust
                                 Termination Date, the Servicer will be entitled
                                 to receive a fee payable in arrears equal to
                                 1.0% per annum of the daily average principal
                                 amount of Dealer Notes pursuant to the 1990
                                 Trust Agreement. After the 1990 Trust
                                 Termination Date, the Servicer will receive a
                                 servicing fee with respect to each outstanding
                                 Series, determined at the time of issuance of
                                 such Series. The servicing fee payable with
                                 respect to the Offered Series will be specified
                                 in the Prospectus Supplement.
 
OFFERED CERTIFICATES..........   The Offered Certificates on the date of their
                                 original issuance (with respect to the Offered
                                 Series, the "Closing Date") will be issued in
                                 minimum denominations of $1,000 and in integral
                                 multiples thereof. Prior to the 1990 Trust
                                 Termination Date, all amounts payable by the
                                 1990 Trust in respect of the Related 1990
                                 Certificate ("Related 1990 Certificate
                                 Collections") will be allocated to the Offered
                                 Series and amounts payable by the 1990 Trust in
                                 respect of any other 1990 Trust Investor
                                 Certificate issued in
                                        8
<PAGE>   25
 
                                 connection with the issuance of a Series will
                                 be allocated as provided in the Supplement
                                 related to the other Series. All allocations to
                                 the Offered Certificateholders, both prior to
                                 and after the 1990 Trust Termination Date, are
                                 referred to herein as the "Offered
                                 Certificateholders' Interest."
 
                                 The Offered Certificates will evidence an
                                 undivided beneficial interest in the assets of
                                 the Master Trust allocated to the Offered
                                 Certificateholders' Interest and will represent
                                 the right to receive from such assets funds up
                                 to (but not in excess of) the amounts required
                                 to make monthly payments of interest on the
                                 Invested Amount at the Offered Certificate Rate
                                 ("Monthly Interest") and to make the payment of
                                 principal on the Expected Payment Date (or
                                 earlier or later under certain circumstances)
                                 in an amount not to exceed the Invested Amount.
                                 Prior to the 1990 Trust Termination Date,
                                 Related 1990 Certificate Collections,
                                 Investment Income and any Net Swap Receipts
                                 will be the sole source used to fund payments
                                 due in respect of the Offered Certificates
                                 (including, to the extent described herein,
                                 Monthly Interest and Net Swap Payments), and
                                 any other amounts received by the Master Trust
                                 will be allocated to the Seller or to other
                                 outstanding Series.
 
                                 The principal amount of the Master Trust
                                 Seller's Interest will fluctuate (a) prior to
                                 the 1990 Trust Termination Date, based on
                                 changes in the size of the 1990 Trust Seller
                                 Interest, (b) based on changes in the
                                 outstanding principal amount of any variable
                                 funding certificate issued by the Master Trust,
                                 (c) after the 1990 Trust Termination Date, as
                                 the aggregate principal amount of the Dealer
                                 Notes in the Master Trust changes from time to
                                 time and (d) as new Series are issued and as
                                 outstanding Series amortize.
 
                                 The Offered Certificates will represent
                                 beneficial interests in the Master Trust only
                                 and will not represent interests in or
                                 obligations of NFC, the Seller or the 1990
                                 Trust. Neither the Offered Certificates nor the
                                 Dealer Notes are insured or guaranteed by NFC
                                 or the Seller or any affiliate thereof or by
                                 any governmental agency.
 
REGISTRATION OF THE
OFFERED CERTIFICATES..........   The Offered Certificates will initially be
                                 represented by one or more certificates
                                 registered in the name of Cede, as the nominee
                                 of DTC. No person acquiring an interest in the
                                 Offered Certificates will be entitled to
                                 receive a Definitive Certificate representing
                                 such person's interest unless Definitive
                                 Certificates are issued under the limited
                                 circumstances described herein. See
                                 "Description of the Offered Certificates --
                                 Definitive Certificates."
 
ISSUANCE OF NEW SERIES........   The Pooling and Servicing Agreement provides
                                 that, pursuant to any one or more supplements
                                 thereto (each, a "Supplement"), the Seller may
                                 cause the Master Trust Trustee to issue one or
                                 more new Series of certificates (a "New
                                 Issuance"). The Pooling and Servicing Agreement
                                 also provides that the Seller may specify with
                                 respect to any Series, among other things, the
                                 Principal Terms of such Series. Such Series may
                                 have the benefit of letters of credit, surety
                                 bonds, cash collateral accounts, collateral
                                 invested amounts,
                                        9
<PAGE>   26
 
                                 spread accounts, guaranteed rate agreements,
                                 liquidity facilities, interest rate swap
                                 agreements or other similar arrangements. The
                                 Seller may offer any Series to the public under
                                 a prospectus in transactions registered under
                                 the Securities Act or to other investors
                                 pursuant to other disclosure documents in
                                 private placements and other transactions
                                 exempt from registration under the Securities
                                 Act, in each case directly or through one or
                                 more underwriters or placement agents. The
                                 Master Trust Trustee and the Servicer do not
                                 expect to file periodic reports with the
                                 Commission or otherwise publicize the issuance
                                 of a Series exempt from registration under the
                                 Securities Act. See "Risk Factors -- Potential
                                 Adverse Impact of Issuance of Additional
                                 Series" for a discussion of the impact that a
                                 New Issuance may have on the Offered Series.
 
                                 Under the Pooling and Servicing Agreement and
                                 pursuant to a Supplement, a New Issuance may
                                 only occur upon delivery to the Master Trust
                                 Trustee of, among other things, the following:
                                 (a) a Supplement specifying the Principal
                                 Terms, (b) a Tax Opinion and (c) evidence of
                                 satisfaction of the Rating Agency Condition.
                                 The Pooling and Servicing Agreement further
                                 provides that, if the Seller effects a New
                                 Issuance prior to the 1990 Trust Termination
                                 Date, the Master Trust Trustee will, to the
                                 extent requested by the Seller but without any
                                 further action by the Seller or any
                                 Certificateholder, deliver the 1990 Trust
                                 Seller Certificate to the 1990 Trust Trustee
                                 prior to such New Issuance in exchange for one
                                 or more 1990 Trust Investor Certificates and a
                                 newly issued 1990 Trust Seller Certificate. See
                                 "Description of the Offered Certificates -- New
                                 Issuances."
 
INTEREST......................   Monthly Interest on the Offered Certificates
                                 will accrue at the Offered Certificate Rate and
                                 will be paid on the twenty-fifth day of each
                                 month, or if such twenty-fifth day is not a
                                 business day, the next business day thereafter.
                                 Monthly Interest will accrue from the most
                                 recent Distribution Date on which interest has
                                 been paid (or, with respect to the initial
                                 Distribution Date, the Closing Date) to but
                                 excluding the current Distribution Date on the
                                 Invested Amount at a per annum rate equal to
                                 the Offered Certificate Rate. Monthly Interest
                                 for any Distribution Date due but not paid on
                                 such Distribution Date will be due on the next
                                 Distribution Date.
 
                                 Prior to the 1990 Trust Termination Date and
                                 prior to the commencement of a Class
                                 Amortization Period for the Related 1990
                                 Certificate, to the extent described herein,
                                 the Related 1990 Certificate Interest
                                 Collections and any Net Swap Receipts, together
                                 with Investment Income, will be used to make
                                 payments when due of Monthly Interest to the
                                 Offered Certificateholders and Net Swap
                                 Payments to any Swap Counterparty. Upon the
                                 commencement, if any, of a Class Amortization
                                 Period for the Related 1990 Certificate,
                                 Monthly Interest will be funded from (a)
                                 Related 1990 Certificate Interest Collections,
                                 Investment Income, any Net Swap Receipts and
                                 any other amounts on deposit in the
                                 Distribution Account and (b) amounts on deposit
                                 in the Negative Carry Reserve Fund.
                                       10
<PAGE>   27
 
                                 After the 1990 Trust Termination Date, Offered
                                 Series Finance Charge Collections, Investment
                                 Income, any Net Swap Receipts and certain other
                                 amounts, to the extent described herein, will
                                 be used to make payments of Monthly Interest to
                                 the Offered Certificateholders and any Net Swap
                                 Payments to a Swap Counterparty. Under certain
                                 circumstances, Monthly Interest and any Net
                                 Swap Payments will be funded from withdrawals
                                 from the Spread Account, withdrawals from the
                                 Negative Carry Reserve Fund, withdrawals from
                                 the Liquidity Reserve Account and Available
                                 Seller's Finance Charge Collections to the
                                 extent described herein.
 
PRINCIPAL.....................   Although the final payment of principal with
                                 respect to the Offered Certificates is expected
                                 to be made on the Expected Payment Date, such
                                 final principal payment may be made earlier if
                                 an Early Amortization Event occurs or an Early
                                 Distribution election is made in connection
                                 with an Investment Event (see "Investment
                                 Period" below), or later under certain
                                 circumstances described herein. Unless an Early
                                 Amortization Event occurs or an Early
                                 Distribution election is made in connection
                                 with an Investment Event, it is expected that
                                 principal will be paid in one lump sum on the
                                 Expected Payment Date. If an Early Amortization
                                 Event occurs, an Early Amortization Period will
                                 commence, and (unless otherwise provided in the
                                 Prospectus Supplement) principal will be paid
                                 to the Offered Certificateholders on each
                                 Distribution Date thereafter beginning with the
                                 first Distribution Period following the Due
                                 Period in which such Early Amortization Period
                                 commences. Principal payments (if any) prior to
                                 the 1990 Trust Termination Date will be funded
                                 out of Related 1990 Certificate Principal
                                 Collections. After the 1990 Trust Termination
                                 Date, principal payments will be funded from
                                 Principal Collections allocated to the Offered
                                 Series in the manner set forth herein. See
                                 "Risk Factors -- Delays or Reductions in
                                 Payments Due to Insolvency."
 
ALLOCATIONS PRIOR TO THE 1990
TRUST TERMINATION DATE........   Prior to the 1990 Trust Termination Date, the
                                 assets of the Master Trust will be allocated to
                                 the Offered Certificateholders' Interest as
                                 described below.
 
                                 Related 1990 Certificate Collections,
                                 Investment Income and any Net Swap Receipts
                                 will be allocated to the Offered
                                 Certificateholders' Interest (but only to the
                                 extent necessary to make payments in respect of
                                 the Offered Certificates and any Interest Rate
                                 Swap) or paid to the Seller. Related 1990
                                 Certificate Interest Collections and any Net
                                 Swap Receipts will be deposited in the
                                 Distribution Account and, together with
                                 Investment Income, distributed to the Offered
                                 Certificateholders and any Swap Counterparty to
                                 the extent necessary to make payments on the
                                 Offered Certificates and any Net Swap Payments
                                 as provided herein. Unless an Investment Event
                                 or an Early Amortization Event occurs prior to
                                 the 1990 Trust Termination Date, no principal
                                 distributions will be made on any Related 1990
                                 Certificate. During an Investment Period or an
                                 Early Amortization Period, Related 1990
                                 Certificate Principal Collections will be
                                 allocated pro rata between the Series Principal
                                 Account to the extent of the
                                       11
<PAGE>   28
 
                                 Invested Amount and the Negative Carry Reserve
                                 Fund to the extent of the Negative Carry
                                 Reserve Fund Deposit Amount. Any remaining
                                 Related 1990 Certificate Principal Collections
                                 shall be paid to the Seller. Except for such
                                 subordinated right to receive remaining Related
                                 1990 Certificate Principal Collections prior to
                                 the 1990 Trust Termination Date, the Master
                                 Trust Seller's Interest is not subordinated to
                                 the Offered Certificateholders' Interest. All
                                 distributions and other payments made to the
                                 Master Trust as assignee of the Seller's rights
                                 under the 1990 Trust Agreement or as holder of
                                 the 1990 Trust Seller Certificate (the "1990
                                 Trust Seller Collections") will be allocated
                                 between any variable funding certificate issued
                                 by the Master Trust and the Seller (or as
                                 otherwise provided in any Supplement). If any
                                 new class of 1990 Trust Investor Certificates
                                 is issued under the 1990 Trust to the Master
                                 Trust in respect of the issuance of any new
                                 Series by the Master Trust, then any payment to
                                 the Master Trust with respect to such class
                                 will be allocated as provided in the Supplement
                                 related to the issuance of such Series.
 
ALLOCATIONS AFTER THE 1990
TRUST
TERMINATION DATE..............   After the 1990 Trust Termination Date, Finance
                                 Charge Collections, Principal Collections and
                                 Dealer Note Losses will be allocated to the
                                 Offered Series based on the Series Allocation
                                 Percentage. Finance Charge Collections,
                                 Principal Collections and Dealer Note Losses
                                 not allocated to the Offered Series will be
                                 allocated to other outstanding Series. Series
                                 Allocable Finance Charge Collections, Series
                                 Allocable Principal Collections and Series
                                 Allocable Dealer Note Losses will be further
                                 allocated between the Offered
                                 Certificateholders' Interest and the Master
                                 Trust Seller's Interest. In addition, after the
                                 1990 Trust Termination Date, a portion of the
                                 Master Trust Seller's Interest will be
                                 subordinated to the Offered Certificateholders'
                                 Interest under certain circumstances summarized
                                 below in "-- Subordination of the Master Trust
                                 Seller's Interest."
 
                                 Series Allocable Finance Charge Collections and
                                 Series Allocable Dealer Note Losses will be
                                 allocated at all times to the Offered
                                 Certificateholders' Interest based on the
                                 Floating Allocation Percentage. Investment
                                 Income will be allocated entirely to the
                                 Offered Certificateholders' Interest at all
                                 times. Any Series Allocable Finance Charge
                                 Collections and Investment Income allocated to
                                 the Offered Certificateholders' Interest and
                                 not needed to pay the Offered Series Servicing
                                 Fee, Monthly Interest and Net Swap Payments nor
                                 applied in certain other ways may be
                                 reallocated to other Series to the extent of
                                 any shortfalls and otherwise will be allocated
                                 to the Seller.
 
                                 During the Revolving Period, Series Allocable
                                 Principal Collections will be allocated to the
                                 Offered Certificateholders' Interest based on
                                 the Floating Allocation Percentage. During the
                                 Revolving Period, Offered Series Principal
                                 Collections will be available for reallocation
                                 to other Series that so provide and that are in
                                 amortization, early amortization or
                                 accumulation periods to the extent necessary to
                                 cover any principal shortfalls with respect
                                 thereto.
                                       12
<PAGE>   29
 
                                 Otherwise, Offered Series Principal Collections
                                 generally will be allocated to any variable
                                 funding certificate issued by the Master Trust
                                 or paid to the Seller during the Revolving
                                 Period or, to the extent described herein,
                                 allocated to and deposited in the Excess
                                 Funding Account in order to maintain the Master
                                 Trust Seller's Interest at a level equal to the
                                 Master Trust Minimum Seller's Interest. The
                                 purpose of the Excess Funding Account is to
                                 hold Principal Collections that would otherwise
                                 be paid to the Seller in order to maintain the
                                 Master Trust Seller's Interest at a level equal
                                 to the Minimum Master Trust Seller's Interest.
                                 Any amounts on deposit in the Excess Funding
                                 Account will be invested in Eligible
                                 Investments.
 
                                 During an Accumulation Period, Investment
                                 Period or Early Amortization Period, Series
                                 Allocable Principal Collections will be
                                 allocated to the Offered Certificateholders'
                                 Interest based on the Principal Allocation
                                 Percentage and, together with any shared
                                 principal collections from other Series
                                 allocable to the Offered Series, deposited in
                                 the Series Principal Account (subject to
                                 certain limitations). In addition, during the
                                 Accumulation Period (unless an Investment Event
                                 or an Early Amortization Event shall have
                                 occurred), deposits of principal to the Series
                                 Principal Account will not exceed the
                                 Controlled Deposit Amount and, subject to
                                 certain limitations, any Offered Series
                                 Principal Collections in excess of the
                                 Controlled Deposit Amount will be paid to the
                                 Seller or allocated to other Series that so
                                 provide. See "Description of the Offered
                                 Certificates -- Principal."
 
REVOLVING PERIOD..............   During the period commencing immediately
                                 following the 1990 Trust Termination Date and
                                 ending upon the commencement of the first to
                                 occur of the Accumulation Period, any
                                 Investment Period, or any Early Amortization
                                 Period (the "Revolving Period"), Series
                                 Allocable Principal Collections are effectively
                                 reinvested in the Master Trust to enable
                                 Investor Certificateholders to invest in the
                                 Master Trust for a period that is expected to
                                 exceed substantially the average maturity of
                                 the Dealer Notes. Unless an Investment Period
                                 or an Early Amortization Period is occurring,
                                 the Revolving Period will begin on the 1990
                                 Trust Termination Date and will end on the
                                 earliest of (a) the business day immediately
                                 preceding the Accumulation Period Commencement
                                 Date, (b) the business day immediately
                                 preceding the Investment Period Commencement
                                 Date and (c) the business day immediately
                                 preceding the Early Amortization Period
                                 Commencement Date. See "Description of the
                                 Offered Certificates -- Investment Events;
                                 -- Early Amortization Events" for a discussion
                                 of certain events that might lead to the
                                 termination of the Revolving Period in advance
                                 of the Accumulation Period Commencement Date.
 
SHARED SELLER PRINCIPAL
COLLECTIONS...................   During the Revolving Period, Shared Seller
                                 Principal Collections will be allocated among
                                 any other Series that provide for shared seller
                                 principal collections in respect of principal
                                 shortfalls before being allocated to the Excess
                                 Funding Account, if necessary, or paid to the
                                 Seller. During the Accumulation Period, Shared
                                 Seller Principal Collections and any shared
                                 seller principal collections for
                                       13
<PAGE>   30
 
                                 any other Series that provide for shared seller
                                 principal collections will be allocated among
                                 an Offered Series to the extent of any
                                 Accumulation Period Principal Shortfall and
                                 each other series that provides for the use of
                                 shared seller principal collections in respect
                                 of principal shortfalls before being allocated
                                 to the Excess Funding Account, if necessary, or
                                 paid to the Seller. There will be no Shared
                                 Seller Principal Collections during any
                                 Investment Period or Early Amortization Period.
 
INVESTMENT PERIOD.............   The Prospectus Supplement for the Offered
                                 Series will specify whether the terms of an
                                 Offered Series will include Investment Events
                                 and Investment Periods. Unless an Early
                                 Amortization Period commences, if an Investment
                                 Event occurs, the Offered Certificates will
                                 have an investment period (the "Investment
                                 Period") which will commence on the Investment
                                 Period Commencement Date and, except as
                                 described below, will continue until the
                                 earlier of (a) the commencement of an Early
                                 Amortization Period and (b) payment of the
                                 Invested Amount in full on the Expected Payment
                                 Date. During the Investment Period, Related
                                 1990 Certificate Principal Collections or
                                 Offered Series Principal Collections, as the
                                 case may be, and certain other amounts
                                 allocable to the Offered Certificateholders'
                                 Interest, will be deposited on each
                                 Distribution Date or business day,
                                 respectively, in the Series Principal Account
                                 and will be used to make principal
                                 distributions to the Offered Certificateholders
                                 on the Expected Payment Date or any Early
                                 Distribution Date. During an Investment Period,
                                 funds held in the Series Principal Account will
                                 be invested from time to time in Eligible
                                 Investments to avoid accelerating the repayment
                                 of the Invested Amount. The amount to be
                                 deposited in the Series Principal Account on
                                 any Distribution Date during the Investment
                                 Period will not be limited to any Controlled
                                 Deposit Amount.
 
                                 Beginning on the Distribution Date falling in
                                 an Investment Period on which the amount on
                                 deposit in the Series Principal Account equals
                                 the Invested Amount and the cumulative amount
                                 on deposit in the Negative Carry Reserve Fund
                                 (excluding any investment earnings) equals the
                                 Negative Carry Reserve Fund Required Amount
                                 (without giving effect to clause (b) in the
                                 definition thereof) (the "Fully Funded Date"),
                                 the Offered Certificateholders will no longer
                                 have any interest in the Related 1990
                                 Certificate or the Dealer Notes, as the case
                                 may be, and all the representations and
                                 covenants of the Seller and the Servicer
                                 relating to the Related 1990 Certificate or the
                                 Dealer Notes, as well as certain other
                                 provisions of the Pooling and Servicing
                                 Agreement and all remedies for breaches
                                 thereof, will no longer accrue to the benefit
                                 of the Offered Certificateholders. On and after
                                 the Fully Funded Date, the Offered
                                 Certificateholders will instead have an
                                 interest in the funds on deposit in the Series
                                 Principal Account, the Distribution Account and
                                 the Negative Carry Reserve Fund, Investment
                                 Income on all such funds, the Interest Rate
                                 Swap and Net Swap Receipts. In addition, upon
                                 the occurrence of the Fully Funded Date, no
                                 Related 1990 Certificate Collections, Finance
                                 Charge Collections, Principal Collections or
                                 Dealer Note Losses will be allocated to the
                                 Offered Series and, if
                                       14
<PAGE>   31
 
                                 the final distribution has been made with
                                 respect to each other Series or the fully
                                 funded date has occurred with respect thereto,
                                 all right, title and interest in and to any
                                 1990 Trust Investor Certificates issued to the
                                 Master Trust and the Dealer Notes will be
                                 conveyed and transferred to the Seller. See
                                 "Description of the Offered
                                 Certificates -- Termination; Fully Funded
                                 Date."
 
                                 During an Investment Period, the amount of
                                 funds available to pay Monthly Interest and Net
                                 Swap Payments may (before application of the
                                 Negative Carry Reserve Fund) be less than
                                 during the Revolving Period, because funds on
                                 deposit in the Series Principal Account are
                                 expected to earn interest at a lower rate than
                                 the rate payable on the Dealer Notes. As a
                                 result, the Negative Carry Reserve Fund is
                                 designed to provide an additional source of
                                 funds for the payment of Monthly Interest and
                                 Net Swap Payments.
 
                                 In connection with the issuance of the Offered
                                 Certificates, the Prospectus Supplement may
                                 provide for Early Distributions of principal to
                                 certain Offered Certificateholders on the Early
                                 Distribution Date. In such case, the terms
                                 "Early Distribution," "Early Distribution
                                 Amount" and "Early Distribution Date" will be
                                 defined in the Prospectus Supplement. If the
                                 Prospectus Supplement does not provide for
                                 Early Distributions, such terms will not be
                                 operative.
 
ACCUMULATION PERIOD...........   Unless an Investment Period or an Early
                                 Amortization Period commences and unless
                                 otherwise specified in the Prospectus
                                 Supplement with respect to the Offered Series,
                                 the Offered Certificates will have an
                                 accumulation period (the "Accumulation
                                 Period"), which allows for the accumulation of
                                 principal in the Series Principal Account in
                                 anticipation of a lump sum payment on the
                                 Expected Payment Date, and which will commence
                                 on the Accumulation Period Commencement Date
                                 and continue until the earliest of (a) the
                                 commencement of an Investment Period, (b) the
                                 commencement of an Early Amortization Period
                                 and (c) payment of the Invested Amount in full.
                                 During the Accumulation Period, Offered Series
                                 Principal Collections and certain other amounts
                                 allocable to the Offered Certificateholders'
                                 Interest will be deposited on each business day
                                 in an Eligible Deposit Account under the Master
                                 Trust (the "Series Principal Account") and will
                                 be used to make principal distributions to the
                                 Offered Certificateholders when due. The
                                 cumulative amount to be deposited in the Series
                                 Principal Account for any Due Period during the
                                 Accumulation Period will be limited to an
                                 amount equal to the Controlled Deposit Amount.
 
                                 On or prior to the Distribution Date which is
                                 ten months prior to the Expected Payment Date,
                                 the Servicer will determine the number of Due
                                 Periods in the Accumulation Period (the
                                 "Accumulation Period Length") and the day on
                                 which the Accumulation Period commences (the
                                 "Accumulation Period Commencement Date"), which
                                 will be the first day of a Due Period.
                                 Notwithstanding the foregoing, the Accumulation
                                 Period Commencement Date will be the "Specified
                                 Accumulation Period Commencement Date" (which
                                 will be set forth in the Prospectus
                                       15
<PAGE>   32
 
                                 Supplement) if, prior to such date, any other
                                 outstanding Series shall have entered into an
                                 investment period or an early amortization
                                 period. In addition, if the Accumulation Period
                                 Length and the Accumulation Period Commencement
                                 Date have been determined but the Accumulation
                                 Period has not commenced and any other
                                 outstanding Series enters into an investment
                                 period or an early amortization period, the
                                 Accumulation Period Commencement Date will be
                                 the date that such outstanding Series has
                                 entered into its investment period or early
                                 amortization period.
 
                                 Other Series issued by the Master Trust may
                                 have either an accumulation period or an
                                 amortization period. Such accumulation periods
                                 or amortization periods may have different
                                 lengths and begin on different dates. Thus,
                                 certain Series may be in their revolving
                                 periods, while others are in periods during
                                 which Principal Collections are distributed to,
                                 or reserved for, such Series.
 
EARLY AMORTIZATION PERIOD.....   The Prospectus Supplement for an Offered Series
                                 will specify that the Pooling and Servicing
                                 Agreement requires the accelerated repayment of
                                 principal (to the extent of Related 1990
                                 Certificate Principal Collections or Offered
                                 Series Principal Collections, as the case may
                                 be) during the Early Amortization Period, which
                                 commences upon the occurrence of an Early
                                 Amortization Event. Therefore, if an Early
                                 Amortization Period commences prior to the 1990
                                 Trust Termination Date, Related 1990
                                 Certificate Principal Collections will (unless
                                 otherwise provided in the Prospectus
                                 Supplement) be distributed to the Offered
                                 Certificateholders monthly on each Distribution
                                 Date beginning with the Distribution Date
                                 following the Due Period in which such Early
                                 Amortization Period commences.
 
                                 If an Early Amortization Period commences after
                                 the 1990 Trust Termination Date, then the
                                 Revolving Period, the Investment Period or the
                                 Accumulation Period, as applicable, will
                                 terminate, and Offered Series Principal
                                 Collections and certain other amounts allocable
                                 to the Offered Certificateholders' Interest
                                 will no longer be paid to the Seller or the
                                 holders of any other outstanding Series or
                                 retained in the Excess Funding Account but
                                 instead will (unless otherwise specified in the
                                 Prospectus Supplement) be distributed to the
                                 Offered Certificateholders monthly on each
                                 Distribution Date beginning with the
                                 Distribution Date following the Due Period in
                                 which an Early Amortization Period commences.
 
                                 During an Early Amortization Period,
                                 distributions of principal on the Offered
                                 Certificates will not be subject to the
                                 Controlled Deposit Amount. See "Description of
                                 the Offered Certificates -- Distributions to
                                 Offered Certificateholders and the Swap
                                 Counterparty; -- Principal." In addition
                                 (unless otherwise provided in the Prospectus
                                 Supplement), on the Distribution Date following
                                 the first Due Period occurring during an Early
                                 Amortization Period, any amounts on deposit in
                                 the Series Principal Account and amounts on
                                 deposit in the Excess Funding Account that are
                                 allocable to the Offered Series (based on the
                                 Series Allocation Percentage for the Offered
                                 Series) will be paid to the Offered
                                 Certificateholders up to the Invested Amount.
                                 See "Description of
                                       16
<PAGE>   33
 
                                 the Offered Certificates -- Distributions to
                                 Offered Certificateholders and the Swap
                                 Counterparty." No Investment Period may
                                 commence during an Early Amortization Period.
 
NEGATIVE CARRY RESERVE FUND...   The Prospectus Supplement for the Offered
                                 Series will specify whether the terms of the
                                 Offered Series will include a Negative Carry
                                 Reserve Fund, Negative Carry Reserve Fund
                                 Deposit Amount, Negative Carry Reserve Fund
                                 Required Amount or Negative Carry Subordinated
                                 Amount. The Negative Carry Reserve Fund
                                 provides an additional source of funds to make
                                 Monthly Interest payments and Net Swap Payments
                                 during an Investment Period, Early Amortization
                                 Period or Accumulation Period and in limited
                                 instances to fund the Liquidity Reserve Account
                                 and to make principal payments with respect to
                                 the Offered Certificates. Therefore, if, during
                                 any Investment Period, Early Amortization
                                 Period or Accumulation Period, Related 1990
                                 Certificate Interest Collections (if any),
                                 Investment Income, Offered Series Finance
                                 Charge Collections (if any), Net Swap Receipts
                                 and, after the 1990 Trust Termination Date,
                                 excess interest collections from other Series
                                 allocable to the Offered Series and certain
                                 amounts otherwise attributable to the Seller
                                 are not sufficient to pay Monthly Interest and
                                 Net Swap Payments, the Master Trust Trustee
                                 shall, after applying funds from the Spread
                                 Account (if any) and, during an Early
                                 Amortization Period or Investment Period, the
                                 Liquidity Reserve Account, withdraw funds from
                                 the Negative Carry Reserve Fund up to the
                                 amount of such respective insufficiencies, to
                                 make payments of Monthly Interest and Net Swap
                                 Payments pro rata based on their respective
                                 amounts. The Negative Carry Reserve Fund will
                                 be funded (a) prior to the 1990 Trust
                                 Termination Date (but only after an Investment
                                 Event or Early Amortization Event has
                                 occurred), from Related 1990 Certificate
                                 Collections, and (b) after the 1990 Trust
                                 Termination Date (after the occurrence of an
                                 Investment Event or an Early Amortization Event
                                 or during the Accumulation Period), from
                                 Available Seller's Finance Charge Collections
                                 and Available Seller's Principal Collections,
                                 in each case to the extent of the Negative
                                 Carry Reserve Fund Deposit Amount.
 
SPREAD ACCOUNT................   As of the 1990 Trust Termination Date, the
                                 Master Trust Trustee will establish and
                                 maintain an Eligible Deposit Account under the
                                 Master Trust for the benefit of the Offered
                                 Certificateholders (the "Spread Account"),
                                 which is intended to provide an additional
                                 source of funds for the payment of Monthly
                                 Interest, Net Swap Payments, the Offered Series
                                 Servicing Fee and certain other deficiencies
                                 and losses on the Dealer Notes and in limited
                                 instances to fund the Liquidity Reserve Account
                                 and to make principal payments with respect to
                                 the Offered Certificates. The Spread Account
                                 will be funded initially in an amount up to the
                                 Projected Spread with funds transferred from
                                 the 1990 Trust Spread Account and allocated to
                                 the Offered Certificates and from funds
                                 otherwise allocable to the Seller. Generally,
                                 on any Transfer Date, the funds on deposit will
                                 be increased if the sum of Monthly Interest,
                                 Net Swap Payments and the Offered Series
                                 Servicing Fee, in each case as projected for
                                 the following Distribution Period, exceeds the
                                       17
<PAGE>   34
 
                                 amount of the Master Trust's projected income
                                 for the related Due Period which is allocable
                                 to the Offered Series based on the Series
                                 Allocation Percentage. On any Transfer Date
                                 occurring prior to or on the Fully Funded Date
                                 but after the 1990 Trust Termination Date on
                                 which the Offered Series Finance Charge
                                 Collections, Investment Income, Net Swap
                                 Receipts, and certain amounts otherwise
                                 attributable to the Seller as described herein
                                 are not sufficient to pay the Offered Series
                                 Servicing Fee, Monthly Interest and the Net
                                 Swap Payment (including any previously due but
                                 unpaid Monthly Interest and Net Swap Payments,
                                 and interest thereon) and to cover Offered
                                 Series Dealer Note Losses and unreimbursed
                                 Certificateholder Charge-Offs, the amount on
                                 deposit in the Spread Account on such Transfer
                                 Date shall be applied by the Master Trust
                                 Trustee up to the amount of such insufficiency
                                 to make such payments in the order and priority
                                 described herein, subject to certain
                                 limitations described herein. The amount
                                 required to be maintained in the Spread Account
                                 may be reduced upon satisfaction of the Rating
                                 Agency Condition. The Spread Account is not
                                 required to be funded after the Fully Funded
                                 Date.
 
                                 Prior to the 1990 Trust Termination Date, the
                                 1990 Trust Spread Account will be available to
                                 satisfy shortfalls of interest on the Related
                                 1990 Certificate and the other outstanding 1990
                                 Trust Investor Certificates. The 1990 Trust
                                 Spread Account is required to be funded at all
                                 times with an amount equal to at least 1.25% of
                                 the result of the aggregate outstanding
                                 principal amount of all 1990 Trust Investor
                                 Certificates minus unreimbursed charge-offs and
                                 losses on investments of principal payable to
                                 the holders of 1990 Trust Investor
                                 Certificates. The funds on deposit in the 1990
                                 Trust Spread Account are required to be
                                 increased to the extent that the sum of
                                 projected interest on the 1990 Trust Investor
                                 Certificates and projected fees of the Servicer
                                 exceeds the 1990 Trust's projected income for
                                 the related Due Period.
 
SUBORDINATION OF THE MASTER
TRUST SELLER'S INTEREST.......   Prior to the 1990 Trust Termination Date, all
                                 subordination in respect of the Offered
                                 Certificates will be provided by the 1990 Trust
                                 Available Subordinated Amount under the 1990
                                 Trust Agreement, and the Master Trust Seller's
                                 Interest will not be subordinated to the
                                 Offered Certificateholders' Interest (except
                                 that the Seller will be entitled to receive
                                 Related 1990 Certificate Principal Collections
                                 only to the extent the Invested Amount and the
                                 Negative Carry Reserve Fund Deposit Amount have
                                 been provided for in full). The 1990 Trust
                                 Available Subordinated Amount generally is
                                 equal to 15.5% of the 1990 Trust Total Invested
                                 Amount, subject to certain reductions,
                                 reinstatements, floors and other limitations.
                                 See "Terms of the 1990 Trust Investor
                                 Certificates -- Limited Subordination of the
                                 1990 Trust Seller Interest; 1990 Trust
                                 Available Subordinated Amount."
 
                                 Beginning on the 1990 Trust Termination Date
                                 and thereafter until the Fully Funded Date, the
                                 right of the Seller to receive payments in
                                 respect of the Master Trust Seller's Interest
                                 will be subordinated to the interests of the
                                 Offered Certificateholders. Such subordina-
                                       18
<PAGE>   35
 
                                 tion is limited to the Available Subordinated
                                 Amount, plus, following the commencement of the
                                 Accumulation Period, any Investment Period or
                                 any Early Amortization Period, the Negative
                                 Carry Subordinated Amount. If Available
                                 Certificateholder Interest Collections and Net
                                 Swap Receipts are insufficient to cover the
                                 Offered Series Servicing Fee, accrued Monthly
                                 Interest, the Net Swap Payment, if any, and the
                                 Offered Series Dealer Note Losses, a limited
                                 portion of the Master Trust Seller's Interest
                                 will be available to make up such deficiency.
                                 If such portion is not sufficient, certain
                                 amounts in the Spread Account and, in certain
                                 circumstances, the Liquidity Reserve Account
                                 and the Negative Carry Reserve Fund, will also
                                 be available to cover such deficiency. See
                                 "Description of the Offered
                                 Certificates -- Allocation of Collections After
                                 the 1990 Trust Termination Date -- Limited
                                 Subordination of Master Trust Seller's
                                 Interest; Spread Account; Liquidity Reserve
                                 Account."
 
                                 The "Available Subordinated Amount" for the
                                 Offered Series on the Transfer Date related to
                                 the first Due Period commencing after the 1990
                                 Trust Termination Date will equal the product
                                 of the Invested Amount and the Subordinated
                                 Percentage (which will be set forth in the
                                 Prospectus Supplement). The Available
                                 Subordinated Amount for each Transfer Date
                                 thereafter will be reduced by amounts
                                 previously drawn from the Master Trust Seller's
                                 Interest and, subject to certain limitations,
                                 by reductions in the Invested Amount, and will
                                 be reinstated to the extent Available
                                 Certificateholder Interest Collections, Net
                                 Swap Receipts and Excess Interest Collections
                                 are paid to the Seller or, during any
                                 Investment Period or Early Amortization Period,
                                 deposited in the Liquidity Reserve Account (up
                                 to an amount equal to the Subordinated
                                 Percentage multiplied by the Invested Amount).
 
LIQUIDITY RESERVE ACCOUNT.....   After the 1990 Trust Termination Date and prior
                                 to or on the commencement of an Investment
                                 Period or an Early Amortization Period, the
                                 Master Trust Trustee will establish (for the
                                 benefit of the Seller) an Eligible Deposit
                                 Account the purpose of which is to
                                 cash-collateralize the Available Subordinated
                                 Amount during an Investment Period or an Early
                                 Amortization Period (the "Liquidity Reserve
                                 Account"). In addition, in certain
                                 circumstances, the Liquidity Reserve Account
                                 provides an additional source of funds to make
                                 principal payments with respect to the Offered
                                 Certificates. Upon the commencement of an
                                 Investment Period or an Early Amortization
                                 Period, funds in the Spread Account will be
                                 deposited in the Liquidity Reserve Account.
                                 During an Investment Period or an Early
                                 Amortization Period, Available Seller's Finance
                                 Charge Collections and Available Seller's
                                 Principal Collections will be deposited in the
                                 Liquidity Reserve Account until such time as
                                 the amount on deposit is equal to the Available
                                 Subordinated Amount, in order to provide a
                                 source of funds for payments in respect
                                 thereof.
 
ADVANCES......................   For any Due Period, the Servicer will be
                                 required to make an Advance to the collections
                                 account under the Active Trust in an amount
                                 equal to all Dealer Finance Charges for such
                                 Due Period
                                       19
<PAGE>   36
 
                                 which have not been paid by the Transfer Date
                                 (other than the amount of Dealer Finance
                                 Charges that the Servicer determines will be
                                 uncollectible). Once any previously unpaid
                                 Dealer Finance Charges are paid on the Dealer
                                 Notes to which any portion of an Advance
                                 relates, or when the Servicer determines that
                                 it will be unable to recover such unpaid Dealer
                                 Finance Charges on the Dealer Notes to which
                                 the portion of the Advance relates, the
                                 Servicer will be reimbursed in an amount equal
                                 to such portion of the Advance.
 
INTEREST RATE SWAP............   In connection with the issuance of any Series
                                 of Offered Certificates, the Master Trust may
                                 enter into one or more interest rate swap
                                 agreements (each, an "Interest Rate Swap") with
                                 a Swap Counterparty with terms that will be
                                 more fully described in the Prospectus
                                 Supplement. If the Master Trust does enter into
                                 an Interest Rate Swap, all terms and provisions
                                 described herein relating to the Interest Rate
                                 Swap, including the defined terms "Swap
                                 Counterparty," "Swap Fixed Rate," "Swap
                                 Floating Rate," "Swap Receipt," "Swap Payment,"
                                 "Net Swap Receipt" and "Net Swap Payment," will
                                 apply and be operative. If the Master Trust
                                 Trustee does not enter into an Interest Rate
                                 Swap, such terms and provisions, as well as
                                 paragraphs (x) and (y) under "Description of
                                 the Offered Certificates -- Allocation of
                                 Collections After the 1990 Trust Termination
                                 Date -- Available Certificateholder Interest
                                 Collections," will not be operative (unless
                                 otherwise specified in the Prospectus
                                 Supplement). The Master Trust will likely not
                                 enter into an Interest Rate Swap in the event
                                 that the Offered Certificate Rate is a floating
                                 rate. The floating rate payable by the Master
                                 Trust in respect of an Interest Rate Swap or an
                                 Offered Series that bears interest at a
                                 floating rate, as applicable, is the
                                 "Applicable Floating Rate."
 
                                 In accordance with the terms of each Interest
                                 Rate Swap, the Swap Counterparty will be
                                 obligated to pay to the Master Trust, not later
                                 than each Distribution Date, interest at a rate
                                 per annum equal to the Swap Fixed Rate on the
                                 Invested Amount as of the preceding
                                 Distribution Date (after giving effect to all
                                 distributions on such date). In exchange for
                                 such payments, the Master Trust will be
                                 obligated to pay to the Swap Counterparty, on
                                 each Distribution Date, interest at a per annum
                                 rate equal to the Swap Floating Rate on the
                                 Invested Amount as of the preceding
                                 Distribution Date (after giving effect to all
                                 distributions on such date). With respect to
                                 each Distribution Date, the payment to the
                                 Master Trust by the Swap Counterparty will be
                                 referred to herein as the "Swap Receipt" and
                                 the payment by the Master Trust to the Swap
                                 Counterparty will be referred to herein as the
                                 "Swap Payment." Under the Interest Rate Swap,
                                 on each Distribution Date, the amount the
                                 Master Trust is obligated to pay will be netted
                                 against the amount the Swap Counterparty is
                                 obligated to pay such that only the net amount
                                 will be due from the Master Trust (referred to
                                 herein as the "Net Swap Payment") or from the
                                 Swap Counterparty (referred to herein as the
                                 "Net Swap Receipt"), as the case may be. Net
                                 Swap Receipts on any Distribution Date will be
                                 allocated and distributed in the same manner as
                                 Series Alloca-
                                       20
<PAGE>   37
 
                                 ble Finance Charge Collections on such
                                 Distribution Date, except as otherwise
                                 described herein. Net Swap Payments will be
                                 paid out of Related 1990 Certificate Interest
                                 Collections, Investment Income and, in certain
                                 circumstances, the Negative Carry Reserve Fund,
                                 prior to the 1990 Trust Termination Date, and
                                 thereafter out of Offered Series Finance Charge
                                 Collections, Investment Income, excess interest
                                 collections from other Series allocable to the
                                 Offered Series, withdrawals from the Spread
                                 Account, withdrawals from the Negative Carry
                                 Reserve Fund, withdrawals from the Liquidity
                                 Reserve Account and Available Seller's Finance
                                 Charge Collections to the extent described
                                 herein. Net Swap Payments and Monthly Interest
                                 will be paid on a pari passu basis, as
                                 described under "Description of the Offered
                                 Certificates -- Allocations of Collections
                                 After the 1990 Trust Termination Date."
 
THE 1990 TRUST................   The 1990 Trust was formed pursuant to a Pooling
                                 and Servicing Agreement, dated as of December
                                 1, 1990, among NFC, as Servicer, NFSC, as
                                 Seller, and The Chase Manhattan Bank, as
                                 trustee (the "1990 Trust Trustee"), as
                                 supplemented by the supplement relating to the
                                 Related 1990 Certificate to be dated as of the
                                 Closing Date among NFC, as Servicer, NFSC, as
                                 Seller, and the 1990 Trust Trustee and any
                                 other supplement relating to any other 1990
                                 Trust Investor Certificate (as so supplemented
                                 and as it has been or may be supplemented and
                                 amended, the "1990 Trust Agreement"). The
                                 property of the 1990 Trust includes all
                                 Eligible Dealer Notes previously and hereafter
                                 transferred to the 1990 Trust, all monies due
                                 or to become due with respect thereto and all
                                 proceeds of such Dealer Notes, the interest of
                                 the Seller in the security interests in the
                                 Financed Vehicles related to the Dealer Notes,
                                 the interest of the Seller in the Insurance
                                 Proceeds, the 1990 Trust Investment Securities
                                 and such funds as from time to time are
                                 deposited in the accounts created under the
                                 1990 Trust for the benefit of the holders of
                                 1990 Trust Investor Certificates.
 
RELATED 1990 CERTIFICATE......   The Related 1990 Certificate represents a
                                 fractional undivided interest in the 1990
                                 Trust. The Master Trust, as holder of the
                                 Related 1990 Certificate, will be entitled to
                                 receive (a) monthly payments of interest at a
                                 rate equal to the Related 1990 Certificate Rate
                                 (which will be set forth in the Prospectus
                                 Summary) and (b) payments of principal (to the
                                 extent of the unpaid Class Invested Amount for
                                 the Related 1990 Certificate), such principal
                                 payments beginning after the earlier of the
                                 Scheduled Class Amortization Date for the
                                 Related 1990 Certificate and the date on which
                                 a 1990 Trust Amortization Event occurs. The
                                 Class Invested Amount for the Related 1990
                                 Certificate will be equal to the Class Initial
                                 Invested Amount for the Related 1990
                                 Certificate less principal repayments,
                                 charge-offs and losses of principal on
                                 investments of funds on deposit in the
                                 Certificate Principal Account under the 1990
                                 Trust allocated to the Related 1990 Certificate
                                 which are not otherwise reimbursed. The
                                 aggregate interest in the assets of the 1990
                                 Trust represented by the Related 1990
                                 Certificate at any time will not exceed an
                                 amount equal to the Class Invested Amount for
                                 such class at such time plus accrued and unpaid
                                 interest thereon. The Related 1990 Certificate
                                 represents an
                                       21
<PAGE>   38
 
                                 interest in the 1990 Trust and does not
                                 represent an interest in or obligation of NFC
                                 or the Seller.
 
                                 As of the date hereof, the 1990 Trust has three
                                 other issued and outstanding classes of
                                 Investor Certificates: its Class A-2 Floating
                                 Rate Pass-Through Certificates (the "Class A-2
                                 Investor Certificates"), having an outstanding
                                 principal balance of $100,000,000, its Class
                                 A-3 Floating Rate Pass-Through Certificates
                                 (the "Class A-3 Investor Certificates"), having
                                 an outstanding principal balance of
                                 $100,000,000, and its Class A-4 Floating Rate
                                 Pass-Through Certificates (the "Class A-4
                                 Investor Certificate"), having an outstanding
                                 principal balance of $207,860,000. The Class
                                 A-2, Class A-3 and Class A-4 Investor
                                 Certificates and the Related 1990 Certificate,
                                 together with any other outstanding class of
                                 certificates issued under the 1990 Trust, are
                                 referred to as the "1990 Trust Investor
                                 Certificates." The 1990 Trust previously issued
                                 Class A-1 Floating Rate Pass-Through
                                 Certificates (the "Class A-1 Investor
                                 Certificates"), having an initial outstanding
                                 principal balance of $100,000,000, which have
                                 since been paid in full.
 
                                 The other principal terms of each of the
                                 Related 1990 Certificate, the Class A-2, Class
                                 A-3 and Class A-4 Investor Certificates, as
                                 well as any other class of 1990 Trust Investor
                                 Certificates issued to the Master Trust, will
                                 be set forth in the Prospectus Supplement.
 
                                 Interest on the Related 1990 Certificate will
                                 be paid on the twenty-fifth day of each month,
                                 or if such twenty-fifth day is not a business
                                 day, the next business day thereafter. Interest
                                 will accrue from the most recent Distribution
                                 Date on which interest has been paid to but
                                 excluding the current Distribution Date on the
                                 unpaid principal amount of the Related 1990
                                 Certificate at a floating per annum rate (the
                                 "Related 1990 Certificate Rate") equal to
                                 one-month LIBOR plus an amount which shall be
                                 specified in the Prospectus Supplement
                                 (calculated on the basis of a 360-day year of
                                 twelve 30-day months). Interest payments will
                                 be funded from that portion of Dealer Finance
                                 Charges, NITC Finance Charges and 1990 Trust
                                 Investment Income during the Due Period
                                 allocable to the Related 1990 Certificate
                                 (after making payments in respect of the 1990
                                 Trust Monthly Servicing Fee and Advance
                                 Reimbursements, if any). If such funds are
                                 insufficient to pay interest on the Related
                                 1990 Certificate, such interest payments will
                                 be paid from funds otherwise payable with
                                 respect to the 1990 Trust Seller Certificate,
                                 to the extent of the 1990 Trust Available
                                 Subordinated Amount.
 
                                 No principal payments will be made with respect
                                 to the Related 1990 Certificate during the 1990
                                 Trust Non-Amortization Period. Upon the
                                 occurrence of the Class Amortization Date for
                                 the Related 1990 Certificate, however, the
                                 holder of the Related 1990 Certificate will
                                 begin to receive monthly payments of principal
                                 in addition to interest. Once the Class
                                 Amortization Period has commenced for the
                                 Related 1990 Certificate, monthly payments of
                                 principal will begin on the Distribution Date
                                 related to the Due
                                       22
<PAGE>   39
 
                                 Period during which the Class Amortization Date
                                 for the Related 1990 Certificate occurred.
 
                                 The occurrence of a 1990 Trust Amortization
                                 Event is the only circumstance under which
                                 principal payments to each class of 1990 Trust
                                 Investor Certificates will commence prior to
                                 the Scheduled Class Amortization Date for each
                                 such class. If a 1990 Trust Amortization Event
                                 occurs, each outstanding class of 1990 Trust
                                 Investor Certificates will begin to receive
                                 payments of principal on the Distribution Date
                                 related to the Due Period during which the 1990
                                 Trust Amortization Event takes place. See
                                 "Terms of the 1990 Trust Investor
                                 Certificates -- 1990 Trust Amortization Events"
                                 for a discussion of events which constitute
                                 1990 Trust Amortization Events.
 
1990 TRUST SELLER
CERTIFICATE...................   The 1990 Trust Seller Certificate represents
                                 the fractional undivided interest in the 1990
                                 Trust not represented by the 1990 Trust
                                 Investor Certificates (the "1990 Trust Seller
                                 Interest"). The right of the holder of the 1990
                                 Trust Seller Certificate to receive payments in
                                 respect of the 1990 Trust Seller Interest is
                                 subordinated to the interests of the 1990 Trust
                                 Investor Certificates to the extent of the 1990
                                 Trust Available Subordinated Amount. As amounts
                                 are made available for the benefit of the 1990
                                 Trust Investor Certificates from the
                                 subordinated portion of the 1990 Trust Seller
                                 Interest, the 1990 Trust Available Subordinated
                                 Amount and, in certain circumstances, the 1990
                                 Trust Seller Interest, will be reduced. In
                                 subsequent Due Periods, the 1990 Trust
                                 Available Subordinated Amount may be reinstated
                                 by the amount of any payments of 1990 Trust
                                 Excess Servicing in respect of the 1990 Trust
                                 Seller Certificate. The amount of the 1990
                                 Trust Seller Interest must at all times equal
                                 or exceed the 1990 Trust Minimum Seller
                                 Interest. Since the date of the first issuance
                                 of 1990 Trust Investor Certificates, the 1990
                                 Trust Available Subordinated Amount has not
                                 been drawn upon, but there can be no assurance
                                 that it will not be drawn upon in the future.
 
                                 The 1990 Trust Agreement provides that, subject
                                 to certain conditions, the holder of the 1990
                                 Trust Seller Certificate may deliver the 1990
                                 Trust Seller Certificate to the 1990 Trust
                                 Trustee in exchange for (a) one or more newly
                                 issued classes of 1990 Trust Investor
                                 Certificates and (b) a reissued 1990 Trust
                                 Seller Certificate. The Master Trust, as holder
                                 of the 1990 Trust Seller Certificate, will
                                 effect such an exchange only in the event that
                                 the Seller effects a New Issuance under the
                                 Master Trust as described herein.
 
CREDIT ENHANCEMENT UNDER
THE 1990 TRUST................   Credit enhancement of the 1990 Trust Investor
                                 Certificates is afforded by the use of 1990
                                 Trust Excess Servicing and subordination of the
                                 1990 Trust Seller Interest to the extent of the
                                 1990 Trust Available Subordinated Amount. Such
                                 subordination is effected by payments from 1990
                                 Trust Seller Interest Income, the 1990 Trust
                                 Spread Account, the proceeds of 1990 Trust
                                 Invest-
                                       23
<PAGE>   40
 
                                 ment Securities and (during a 1990 Trust
                                 Amortization Term) the 1990 Trust Liquidity
                                 Reserve Account and by reductions in the 1990
                                 Trust Seller Interest. Credit enhancement of
                                 the 1990 Trust Investor Certificates will be
                                 limited at all times during the term of the
                                 1990 Trust to the sum of 1990 Trust Excess
                                 Servicing and the 1990 Trust Available
                                 Subordinated Amount. If at any time during the
                                 term of the 1990 Trust the 1990 Trust Available
                                 Subordinated Amount is reduced to zero, the
                                 holders of 1990 Trust Investor Certificates
                                 (including the Master Trust, as holder of the
                                 Related 1990 Certificate) will thereafter bear
                                 the credit and other risks associated with
                                 their fractional undivided interest in the 1990
                                 Trust directly without the benefit of any
                                 further credit enhancement other than 1990
                                 Trust Excess Servicing, if any. Prior to the
                                 1990 Trust Termination Date, Offered
                                 Certificates are dependent upon distributions
                                 by the 1990 Trust in respect of the Related
                                 1990 Certificate. Accordingly, if credit
                                 enhancement of the Related 1990 Certificate is
                                 insufficient, the Offered Certificateholders
                                 could suffer losses.
 
1990 TRUST EXCESS SERVICING...   "1990 Trust Excess Servicing" means on any
                                 Determination Date during the term of the 1990
                                 Trust the excess of 1990 Trust Interest Income
                                 over the sum of Advance Reimbursements, the
                                 1990 Trust Monthly Servicing Fee, 1990 Trust
                                 Investor Certificate Interest and notional
                                 interest on the 1990 Trust Seller Certificate
                                 (in each case, for the related Due Period or
                                 Distribution Period, as applicable). Any 1990
                                 Trust Excess Servicing which is not needed to
                                 offset losses is paid to the holder of the 1990
                                 Trust Seller Certificate. If the 1990 Trust
                                 Available Subordinated Amount has previously
                                 been reduced, it is reinstated up to an amount
                                 no greater than the 1990 Trust Maximum
                                 Subordinated Amount by certain payments of 1990
                                 Trust Excess Servicing to the holder of the
                                 1990 Trust Seller Certificate. Payments of 1990
                                 Trust Excess Servicing for the benefit of any
                                 class of 1990 Trust Investor Certificates will
                                 not reduce the 1990 Trust Available
                                 Subordinated Amount.
 
TAX STATUS....................   The Seller has received an opinion of Tax
                                 Counsel that under existing law the Offered
                                 Certificates will be treated as indebtedness
                                 for federal income tax purposes. Tax Counsel
                                 has also opined that similar treatment would
                                 apply for Illinois income tax purposes and New
                                 York income and corporate franchise tax
                                 purposes. Each Offered Certificateholder, by
                                 the acceptance of an Offered Certificate, will
                                 agree to treat the Offered Certificates as
                                 indebtedness for United States federal, state
                                 and local income and franchise tax purposes.
                                 See "Federal Income Tax Matters" and "Certain
                                 State Tax Matters."
 
ERISA CONSIDERATIONS..........   If the assets of the Master Trust are deemed to
                                 be "plan assets" of Offered Certificateholders,
                                 a Plan's ownership of the Offered Certificates
                                 might give rise to a prohibited transaction
                                 under ERISA and the Code. Unless certain
                                 conditions are satisfied, no assurances can be
                                 given that the assets of the Master Trust will
                                 not be deemed to be "plan assets." Regardless
                                 of whether or not the assets of the Master
                                 Trust are deemed to be "plan assets,"
                                       24
<PAGE>   41
 
                                 however, prior to purchasing Offered
                                 Certificates on behalf of a Plan, the Plan
                                 fiduciary should determine whether an
                                 investment in the Offered Certificates is
                                 permitted under the documents and instruments
                                 governing the Plan and should consult with
                                 counsel with respect to the potential
                                 consequences under ERISA and the Code of the
                                 Plan's acquisition and ownership of Offered
                                 Certificates. See "ERISA Considerations."
 
RATING OF THE OFFERED
CERTIFICATES..................   It is a condition of issuance that the Offered
                                 Certificates be rated in the highest rating
                                 category by at least one nationally recognized
                                 statistical rating organization.
                                       25
<PAGE>   42
 
                                  RISK FACTORS
 
LIMITED LIQUIDITY
 
     There is currently no market for the Offered Certificates, and there is no
assurance that one will develop. The underwriters with respect to an Offered
Series are expected, but are not obligated, to make a market in such Offered
Certificates. However, even if the underwriters do make such a market, there is
no assurance that such market will continue.
 
DELAYS OR REDUCTIONS IN PAYMENTS DUE TO INSOLVENCY
 
     The transfers of the Dealer Notes from NITC to NFC, from NFC to the Seller
and from the Seller to the Active Trust have been structured to be treated as
sales. In the event that NITC, NFC or the Seller were to become a debtor in a
bankruptcy case and a creditor or trustee in bankruptcy of such debtor or such
debtor itself were to take the position that the transfer of the Dealer Notes by
such debtor should be recharacterized as a pledge of such Dealer Notes to secure
a borrowing of such debtor, then delays in payments of collections on the Dealer
Notes to the Active Trust could occur and, if a court ruled in favor of any such
creditor, trustee in bankruptcy or debtor, reductions in the amount of such
payments could result. If the transfer of Dealer Notes to NFC, the Seller or the
Active Trust were recharacterized as a pledge, then a tax or other similar lien
on the property of NITC, NFC or the Seller might have priority over the interest
of the Seller or the Active Trust, respectively, in such Dealer Notes. See
"Certain Matters Relating to Bankruptcy."
 
     In addition, if NFC or the Seller were to become a debtor in a bankruptcy
case and a creditor or trustee in bankruptcy of such debtor or such debtor
itself were to request a bankruptcy court to order that NFC be substantively
consolidated with the Seller, delays in and reductions in the amount of payments
and distributions on the Offered Certificates could result.
 
     If certain events relating to the bankruptcy of NIC, NITC, NFC or the
Seller occur, then an Investment Event or Early Amortization Event will occur
and, among other things, the Active Trust will stop acquiring additional Dealer
Notes. See "Certain Matters Relating to Bankruptcy."
 
     Transfers made in certain specified transactions contemplated by the
Applicable Agreement, including payments made with respect to repurchases of
Dealer Notes, may be recoverable by NITC, NFC, the Servicer or the Seller, as
debtor in possession, or by a creditor or a trustee in bankruptcy of NITC, NFC,
the Servicer or the Seller as preferential transfers from NITC, NFC, the
Servicer or the Seller if such transfers are made within certain periods prior
to the filing of a bankruptcy case in respect of NITC, NFC, the Servicer or the
Seller.
 
     The Seller warrants in the Applicable Agreement that transfers of the
Dealer Notes to the Active Trust are either (a) valid transfers and assignments
of the Dealer Notes and the proceeds thereof to the Active Trust or (b) a grant
to the Active Trust of a security interest in such property. The Seller has
taken all required actions under Illinois, New York and Delaware state law to
perfect the 1990 Trust's interests and the Master Trust's interests in such
assets. The Seller has also taken all actions necessary under Illinois and New
York law to perfect the transfer to the Master Trust of the 1990 Trust Seller
Certificate and the Class A-4 Investor Certificate and will take all actions
necessary under Illinois and New York law to perfect the transfer to the Master
Trust of any Related 1990 Certificate. In addition, the Seller warrants that, if
the transfer of Dealer Notes by the Seller to the Active Trust is a grant to the
Active Trust of a security interest in the Dealer Notes, the Active Trust will
at all times have a first priority perfected security or ownership interest in
all Dealer Notes transferred to the Active Trust and all proceeds thereof,
except that if such a transfer is deemed to create a security interest under the
Illinois, New York or Delaware Uniform Commercial Codes (collectively, the
"Uniform Commercial Code"), certain prospective liens on the property of the
Seller may have priority over the Active Trust's interests in such Dealer Notes.
 
     Pursuant to the terms of the Applicable Agreement and the Active Purchase
Agreement, under certain circumstances the Seller may be required to purchase
Ineligible Dealer Notes from the Active Trust, in which case NFC will be
required to purchase all such Ineligible Dealer Notes from the Seller. In
addition, in the event of a breach of certain representations and warranties or
if a material amount of Dealer Notes are
 
                                       26
<PAGE>   43
 
Ineligible Dealer Notes, and (a) prior to the 1990 Trust Termination Date, such
event has a material adverse effect on the holders of the 1990 Trust Investor
Certificates, the Seller may be required to purchase all outstanding classes of
1990 Trust Investor Certificates or (b) after the 1990 Trust Termination Date,
such event has a material adverse effect on the Certificateholders, the Seller
may be required to purchase the Certificateholders' Interest. In either case,
NFC will be required to purchase all such outstanding certificates or the
Certificateholders' Interest from the Seller. See "Description of the Offered
Certificates -- Certain Representations and Warranties; Ineligible Dealer Notes;
and Purchase of Certificateholders' Interest." The 1990 Trust Trustee has not,
and it is not anticipated that either it or the Master Trust Trustee will, make
any examination of the Dealer Notes or the records relating thereto for the
purpose of establishing compliance with eligibility requirements,
representations and warranties or any other purpose.
 
     Application of federal and state bankruptcy and debtor-related laws could
affect the interests of the Master Trust in the Dealer Notes (as holder of 1990
Trust Investor Certificates, including any Related 1990 Certificate) prior to
the 1990 Trust Termination Date, and the interests of the Offered
Certificateholders in the Dealer Notes after the 1990 Trust Termination Date, if
such laws result in any Dealer Notes being written off as uncollectible or
result in delays in payments due on such Dealer Notes.
 
LIMITED AMOUNT OF CREDIT ENHANCEMENT
 
     Prior to the 1990 Trust Termination Date, the Master Trust is dependent
upon distributions by the 1990 Trust in respect of the Related 1990 Certificate,
Investment Income and Swap Receipts to fund payments and distributions to the
Offered Certificateholders and Swap Payments with respect to each such Offered
Series. Therefore, prior to the 1990 Trust Termination Date, credit enhancement
with respect to any Offered Series will only be provided through the 1990 Trust
and by the Interest Rate Swap and, under certain circumstances, the Negative
Carry Reserve Fund with respect to such Offered Series. Credit enhancement of
the 1990 Trust Investor Certificates (including any Related 1990 Certificates)
is afforded by the use of 1990 Trust Excess Servicing and subordination of the
1990 Trust Seller Interest to the extent of the 1990 Trust Available
Subordinated Amount. Such subordination is effected by payments from 1990 Trust
Seller Interest Income, the 1990 Trust Spread Account, the proceeds of 1990
Trust Investment Securities and (during a 1990 Trust Amortization Term) the 1990
Trust Liquidity Reserve Account, and by reductions in the 1990 Trust Seller
Interest. Credit enhancement of the 1990 Trust Investor Certificates will be
limited at all times during the term of the 1990 Trust to the sum of 1990 Trust
Excess Servicing and the 1990 Trust Available Subordinated Amount. If at any
time during the term of the 1990 Trust the 1990 Trust Available Subordinated
Amount is reduced to zero, the holders of 1990 Trust Investor Certificates
(including the Master Trust, as holder of a Related 1990 Certificate) will
thereafter bear the credit and other risks associated with their fractional
undivided interest in the 1990 Trust directly without the benefit of any further
credit enhancement other than 1990 Trust Excess Servicing, if any. Accordingly,
a 1990 Trust Early Amortization Period could occur, leading to an Investment
Event or Early Amortization Event with respect to the Offered Certificates. In
that case, under certain circumstances, losses on the Offered Certificates could
result if credit enhancement in respect of the Related 1990 Certificate has been
exhausted.
 
     After the 1990 Trust Termination Date, credit enhancement of an Offered
Series will be provided by the subordination of a portion of the Master Trust
Seller's Interest to the extent of the Available Subordinated Amount as
described herein, plus, in some instances, the Negative Carry Subordinated
Amount, the Spread Account and the Interest Rate Swap with respect to such
Offered Series. The amount of such credit enhancement is limited and will be
reduced from time to time as described herein. See "Description of the Offered
Certificates -- Allocation of Collections Prior to the 1990 Trust Termination
Date" and "--Allocation of Collections After the 1990 Trust Termination Date."
 
BASIS RISK ON DEALER NOTES
 
     The interest rate on Dealer Notes is presently based on the prime rate,
while the Related 1990 Certificate Rate and the Applicable Floating Rate will be
based on the one-month London interbank offered rate as determined by the Active
Trustee ("LIBOR"). The prime rate, which is an "administered" rate, tends to lag
behind one-month LIBOR, which is a "market rate," and the spread between the
prime rate and LIBOR
 
                                       27
<PAGE>   44
 
could thus narrow or disappear during periods of rising interest rates. During
the past ten years, the prime rate has exceeded one-month LIBOR at all times.
However, there is no assurance that the prime rate will continue to exceed LIBOR
in the future. In addition, the approximate five week lag between the date on
which the interest rate on Dealer Notes is established by NFC and the date on
which the Related 1990 Certificate Rate and the Applicable Floating Rate are
fixed could create a distortion during periods of rapidly rising or volatile
interest rates, even though the underlying prime rate-LIBOR relationship
remained constant during such period. See "Description of the Offered
Certificates -- Due Periods; Distribution Periods." If any of the foregoing
situations causes the positive spread between the Dealer Note interest rate and
the Related 1990 Certificate Rate or the Applicable Floating Rate to decline or
disappear in the future, the result could be, under certain circumstances, an
Investment Event or Early Amortization Event and, if all sources of credit
enhancement were exhausted, losses on the Offered Certificates. Credit
enhancement, if available, will minimize the effect of any such situation.
 
RISK OF DEFAULT BY INTEREST RATE SWAP COUNTERPARTY
 
     A payment default by a Swap Counterparty will result in the commencement of
an Early Amortization Period and may result in the termination of the Interest
Rate Swap. Amounts, if any, on deposit in the Negative Carry Reserve Fund will
be available to make interest payments on the Offered Certificates during an
Early Amortization Period. Nonetheless, if the Interest Rate Swap is terminated,
reductions in the amount of interest paid on the Offered Certificates may
result. See "Description of the Offered Certificates -- Interest Rate Swap" and
"-- Early Amortization Events."
 
DEPENDENCE OF ACTIVE TRUST ON NFC AND NITC
 
     The Active Trust is completely dependent on NFC as its exclusive source for
Acquisitions or Assignments of new Dealer Notes. The ability of NFC to supply
new Dealer Notes to the Active Trust is in turn dependent to a substantial
degree on the ability of NITC to sell Navistar Vehicles to Dealers in exchange
for Dealer Notes. There is, however, no assurance that NITC will continue to
sell Navistar Vehicles at the same rate as in prior years as a result of the
possibility of declining sales in the trucking industry generally, strikes,
fires or other unforeseeable events. A significant decline in NITC's sales of
Navistar Vehicles may cause an Investment Event or Early Amortization Event.
 
     NITC currently purchases all new Navistar Vehicles that NFC has repossessed
from terminated Dealers for cash equal to the balance due on the underlying
Dealer Notes financing such vehicles. If NITC were to cease purchasing such
repossessed vehicles, the amount of Dealer Notes written off as uncollectible
could increase, which could, if all sources of credit enhancement under the
Active Trust were exhausted, result in losses on the Offered Certificates. NITC
currently has no plans to cease such purchases.
 
     NITC provides a substantial amount of floor plan and other financial
assistance to Dealers through a number of formal and informal programs. See "The
Navistar Financial Dealer Floor Plan Financing Business" and "Relationship with
NITC." Such financial assistance often accounts for more than half of all
outstanding interest obligations on the Dealer Notes. The Interest Deposit
Agreement requires NITC to deposit the amount of such assistance in the Interest
Deposit Account at approximately the same time that such financial assistance is
granted. However, if NITC were to discontinue providing such assistance to
Dealers, the effect could be to reduce sales of Navistar Vehicles, which may
cause an Investment Event or Early Amortization Event.
 
     If NFC were to cease acting as Servicer, delays in processing payments made
by Dealers could occur, therefore creating delays in payments to Offered
Certificateholders.
 
DEPENDENCE ON RATE OF DEALERS' PAYMENTS ON DEALER NOTES
 
     Dealer Notes are generally due and payable by Dealers upon the sale of the
underlying Financed Vehicle. The timing of such sales by the Dealers is
uncertain and there is no assurance that any particular pattern of payments will
occur on the Dealer Notes. Further, there is no assurance that new Dealer Notes
will continue
 
                                       28
<PAGE>   45
 
to be generated. A significant decline in the generation of Dealer Notes that
lasts for an extended period of time may cause an Investment Event or Early
Amortization Event.
 
     The payment of principal on the Offered Certificates is dependent on Dealer
repayments. Accordingly, a significant decline in the rate of payments on the
Dealer Notes could slow the distribution of principal on Offered Certificates
during an Early Amortization Period. In addition, the Offered Certificates may
not be fully amortized by the Expected Payment Date. In the event that other
Series are issued subsequent to the Closing Date, the payment of the Offered
Certificates in full by the Expected Payment Date may become dependent on the
reallocation of Principal Collections which are initially allocated to such
other outstanding Series. The shorter the Accumulation Period, the greater the
likelihood that such a reallocation will be necessary. If one or more other
Series from which Principal Collections are expected to be available to be
reallocated to the payment of the Offered Certificates enters into an early
amortization period or investment period, Principal Collections allocated to
such Series may not be available to be reallocated to make payments of principal
of the Offered Certificates and the final payment of principal of the Offered
Certificates may be later than the Expected Payment Date. Upon written request,
the Seller will make available to Offered Certificateholders the prospectus or
other document describing or summarizing the salient terms of any subsequently
issued Series (a "Disclosure Document") which describe the events which could
result in the commencement of an early amortization event or investment period
with respect to such outstanding Series.
 
RISKS ARISING FROM CONCENTRATION OF DEALERS
 
     As of April 30, 1997, NFC provided wholesale financing to 345 of NITC's
domestic Dealers. Of such Dealers, 100 are expected to account for approximately
75% of the Dealer Notes. As a result of this level of Dealer concentration, the
financial failure of any single Dealer could adversely affect the Offered
Certificateholders. In order to mitigate the potential impact of the financial
failure of any single large Dealer on the Active Trust, however, the Applicable
Agreement prohibits the Active Trust from holding Dealer Notes from a single
Dealer in excess of the greater of (a) $4,000,000 or (b) 2.0% of the sum of the
aggregate principal balance of Dealer Notes and the aggregate principal amount
of 1990 Trust Investment Securities (or funds on deposit in the Excess Funding
Account) in the Active Trust (the "Concentration Limit"), although the Seller
has the right from time to time in its sole discretion to decrease or increase
(but not above the greater of (a) or (b) above) the Concentration Limit with
respect to any Dealer.
 
POTENTIAL ADVERSE IMPACT OF ISSUANCE OF ADDITIONAL SERIES
 
     The Master Trust is expected to issue additional Series (which may be
represented by different classes within a Series) from time to time. A
Supplement delivered in connection with the issuance of other Series will
specify certain Principal Terms applicable to such Series. Such Principal Terms
may include methods for determining applicable allocation percentages and
allocating collections, provisions creating different or additional security or
other credit enhancement, different classes of certificates (including
subordinated classes of certificates) and any other amendment or supplement to
the Pooling and Servicing Agreement which is made applicable only to such
Series. No Supplement, however, may change the terms of the Offered Certificates
or the terms of the Pooling and Servicing Agreement as applied to the Offered
Certificates. See "Description of the Offered Certificates -- New Issuances." As
long as any Offered Certificates are outstanding, a condition to the execution
of any Supplement will be that the Rating Agency Condition shall have been
satisfied.
 
     There can be no assurance, however, that the terms of any other Series
might not have an impact on the timing or amount of payments received by an
Offered Certificateholder. Although the imposition of the Rating Agency
Condition is intended to protect against the possibility that such impact would
be materially adverse to any Offered Series, the issuance of additional Series
could result in less excess interest collections being available for
reallocation to an Offered Series (for example, if the additional Series has a
higher interest rate or swap floating rate than a previously outstanding series
or class of investor certificates) and in a longer Accumulation Period or Early
Amortization Period for an Offered Series (if such additional Series were to
have an expected payment date that would require it to be in an accumulation
period at the same time as the Offered Series or if it were to enter an Early
Amortization Period at the same time as the Offered Series).
 
                                       29
<PAGE>   46
 
Further, the issuance of an additional Series will reduce the Seller's Interest
in the Active Trust, which could increase the possibility that a shortfall in
the amount of available Dealer Notes in the Active Trust would require funds to
be retained in the Active Trust and invested in short-term eligible investments
in order to maintain the required minimum seller's interest. Increased holdings
of eligible investments in the Active Trust will reduce the overall portfolio
yield of the Active Trust, which could lead to the occurrence of an Investment
Event or Early Amortization Event.
 
NITC'S ABILITY TO CHANGE TERMS OF DEALER NOTES
 
     NITC may change the terms governing new Dealer Notes at any time so long as
any such change is made on a non-discriminatory basis. Although the Active Trust
is obligated to acquire only Eligible Dealer Notes including those Dealer Notes
with an interest rate (a) based on the prime rate or another benchmark floating
interest rate and (b) subject to adjustment at least monthly, there is no
assurance that the interest rate on Dealer Notes will always exceed the Related
1990 Certificate Rate or the Applicable Floating Rate (see "Risk
Factors -- Basis Risk on Dealer Notes"). Failing to maintain an appropriate
spread between the interest rate on Dealer Notes and the Related 1990
Certificate Rate or the Applicable Floating Rate, respectively, may cause an
Investment Event or Early Amortization Event.
 
         NAVISTAR FINANCIAL SECURITIES CORPORATION AND THE MASTER TRUST
 
NAVISTAR FINANCIAL SECURITIES CORPORATION
 
     NFSC was incorporated in the State of Delaware on September 13, 1990. NFSC
was organized for the limited purpose of purchasing Dealer Notes from NFC and
transferring such Dealer Notes to third parties. NFSC's executive offices are
located at Navistar Financial Securities Corporation, 2850 W. Golf Road, Rolling
Meadows, IL, telephone (847) 734-4000.
 
THE MASTER TRUST
 
     The Master Trust was formed in accordance with the laws of the State of
Illinois pursuant to the Pooling and Servicing Agreement. Under the Pooling and
Servicing Agreement, the Seller assigned the 1990 Trust Seller Certificate and
all other rights of the Seller under the terms of the 1990 Trust Agreement to
the Master Trust. On the Closing Date with respect to any Series of Offered
Certificates, the Seller will instruct the Master Trust Trustee to deliver the
1990 Trust Seller Certificate to the 1990 Trust, and the 1990 Trust Trustee will
authenticate and deliver a Related 1990 Certificate and a reissued 1990 Trust
Seller Certificate to the Master Trust Trustee.
 
     Until the 1990 Trust Termination Date, the assets of the Master Trust will
include (a) the 1990 Trust Seller Certificate transferred by the Seller to the
Master Trust, all rights of the Seller thereunder (including the right to
exchange such 1990 Trust Seller Certificate for new classes of 1990 Trust
Investor Certificates in the manner described herein) and all monies due or to
become due with respect thereto, (b) the Class A-4 Investor Certificate, each
Related 1990 Certificate and any Subsequent 1990 Trust Investor Certificate and
all monies due or to become due with respect thereto, (c) each Interest Rate
Swap, interest rate cap, or other interest rate hedge that the Master Trust may
have entered into or obtained for the benefit of any Series and (d) all funds on
deposit in certain accounts of the Master Trust, including funds on deposit in
the Collections Account, the series principal accounts, the distribution
account, the negative carry reserve funds, if any, and any other Series Accounts
for each Series. Certain terms of the 1990 Trust, and the 1990 Trust Seller
Certificate, the Class A-4 Investor Certificate and the Related 1990
Certificates issued and to be issued thereunder, are described herein under the
heading "Terms of the 1990 Trust Investor Certificates."
 
     As of the 1990 Trust Termination Date, (a) the 1990 Trust will transfer to
the Master Trust all of its right, title and interest in and to all of the
property of the 1990 Trust (other than funds on deposit in the Trust Accounts
for the benefit of, and allocated to, 1990 Trust Investor Certificates that are
not held by the Master Trust), and (b) the Class A-4 Investor Certificate, each
Related 1990 Certificate, any Subsequent 1990 Trust Investor Certificate and the
1990 Trust Seller Certificate will automatically be canceled, and all rights of
the
 
                                       30
<PAGE>   47
 
Master Trust with respect to such certificates will terminate. As of the 1990
Trust Termination Date, funds on deposit in the 1990 Trust Spread Account will
be transferred to the Master Trust, allocated among an Offered Series and any
other outstanding Series that so provides based on the projected spread for each
such Series (including the Projected Spread for the Offered Series) and
deposited in the associated Spread Account for the benefit of the Offered
Certificateholders and the spread accounts for each other outstanding Series for
the benefit of the Certificateholders of such other outstanding Series; 1990
Trust Investment Securities will be transferred to the Master Trust and
deposited in the Excess Funding Account for the benefit of the
Certificateholders; and funds on deposit in the 1990 Trust Interest Deposit
Account will be transferred to the Master Trust and deposited in the Interest
Deposit Account, subject to allocation and distribution as Finance Charge
Collections to the extent described herein. Thus, after the 1990 Trust
Termination Date, the assets of the Master Trust will include (a) all Dealer
Notes transferred to the Master Trust by the 1990 Trust and all Dealer Notes
thereafter transferred to the Master Trust by the Seller, all monies due or to
become due with respect thereto and all proceeds of such Dealer Notes, (b) the
interest of the Seller in the security interests in the Financed Vehicles
related to the Dealer Notes and all proceeds thereof, (c) the interest of the
Seller in any amounts recovered by the Servicer pursuant to any casualty
insurance policies covering any Dealer with respect to Financed Vehicles (the
"Insurance Proceeds"), (d) each Interest Rate Swap, interest rate cap or other
interest rate hedge, if any, entered into or obtained by the Master Trust
Trustee for the benefit of any Series, and (e) all funds on deposit in certain
accounts of the Master Trust, including funds on deposit in the Series Principal
Account, the Distribution Account, the Spread Account, the Excess Funding
Account, the Interest Deposit Account, the Negative Carry Reserve Fund and any
other Series Account created under a Supplement to the Pooling and Servicing
Agreement associated with the Offered Series.
 
     On each business day (except in certain limited circumstances) during the
term of the Active Trust, NFC will sell Dealer Notes to the Seller and the
Seller will transfer such Dealer Notes to the Active Trust based on criteria
provided in the Applicable Agreement. Accordingly, the aggregate amount of
Dealer Notes in the Active Trust will fluctuate from day to day as new Dealer
Notes are generated and as existing Dealer Notes are collected, charged off as
uncollectible or otherwise adjusted or removed from the Active Trust.
 
     The Master Trust was formed pursuant to the Pooling and Servicing Agreement
for these and similar transactions. Prior to formation, the Master Trust had no
assets or obligations. The Master Trust has not engaged and will not engage in
any business activity other than acquiring and holding 1990 Trust Investor
Certificates, the 1990 Trust Seller Certificate, the Dealer Notes, and the other
assets of the Master Trust described herein and proceeds therefrom, issuing
certificates of any Series or class, and issuing the Master Trust Seller's
Certificate.
 
                                USE OF PROCEEDS
 
     Except as provided in the Prospectus Supplement, the net proceeds from the
sale of the Offered Certificates will be paid to the Seller, which will use such
proceeds (net of any amounts retained in the Excess Funding Account to maintain
the Master Trust Seller's Interest at least equal to the Minimum Master Trust
Seller's Interest) to repay indebtedness to NFC incurred by the Seller in
connection with the Seller's purchase of Dealer Notes from NFC prior to the
associated Closing Date under a Master Revolving Credit Agreement between NFC
and the Seller (the "Master Revolving Credit Agreement"). Interest accrues on
the outstanding principal amount of the note representing such indebtedness (the
"Master Revolving Note") at a rate per annum equal to the prime rate of interest
announced from time to time by Morgan Guaranty Trust Company of New York. The
principal amount of the Master Revolving Note is due and payable on the date on
which the Master Trust Purchase Agreement terminates in accordance with its
terms. NFC will use the proceeds received from the Seller to repay outstanding
short term indebtedness.
 
          THE NAVISTAR FINANCIAL DEALER FLOOR PLAN FINANCING BUSINESS
 
     Wholesale promissory notes issued by Dealers to NITC or NFC ("Dealer
Notes") are conveyed to the Active Trust by the Seller pursuant to the
Applicable Agreement. When used herein, unless the context otherwise requires,
"Dealer Notes" shall refer to those Dealer Notes which are held by the Active
Trust. The
 
                                       31
<PAGE>   48
 
Dealer Notes are issued by Dealers to purchase new vehicles manufactured or
distributed by NITC (each such vehicle, a "Navistar Vehicle") or other
manufacturers (each such vehicle, an "OEM Vehicle") or to finance new trailers,
used vehicles and used trailers accepted in trade by Dealers or purchased by
them (all such new and used vehicles and trailers, "Financed Vehicles"). The
Active Trust will include Dealer Notes financing OEM Vehicles for a Dealer only
if NFC also provides financing for Navistar Vehicles for such Dealer.
 
     As used herein, "Dealer" means (a) a person with whom NITC has a valid
Dealer Agreement to sell Navistar Vehicles, (b) a truck equipment manufacturer
to whom NITC sells vehicles pursuant to a valid Dealer Agreement or (c) a person
with whom NFC has a valid Dealer Agreement to extend used truck floor plan
terms.
 
     NFC is the principal source of "wholesale" or "floor plan" financing for
Dealers in the United States, financing, as of April 30, 1997, 90% of the total
number of Dealers (approximately 345). The percentage of new NITC trucks sold
directly to Dealers in the United States for which NFC provided financing was
approximately 95% and 94% for the first six months of fiscal years 1997 and
1996, respectively, and 94%, 93%, 93%, 89% and 88% for fiscal years 1996, 1995,
1994, 1993 and 1992, respectively. Dealers financed by NFC include medium duty
truck dealers, medium and heavy duty truck dealers and a small number of allied
equipment manufacturers (such as school bus distributors and manufacturers and
distributors of cement mixers) who purchase chassis or other truck components
from NITC. NFC services the Dealers through its home office located in Rolling
Meadows, Illinois and through six District Finance Offices located throughout
the United States.
 
CREATION OF DEALER NOTES
 
     NFC finances 100% of the wholesale invoice price of new Financed Vehicles,
including destination charges. In the case of Navistar Vehicles, NITC creates a
wholesale note upon shipment of each new truck to a Dealer and executes such
wholesale note under the signature authority of the Dealer granted to NITC. NFC
purchases all wholesale notes relating to new Navistar Vehicles from Dealers
financed by NFC on a daily basis from NITC (see "Relationship With NITC").
 
     NFC creates wholesale notes with respect to OEM Vehicles upon NFC's receipt
of an invoice from the vehicle manufacturer and executes such wholesale note
under the signature authority of the Dealer granted to NFC. NFC finances 75% of
the as-is appraised retail value of used vehicles taken in trade by a Dealer or
purchased by a Dealer from outside sources, and 100% of the purchase price for
used vehicles purchased by a Dealer from a NITC Used Truck Center and at 100% of
the NFC appraised value for repossessed vehicles purchased from NFC. Used
vehicles represented approximately 8% and 6% of the aggregate amount of
wholesale notes serviced by NFC as of April 30, 1997 and 1996, respectively, and
8%, 7%, 7%, 7% and 8% of the aggregate amount of wholesale notes serviced by NFC
as of October 31, 1996, 1995, 1994, 1993 and 1992, respectively. NFC will
continue to purchase from NITC wholesale notes issued by a Dealer for new
Navistar Vehicles and to provide floor plan financing to a Dealer for used
vehicles so long as such Dealer's Dealer Agreement is in effect and such Dealer
satisfies NFC's Credit Guidelines (see "-- Credit Approval Process and Credit
Guidelines" and "-- Dealer Monitoring; Write-Offs").
 
CREDIT APPROVAL PROCESS AND CREDIT GUIDELINES
 
     NFC provides floor plan financing to Dealers pursuant to pre-established
credit guidelines ("Credit Guidelines"). NFC must approve each prospective
Dealer before such Dealer receives a NITC Dealer Sales/Maintenance Agreement (a
"Dealer Agreement").
 
     NFC bases its approval upon a credit evaluation of the principal owners of
a prospective Dealer and such Dealer's capital structure. In conducting such an
evaluation, representatives of NFC's District Finance Office will conduct
interviews with prospective Dealer principal(s), obtain credit applications and
personal financial statements, review "letters of intent" provided by management
of the prospective dealership and review existing business plans and proposed
funding sources for the purchase and/or financing of the prospective dealership
(which proposals generally include pro forma financials for the following three
to five years). In
 
                                       32
<PAGE>   49
 
addition, NFC will obtain both personal and business credit references and will
evaluate any available credit bureau reports.
 
     If a prospective Dealer is approved by NFC, the Dealer and NITC enter into
a Dealer Agreement and NITC offers the Dealer wholesale floor plan terms
approved by NFC. The principal owner of the Dealer is generally required by NFC
to guarantee the Dealer's obligations to NITC and NFC. Pursuant to the Dealer
Agreement, in order to secure all indebtedness of the Dealer to NFC or NITC, the
Dealer grants to NFC and NITC a first priority security interest in its
inventory of new and used vehicles. Generally, the Dealer also grants NFC a
security interest in its service parts inventory. NFC maintains a master
physical damage insurance policy providing coverage for each Financed Vehicle
with Harco National Insurance Company ("Harco"), a wholly owned subsidiary of
NFC. The policy provides coverage to NFC and the related Dealer on all Financed
Vehicles for the actual cash value of each such Financed Vehicle up to an
aggregate amount of $10 million per contiguous Dealer location for each loss
occurrence. Harco maintains reinsurance with financially strong, non-affiliated
reinsurers for any loss in excess of $250,000 per occurrence. The policy has
been endorsed to provide that the Seller and the 1990 Trust Trustee are loss
payees as their interests may appear, and such policy (or any successor policy)
will be endorsed to provide that the Master Trust Trustee will be substituted
for the 1990 Trust Trustee as loss payee thereunder as of the 1990 Trust
Termination Date.
 
     NFC establishes a base inventory guideline to provide floor plan financing
adequate for a Dealer's normal vehicle sales. The inventory guidelines are based
upon the Dealer's financial strength, its current credit and collection history
and the Dealer's historical or projected sales volume. NFC reviews a Dealer's
guideline at least annually.
 
     Each month, the NFC corporate office staff and the appropriate District
Finance Office compare each Dealer's prescribed inventory guideline with the
aggregate principal amount of wholesale notes actually issued by such Dealer and
outstanding. If the amount of notes outstanding exceeds the Dealer's guideline
by a certain percentage (which percentage is based upon the Dealer's financial
strength rating), the NFC District Credit Manager may place the Dealer on
inventory control. In addition, a Dealer may also be placed on inventory control
if such Dealer fails to remit proceeds as agreed, if the Dealer's new or used
vehicle inventory is over-aged, if the Dealer's Open Account is past due or if a
Dealer's check is returned unpaid. Once any Dealer is placed on inventory
control, the District Finance Office will report monthly to NFC home office
management any progress made to resolve the deficiency. Upon its review, NFC
corporate office management will take appropriate actions with respect to such
Dealer. For example, NITC may be requested to sell and transfer certain truck
inventory to another Dealer, and, in extreme cases, NFC may foreclose on all
outstanding wholesale notes, place the Dealer on cash-on-delivery terms or
terminate the Dealer.
 
     Dealers that are placed on inventory control will not receive NFC financing
for shipments unless specifically approved by NFC. Accordingly, if NITC
generates a wholesale note to finance the purchase of a Navistar Vehicle by a
Dealer on inventory control without the prior approval of NFC, NFC will charge
NITC for the amount of such wholesale note. NFC may approve shipments to a
Dealer on inventory control to fill orders for trucks that have already been
sold to a retail purchaser or to permit the Dealer to stock a particular model
vehicle. A Dealer will remain on inventory control until the circumstances that
caused it to be placed on inventory control are remedied to the satisfaction of
the District Finance Office Credit Manager. NFC will not purchase the invoice or
set up a floor plan note for OEM Vehicles if a Dealer is in default or shipment
is otherwise not approved by NFC.
 
                                       33
<PAGE>   50
 
     The following table sets forth the percentage of Dealers on inventory
control and the percentage of the total wholesale note balances of such Dealers
as of the end of the fiscal quarters specified:
 
<TABLE>
<CAPTION>
                                                                       PERCENTAGE OF NOTES
               FISCAL QUARTER                 PERCENTAGE OF DEALERS      FROM DEALERS ON
             ENDING LAST DAY OF               ON INVENTORY CONTROL      INVENTORY CONTROL
             ------------------               ---------------------    -------------------
<S>                                           <C>                      <C>
Fiscal Year 1997
  January...................................           0.8%                    1.6%
  April.....................................           0.8                     1.6
Fiscal Year 1996
  January...................................           2.1                     1.1
  April.....................................           1.6                     2.0
  July......................................           1.9                     2.6
  October...................................           1.6                     2.1
Fiscal Year 1995
  January...................................           2.9                     4.9
  April.....................................           2.2                     0.9
  July......................................           2.6                     1.6
  October...................................           2.3                     1.4
Fiscal Year 1994
  January...................................           6.5                    11.8
  April.....................................           5.0                     7.7
  July......................................           5.1                     8.9
  October...................................           4.0                     6.2
Fiscal Year 1993
  January...................................           6.0                    11.9
  April.....................................           7.3                    12.7
  July......................................           7.1                    12.6
  October...................................           6.2                    10.6
Fiscal Year 1992
  January...................................           6.3                    10.6
  April.....................................           6.9                    10.1
  July......................................           6.4                    10.1
  October...................................           6.5                     8.7
</TABLE>
 
     The high percentage of Dealers on inventory control in 1992 through 1994
reflects the time necessary for Dealers impacted by the recession in 1991 and
1992 to rebuild their financial strength to a level where they can be taken off
inventory control. A key component in NFC's credit approval system is the
Dealer's equity position; in the event that a Dealer is put on inventory control
due to low equity, then its removal from inventory control is dependent upon
increasing its sales and profits over the period of time necessary to rebuild
its equity.
 
PAYMENT TERMS
 
     A wholesale note issued by a Dealer for a new Financed Vehicle is due on
the earlier of the sale of the truck or a specified date generally within 12
months from the first day of the calendar month following the date of shipment
of the truck to the Dealer. If such note is not paid at the end of the 12-month
period, the Dealer may extend the term of the note for 90 days in exchange for a
quarterly curtailment payment equal to 10% of the original balance of the note.
These curtailment payments and 90-day extensions are permitted until the balance
of the note is paid in full or until the unit is sold, as long as the Dealer
maintains its floor plan financing arrangements with NFC and the related
Financed Vehicle is on-hand and in saleable condition. NFC may in its
discretion, based upon local or regional economic conditions, waive such
curtailment payments.
 
     A wholesale note secured by a used vehicle is due on the earlier of the
sale of the Financed Vehicle or a specified date generally no later than 180
days from the date of financing. A Dealer is allowed to extend quarterly the
term of a used vehicle wholesale note for 90-day periods upon payment of a
curtailment amount
 
                                       34
<PAGE>   51
 
equal to 10% of the original principal balance of the wholesale note. These
extensions may continue until the note is paid in full. NFC may in its
discretion waive any curtailment payment.
 
     Currently, NFC charges interest on wholesale notes outstanding during any
month at a rate equal to the prime rate plus a designated spread. The prime rate
is currently reset monthly by NFC based upon the reference banks' prime rate as
of the third Monday of the preceding month and is applied to all balances
outstanding during the applicable period. Wholesale notes secured by new
vehicles currently bear interest at a spread equal to 1% over the prime rate,
while used vehicle wholesale notes bear interest at a spread equal to 1 1/2%
over the prime rate.
 
     The competitive rate environment is changing the pricing of Dealer floor
plan financing. Upon giving notice to the Dealers, NITC/NFC may change the
reference rate mechanism in any manner (including changing the reference banks,
the intervals between which the reference rate is reset or the reference rate
itself) or the applicable spread(s). In addition, NFC may from time to time
offer special pricing programs to Dealers who enroll in those programs. NFC is
currently offering the Advantage program which allows an enrolled Dealer to
obtain discounts based on the volume and finance market share of retail finance
and lease business generated by that Dealer. A Dealer can earn rebates that
effectively reduce its floor plan financing charges by up to 100 basis points.
Additional pricing actions may be taken by NFC to meet competition in their
market area.
 
     NFC also currently charges each Dealer a monthly charge (the "Flat Charge")
equal to 0.065% of the Dealer's aggregate outstanding wholesale note balance as
of the end of each month, subject to certain monthly minimum charges. Upon
giving notice to the Dealers, NITC/NFC may change the Flat Charge percentage.
 
BILLING AND COLLECTION PROCEDURES
 
     A statement (the "Open Account Statement") setting forth interest and Flat
Charges and other billing and account information is prepared by NFC and
distributed on a monthly basis to each Dealer. Each Dealer's Open Account
Statement is generated on approximately the second business day of the month,
and payments are due on the fifteenth day of the month in which they are billed.
Interest and Flat Charges are billed in arrears. Dealers remit interest payments
by check or electronic funds transfer to a lockbox owned by NFC. See
"Relationship with NITC -- Open Account."
 
     Each Dealer's monthly Open Account Statement also contains a "Wholesale
Note and Inventory Statement" prepared by NFC, listing each outstanding note
issued by the Dealer and detailing all credits and debits applied to each
wholesale note during the period. Dealers are required to remit principal
payments on wholesale notes when due by check or electronic funds transfer to
NFC's lockbox.
 
DEALER MONITORING; WRITE-OFFS
 
     NFC Finance Sales Representatives or agents of NFC conduct physical
inventories of each Dealer's inventory on a regular basis to verify that the
Dealer is paying its wholesale notes upon receiving payment for the related
Financed Vehicles from retail customers. NFC performs these inventories monthly
for most Dealers, although some Dealers with satisfactory financial strength and
good payment histories or with small dealerships in remote areas are inventoried
only every sixty to ninety days. The timing of each visit is varied and no
advance notice is given to the Dealer. Representatives conduct a physical
inventory by comparing the serial numbers of the vehicles on the Dealers'
premises to a current listing of vehicles being financed by NFC. Representatives
also confirm with outside sources such as body shops that they hold units of a
Dealer's inventory. NFC District Finance Offices perform approximately five test
checks per month to ensure that each Finance Sales Representative's inventory
procedures are proper. Test check procedures are more stringent than inventories
and involve a review of a Dealer's remittance habits and financial records and
an evaluation of such Dealer's financial strength.
 
     When NFC discovers that a Dealer is suffering financial difficulties, NFC's
District Finance Office closely monitors the Dealer while working with the
Dealer to improve its financial condition. In these circumstances, NFC field
management personnel may perform a more detailed audit to verify a Dealer's
inventory, cash and sales records. These detailed audits also take place when
the routine inventory reveals a shortage in a Dealer's inventory, when NFC
receives from a Dealer a check for which the Dealer does not
 
                                       35
<PAGE>   52
 
have sufficient funds or when NFC deems itself insecure. The Dealer is required
to make a payment in certified funds of all amounts owing to NFC before the NFC
representative leaves the Dealer's premises. If the Dealer cannot pay the amount
owing to NFC, NFC will place the Dealer on cash-on-delivery status for parts
orders, and prohibit future shipment of vehicle orders to the Dealer unless such
orders are "sold orders" and specific arrangements are made to assure prompt
receipt of the proceeds by NFC.
 
     If NFC's review reveals that a Dealer has used proceeds from vehicle sales
due to NFC for other purposes, the NFC District Finance Office places the Dealer
on cash-on-delivery terms, causes NITC to hold all shipments to the Dealer and
sends letters to the Dealer's guarantors and bank advising them of NFC's
interest in the Dealer's funds. In addition, NFC's District Finance Office
management takes certain actions at the dealership, including obtaining the
manufacturer's statement of origin or the certificate of title for each vehicle
in the Dealer's inventory.
 
     If a Dealer is unable to pay amounts owing to NFC, NITC may terminate such
Dealer's Dealer Agreement in accordance with the terms of the Dealer Agreement
and applicable state law. Generally, in such circumstances the Dealer will
return all new trucks and parts inventory to NITC in accordance with the terms
of the Dealer Agreement and will receive credit against such Dealer's
outstanding wholesale notes. If the Dealer resists such termination, however,
NFC will declare the Dealer in default of its obligations, accelerate its
wholesale notes and foreclose on its collateral by taking possession of the
Dealer's vehicle and parts inventory or, if necessary, NFC will obtain a court
order requiring foreclosure. The Dealer's new vehicle inventory purchased from
NITC is returned to NITC in exchange for NITC's cash payment in full of such
Dealer's wholesale notes and the fulfillment of any other obligations owing to
NFC subject to the terms of the Dealer Agreement and applicable state law.
(Similar arrangements are in effect with other OEM Suppliers with respect to OEM
Notes.) Used vehicles are sold to the highest bidder; the proceeds are paid to
NFC to satisfy amounts owing to it. NFC will seek to collect any remaining
amounts it is owed from any other collateral that it may hold and from the
Dealer's guarantors. Once NFC has commenced liquidating a Dealer's inventory, it
writes off any amounts that it identifies as uncollectible. During the course of
a liquidation, NFC may recognize additional losses or recoveries. Collections
under a parts security agreement, a guarantee or other security arrangement are
generally allocated to the following items in the following order: Open Account
balances, new wholesale note balances, parts note balances, deficiency balances
on used floor plan notes, Dealer retail note deficiencies, retail note recourse
obligations, and finally, obligations owed to NITC by the Dealer. Dealer Notes
secured by new OEM Vehicles also are generally foreclosed by return of such
vehicles to the manufacturer in the event of Dealer termination.
 
                             RELATIONSHIP WITH NITC
 
     NITC manufactures and markets medium and heavy duty trucks, including
school buses, mid-range diesel engines and replacement parts primarily for sale
in the United States and Canada, as well as selected export markets. NITC has
been manufacturing trucks for approximately 90 years; it is now the industry
market share leader in the North American combined medium and heavy duty truck
market, offering a full line of diesel-powered products in the common carrier,
private carrier, government/service, leasing, construction, energy/petroleum and
student transportation markets. NITC also produces mid-range diesel engines for
use in its medium duty trucks, school buses and selected heavy duty truck models
and for sale to original equipment manufacturers. As NFC is a wholly owned
finance subsidiary of NITC, the level of NFC's floor plan financing activity is
substantially dependent on the level of sales of NITC and its Dealers so that
any continuing material change therein may have a corresponding effect on NFC's
floor plan financing business.
 
     NITC provides floor plan assistance to Dealers through several formal and
informal programs, which are specifically discussed in "Special Price Allowances
at Retail" and "Floor Plan Financing Assistance." Much of this assistance is
provided at the option of NITC, which may terminate any of such optional
programs in whole or in part at any time.
 
INTEREST DEPOSIT AGREEMENTS AND INTEREST DEPOSIT ACCOUNTS
 
     In order to promote the sale of Navistar Vehicles, NITC periodically grants
interest credits to Dealers and implements programs pursuant to which NITC
undertakes to pay, on behalf of the Dealers, interest owing
 
                                       36
<PAGE>   53
 
on the related Dealer Notes (during such time, such Dealer Notes are referred to
as "Non-Interest Bearing Dealer Notes"). In order to insure that the amount of
such interest owed to the Active Trust will be available (i) prior to the 1990
Trust Termination Date, NITC, the Servicer and the 1990 Trust Trustee have
entered into an interest deposit agreement (the "1990 Trust Interest Deposit
Agreement") and (ii) after the 1990 Trust Termination Date, NITC, the Servicer
and the Master Trust have entered into an interest deposit agreement which will
become effective on the 1990 Trust Termination Date (the operative Interest
Deposit Agreement being the "Active Interest Deposit Agreement"), in each case
pursuant to which NITC makes or will make weekly deposits into the 1990 Trust
Interest Deposit Account or the Interest Deposit Account, as applicable, in an
amount equal to the amount of interest NITC has undertaken during that week to
pay on behalf of the Dealers. Pursuant to the terms of the Active Interest
Deposit Agreement, NITC and the Servicer will calculate the NITC Interest Amount
as of the close of business on Friday (or the immediately preceding business day
if such Friday is not a business day) of each week and as of the close of
business on the last business day of each Due Period (each, a "Calculation
Day").
 
     The "NITC Interest Amount" equals the sum of (a) the amount of the
aggregate amount of interest credits ("Up-Front Interest Credit") granted to
Dealers by NITC during the current Due Period, (b) the aggregate amount of NITC
Earned Interest on all Non-Interest Bearing Dealer Notes accrued during the
current Due Period and (c) the amount of the aggregate amount of NITC Future Due
Interest on all Non-Interest Bearing Dealer Notes as of such Calculation Day.
 
     "NITC Earned Interest" means, on any Calculation Day or NITC Interest
Transfer Date with respect to any Dealer Note that was a Non-Interest Bearing
Dealer Note during the related Due Period or any portion thereof, an amount
equal to the product of (i) the product of (a) the principal amount of such
Non-Interest Bearing Dealer Note and (b) the interest rate on such Dealer Note
billed by NFC during such Due Period (the "Current Interest Rate") and (ii) the
quotient of (a) a number equal to the number of days elapsed during the Due
Period for which the Dealer Note is outstanding and is a Non-Interest Bearing
Dealer Note and (b) the actual number of days in the related calendar year.
 
     "NITC Future Due Interest" means, with respect to any Non-Interest Bearing
Dealer Note on any Calculation Day, an amount equal to the product of (i) the
product of (a) the principal amount of such Non-Interest Bearing Dealer Note and
(b) the Current Interest Rate and (ii) the quotient of (a) a number equal to the
number of days from and including the Calculation Day to, but not including, the
date on which the obligor on such Dealer Note is requested to start paying
interest and (b) the actual number of days in the related calendar year.
 
     If on any Calculation Day (i) prior to the 1990 Trust Termination Date, the
amount on deposit in the interest deposit account which the 1990 Trust Trustee
has established and will maintain in the name of the 1990 Trust for the benefit
of the holders of 1990 Trust Investor Certificates (the "1990 Trust Interest
Deposit Account") and (ii) after the 1990 Trust Termination Date, the amount on
deposit in the interest deposit account which the Master Trust Trustee will
establish prior to the 1990 Trust Termination Date and maintain for the benefit
of the Certificateholders (the "Interest Deposit Account"), including any
interest earned thereon (collectively, the "Deposit Amount"), is less than the
NITC Interest Amount, NITC will deposit the amount of such deficiency in the
1990 Trust Interest Deposit Account or the Interest Deposit Account, as
applicable. However, if on any Calculation Day the Deposit Amount exceeds the
NITC Interest Amount, the Servicer will direct the Active Trustee to withdraw
the amount of such excess from the 1990 Trust Interest Deposit Account or the
Interest Deposit Account, as applicable, on the business day following such
Calculation Day (the "NITC Payment Date") and refund that amount to NITC.
 
MASTER INTERCOMPANY AGREEMENT
 
     The operating relationship between NFC and NITC is governed by a Master
Intercompany Agreement dated as of April 26, 1993 and amended from time to time
(the "Master Intercompany Agreement").
 
     Purchase of Notes and Accounts Receivable. The Master Intercompany
Agreement requires that NITC, with limited exceptions, offer NFC all wholesale
and retail notes and installment sales contracts which NITC acquires in the
regular course of its business from sales of trucks and related equipment to
Dealers and
 
                                       37
<PAGE>   54
 
customers. Such offers must be on terms which will (together with charges made
to others for financing services) afford reasonable compensation for the
financing services rendered by NFC to NITC and the Dealers with respect to the
sale of NITC products and used goods. NFC in turn has agreed, to the extent that
it is able to finance such purchases, that it will purchase all such receivables
without recourse except those, if any, as to which the risk of loss is
unacceptable to NFC.
 
     Pursuant to the Master Intercompany Agreement, NFC also purchases NITC
wholesale accounts receivable from the Dealers arising out of NITC's sales of
goods (primarily parts) and services to such Dealers. NFC receives compensation
from NITC in the form of a floating rate service charge for financing these
accounts.
 
     Payments to NITC for Administrative and Other Services. The Master
Intercompany Agreement provides for payment by NFC to NITC of service fees for
data processing and other administrative services provided by NITC to NFC. The
amounts of these service fees are agreed upon from time to time, taking into
consideration such services and the costs thereof. NFC paid NITC service fees of
$2.4 million, $2.4 million, $2.5 million, $2.3 million and $2.6 million, for
fiscal years 1996, 1995, 1994, 1993 and 1992, respectively.
 
NO GUARANTEE BY NITC
 
     None of the operating agreements constitute guarantees by NITC of the
interest on or principal of the notes, the account balances or any other
obligation of the obligors thereunder.
 
SPECIAL PRICE ALLOWANCES AT RETAIL
 
     NITC agrees from time to time with a Dealer to pay a portion of the
principal amount of a wholesale note issued by the Dealer when the Dealer sells
the vehicle financed by such note to a retail customer. These retail special
price allowances ("Retail SPAs") (in addition to the wholesale special price
allowances described below) are intended to respond to competitive pressures by
allowing a Dealer to offer a lower price to a potential customer.
 
     Generally, NITC will approve a Retail SPA for a vehicle held in inventory
only when the Dealer has identified a potential buyer. A representative of the
Dealer applies for the Retail SPA over the telephone, at which time a
representative of NITC asks for certain pertinent information. NITC will quote
the Dealer the Retail SPA on the telephone and later confirm it on a computer
printout sent to the Dealer. Once approved, a Retail SPA is only effective for a
60-day period; if the Dealer does not sell the vehicle to the identified
customer during that time, the Dealer must reapply for, or seek an extension of,
the Retail SPA.
 
     NITC is required to remit the amount of a Retail SPA to NFC upon the sale
by the Dealer of the vehicle financed by the wholesale note. However, NFC does
not reduce the principal balance of the wholesale note until it actually
receives payment of the Retail SPA from NITC. Although NITC has never failed to
make such a payment, it is the policy of NFC and NITC that the Dealer is
obligated to the holder of the wholesale note for the entire principal amount of
the wholesale note until NFC receives payment from NITC. If NITC becomes
financially unable to continue providing such assistance or otherwise refuses to
follow through with its payment obligations, delays in the payment of Dealer
Notes could occur as a result of Dealer disputes with NFC (in which a Dealer
could assert that the outstanding balance of the disputed Dealer Note should be
reduced by the amount of any credit or deduction previously approved by NITC
with respect to such Dealer Note).
 
     The amount of Retail SPAs paid by NITC in each month during the period
April, 1994 through April, 1997, ranged between a low of approximately 0.23% and
a high of approximately 3.18% of the outstanding Dealer Notes during such month.
 
     The amount of Retail SPAs paid by NITC during each of the consecutive
12-month periods ending on the last day of each month from April, 1994 through
April, 1997 as a percentage of sales during such period ranged between a low of
approximately 2.86% and a high of approximately 7.69%.
 
     In addition to providing Retail SPAs, from time to time NITC will also
provide wholesale special price allowances to Dealers ordering trucks for
inventory. Unlike a Retail SPA, a wholesale special price allowance
 
                                       38
<PAGE>   55
 
will reduce the invoice price of the truck and the original principal amount of
the wholesale note. Therefore, in contrast to a Retail SPA, NITC has no
subsequent principal payment obligation with respect to such wholesale note.
 
FLOOR PLAN FINANCING ASSISTANCE
 
     General. NITC currently has a number of formal and informal floor plan
assistance programs for Dealers. NITC implements these programs in two ways: by
issuing Dealers interest credits to be applied to their monthly bills, or by
paying wholesale note interest to NFC on the Dealers' behalf for a specified
period of time. In each case, these programs are agreements between NITC and the
Dealers and do not affect the Dealers' obligations on the wholesale notes until
NFC receives payment of amounts owing to it on the wholesale notes. NITC may
choose to discontinue or alter such programs in the future.
 
     Interest Credits. NITC's floor plan assistance terms currently provide
that, upon issuance of a wholesale note by a Dealer, NITC will issue a credit
(an "Interest Credit") to a Dealer's Open Account balance in order to provide
the Dealer with a specified free interest period for the related Financed
Vehicle. NITC presently provides a free interest period of 15 days for Financed
Vehicles that the Dealer has sold to retail customers, 45 days for Financed
Vehicles that the Dealer intends to hold as inventory and 105 days for school
bus chassis. The Interest Credit is issued when NITC issues an invoice for the
Financed Vehicle and is computed at the interest rate in effect as of such date,
taking into account the principal amount of the wholesale note and the number of
days covered by the interest credit.
 
     The aggregate amount of Interest Credits is applied to the Dealer's Open
Account balance on a monthly basis. If the aggregate amount of such credits
exceeds the interest charges for the month, the Dealer is entitled to apply the
excess to any of its outstanding obligations to NFC and NITC that appear on its
Open Account Statement. The Dealer remains obligated to pay interest on the
wholesale note to which the Interest Credit relates.
 
     Pursuant to the Active Interest Deposit Agreement, NITC deposits in the
1990 Trust Interest Deposit Account or the Interest Deposit Account, as
applicable on a weekly basis an amount equal to all Interest Credits granted by
it to Dealers during each such week (see "Interest Deposit Agreements and
Interest Deposit Accounts").
 
     Payment of Interest by NITC. NITC's current floor plan assistance terms
also include an agreement by NITC to pay interest on behalf of the Dealers for
the period during which the Financed Vehicles are in transit to the Dealers. In
addition, NITC periodically implements special sales programs pursuant to which
it agrees to pay interest on behalf of the Dealers for extended periods.
Pursuant to the Master Intercompany Agreement, NITC pays the amount of interest
owing on the wholesale notes directly to NFC; the Dealers are not billed for
interest owing on the wholesale notes for the specified period. NITC will
continue to pay interest on a wholesale note on behalf of a Dealer until the
first to occur of the end of the specified time period and the sale of the
related Financed Vehicle.
 
     The Active Interest Deposit Agreement requires NITC to deposit in the 1990
Trust Interest Deposit Account or the Interest Deposit Account, as applicable,
on a weekly basis an amount equal to the aggregate amount of interest that NITC
has agreed during such week to pay on behalf of the Dealers, regardless of
whether such interest has been earned on the wholesale notes or if such interest
is to be earned in the future.
 
     The following table sets forth the average monthly amount of Interest
Credits and NITC interest payments (in millions of dollars) for the periods
ended on the date specified:
 
<TABLE>
<CAPTION>
                                                     SIX MONTHS
                                                        ENDED
                                                      APRIL 30          YEAR ENDED OCTOBER 31
                                                     -----------   --------------------------------
                                                     1997   1996   1996   1995   1994   1993   1992
                                                     ----   ----   ----   ----   ----   ----   ----
<S>                                                  <C>    <C>    <C>    <C>    <C>    <C>    <C>
Average monthly amount of Interest Credits.........  $1.2   $1.8   $1.6   $1.7   $0.9   $0.6   $0.6
Average monthly amount of NITC interest payments...   1.4    1.5    1.4    1.5    1.5    1.1    1.2
</TABLE>
 
                                       39
<PAGE>   56
 
OPEN ACCOUNT
 
     NITC sells parts, accessories and other miscellaneous items, and charges
for services provided, to Dealers through their open accounts (each, an "Open
Account"). Dealers are billed monthly on their Open Account balances. NITC also
issues credits to the Open Account, which include Interest Credits, warranty
work reimbursements, other sales and interest adjustments and miscellaneous
credits. A Dealer's monthly Open Account Statement includes NFC's charge to the
Dealer for accrued wholesale note interest. This charge appears as a net item
(which is calculated in the Wholesale Note and Inventory Statement that
accompanies the Open Account Statement), and includes the application of any
Interest Credits issued to the Dealer by NITC. The Open Account Statement also
contains the Flat Charge billed to such Dealer.
 
     The Open Account billing period is for a calendar month, from the first day
of the month through the last day of the month (i.e., a Due Period). NFC issues
Open Account Statements on approximately the second business day following the
end of the Due Period. If a Dealer fails to pay its Open Account balance by the
fifteenth day of the month following the end of the Due Period, interest on the
balance of the Account is charged retroactively from the beginning of such month
until the balance is paid. The Dealer's Open Account Statement is accompanied by
NFC's Wholesale Note and Inventory Statement, which lists each truck in the
Dealer's inventory being financed during the month, showing, by unit, the amount
of interest charged by NFC during that month and the amount of Interest Credits
or other adjustments issued by NITC. The net interest owed by the Dealer after
application of Interest Credits is shown at the bottom of the Wholesale Note and
Inventory Statement and is also reflected on the Dealer's Open Account
Statement.
 
     NFC purchases the aggregate Open Account balances of all Dealers from NITC
on a non-recourse basis. NFC's purchase of Open Account items occurs during the
month as part of the daily, weekly, or monthly settlements between NITC and NFC
pursuant to the Master Intercompany Agreement. Credits due the Dealer for
warranty work, floor plan interest reimbursement and other items are netted
against the price paid by NFC for the aggregate Dealer Open Account balance.
 
                    DESCRIPTION OF THE OFFERED CERTIFICATES
 
GENERAL
 
     The Offered Certificates will be issued pursuant to the Pooling and
Servicing Agreement dated as of June 8, 1995 (as supplemented and amended from
time to time, the "Pooling and Servicing Agreement"), among NFSC, NFC, the 1990
Trust Trustee and the Master Trust Trustee, which has been filed as an exhibit
to the Registration Statement of which this Prospectus is a part. The Master
Trust Trustee will make available for inspection a copy of the Pooling and
Servicing Agreement (without exhibits or schedules) and any Supplement to
Offered Certificateholders without charge upon written request. The following
summary describes certain terms of the Pooling and Servicing Agreement, does not
purport to be complete and is qualified in its entirety by reference to the
Pooling and Servicing Agreement.
 
     The Offered Certificates will evidence undivided beneficial interests in
certain assets of the Master Trust allocated to the Offered Certificateholders'
Interest, representing the right to receive from such assets funds up to (but
not in excess of) the amounts required to make payments of interest on and
principal of the Offered Certificates pursuant to the Pooling and Servicing
Agreement.
 
     The Offered Certificates will be available for purchase in minimum
denominations of $1,000 and integral multiples thereof in book-entry form only.
The Seller will keep or cause to be kept by a transfer agent (initially the
Master Trust Trustee) a register for the Offered Certificates (the "Certificate
Register"). Unless otherwise designated by the Seller in writing to the Master
Trust Trustee, the Certificate Register will be maintained at the Corporate
Trust Office of the Master Trust Trustee. The Master Trust Trustee, the paying
agent, the transfer agent, and any agent of any of them may treat the person in
whose name any Offered Certificate is registered as the owner of such Offered
Certificate for all purposes, including receiving distributions, and none of the
Master Trust Trustee, the paying agent, the transfer agent, or any agent of any
of them will be affected by any notice to the contrary.
 
                                       40
<PAGE>   57
 
INTEREST
 
     The rate per annum at which Monthly Interest for the Offered Certificates
(the "Offered Certificate Rate") will accrue will be set forth in the Prospectus
Supplement. During each Distribution Period, Monthly Interest on the Invested
Amount will accrue at the Offered Certificate Rate for such Distribution Period
and will be payable to the Offered Certificateholders on each Distribution Date.
Monthly Interest will accrue from and including the preceding Distribution Date
(or, in the case of the first Distribution Date, from and including the Closing
Date) to but excluding the current Distribution Date and, if Monthly Interest is
calculated at a fixed rate, will be calculated on a basis of a 360-day year of
twelve 30-day months and, if Monthly Interest is calculated at a floating rate,
will be calculated on a basis of actual days elapsed and a 360-day year. Monthly
Interest due for any Distribution Date but not paid on such Distribution Date
will be due on the next Distribution Date, together with interest on such amount
at the Offered Certificate Rate for the Distribution Period related to such
Distribution Date.
 
     On each Transfer Date related to a Due Period commencing prior to the 1990
Trust Termination Date and prior to the commencement of a Class Amortization
Period with respect to the Related 1990 Certificate, interest payments received
by the Master Trust in respect of the Related 1990 Certificate (the "Related
1990 Certificate Interest Collections") and any Net Swap Receipts will be
deposited in the Distribution Account and, together with Investment Income (if
any), will be used to make payments of Monthly Interest to the Offered
Certificateholders when due. Upon the commencement, if any, of a Class
Amortization Period with respect to the Related 1990 Certificate, funds on
deposit in the Negative Carry Reserve Fund will also be used to make payments of
Monthly Interest to the Offered Certificateholders. After the 1990 Trust
Termination Date, Monthly Interest will generally be derived from Available
Certificateholder Interest Collections, Net Swap Receipts and, under certain
circumstances, withdrawals from the Spread Account, the Negative Carry Reserve
Fund, the Liquidity Reserve Account and Available Seller's Finance Charge
Collections to the extent described herein.
 
PRINCIPAL
 
     The date on which the final payment of principal with respect to the
Offered Certificates is expected to be made (the "Expected Payment Date") will
be set forth in the related Prospectus Supplement. In general, no principal
payments will be made to the Offered Certificateholders until the Expected
Payment Date or until the first Distribution Date related to the Due Period in
which an Early Amortization Period commences. Although it is expected that the
final payment in respect of the Invested Amount will be made on the Expected
Payment Date, the Invested Amount may be paid earlier or, depending on the
actual payment rate on the Dealer Notes, later, as described under "Risk
Factors -- Delays or Reductions in Payments Due to Insolvency."
 
     Distributions on the Offered Certificates will be made on each Distribution
Date to the holders of Offered Certificates in whose names the Offered
Certificates were registered (expected to be Cede, as nominee of DTC) at the
close of business on the day preceding such Distribution Date (each, a "Record
Date"). However, the final distribution on the Offered Certificates will be made
only upon presentation and surrender of the Offered Certificates. Distributions
to DTC will be made in immediately available funds.
 
     Pre-1990 Trust Termination Date. Prior to the 1990 Trust Termination Date,
unless a Class Amortization Period with respect to the Related 1990 Certificate
has commenced, the Master Trust will not receive any payments of principal in
respect of the Related 1990 Certificate (such payments are referred to herein as
the "Related 1990 Certificate Principal Collections").
 
          "Class Amortization Period" means, for a class of 1990 Trust Investor
     Certificates, the first to occur of (a) the period from and including the
     Scheduled Class Amortization Date to and including the date of the final
     distribution to the holders of such class and (b) the period from and
     including the date on which a 1990 Trust Amortization Event occurs to and
     including the date of the final distribution to the holders of such class.
 
                                       41
<PAGE>   58
 
     On each Transfer Date related to a Due Period occurring during a Class
Amortization Period with respect to the Related 1990 Certificate (which will
result in the occurrence of either an Early Amortization Event or an Investment
Event as described herein), Related 1990 Certificate Principal Collections will
be allocated between the Series Principal Account and the Negative Carry Reserve
Fund as described in "-- Allocation of Collections Prior to the 1990 Trust
Termination Date -- Allocations." The funds on deposit in the Series Principal
Account will be used to pay the Invested Amount (i) on each Distribution Date
related to a Due Period occurring during an Early Amortization Period (unless
otherwise provided in the Prospectus Supplement, commencing with the
Distribution Date related to the Due Period in which the Early Amortization
Event occurs) until the Invested Amount has been paid in full or the Series
Termination Date has occurred or (ii) on the Expected Payment Date or any Early
Distribution Date if an Investment Event has occurred. Even if the amount on
deposit in the Series Principal Account on the Expected Payment Date is
insufficient to pay the Invested Amount in full, such amount will be distributed
to the Offered Certificateholders at such time. Any remaining Related 1990
Certificate Principal Collections shall be paid to the Seller.
 
     Post-1990 Trust Termination Date. On each business day with respect to the
Revolving Period, Offered Series Principal Collections, subject to certain
limitations, will either be (a) allocated to one or more Series which are in
amortization, early amortization or accumulation periods to cover principal
payments due to the Certificateholders of any such Series or (b) if no such
Series is then amortizing or accumulating principal in series principal
accounts, (i) allocated to any variable funding certificate at the Seller's
option, (ii) allocated to and deposited in the Excess Funding Account to the
extent necessary to maintain the Minimum Master Trust Seller's Interest or (iii)
paid to the Seller.
 
     Unless and until an Early Amortization Event shall have occurred and until
the Invested Amount is paid in full, on each Transfer Date related to a Due
Period occurring during the Accumulation Period or any Investment Period,
Offered Series Principal Collections will no longer be paid for the benefit of
another Series or to the Seller as described above but instead an amount thereof
up to the Controlled Deposit Amount for each such Due Period, in the case of the
Accumulation Period, or the Invested Amount, in the case of an Investment
Period, will be deposited in the Series Principal Account and will be used to
pay the Invested Amount on the Expected Payment Date or any Early Distribution
Date. As described in "-- Allocations of Collections After the 1990 Trust
Termination Date -- Principal Collections," Shared Principal Collections and
Shared Seller Principal Collections may also be available for deposit into the
Series Principal Account in respect of the Invested Amount. If on the Expected
Payment Date the amount on deposit in the Series Principal Account is less than
the Invested Amount, the Early Amortization Period will commence and on each
Distribution Date thereafter the Offered Certificateholders will receive
distributions of Offered Series Principal Collections until the Invested Amount
has been paid in full or the Series Termination Date has occurred. If the
Expected Payment Date occurs after the Fully Funded Date, the Offered
Certificateholders will only be entitled to receive the amounts on deposit in
the Series Principal Account. See "Description of Offered Certificates --
Termination; Fully Funded Date." Even if the amount on deposit in the Series
Principal Account on the Expected Payment Date is insufficient to pay the
Invested Amount in full, such amount will be distributed to the Offered
Certificateholders at such time.
 
BOOK-ENTRY REGISTRATION
 
     Offered Certificateholders may hold their Offered Certificates through DTC
(in the United States) or CEDEL or Euroclear (in Europe) if they are
participants in such systems, or indirectly through organizations which are
participants in such systems.
 
     Cede, as nominee for DTC, will be the registered holder of the global
Offered Certificates. Except as described herein, no Offered Certificateholder
will be entitled to receive a certificate representing such person's interest in
the Offered Certificates. Unless and until Definitive Certificates are issued
under the limited circumstances described below, all references herein to
actions by Offered Certificateholders shall refer to actions taken by DTC upon
instructions from its Participants, and all references herein to distributions,
notices, reports and statements to Offered Certificateholders shall refer to
distributions, notices, reports and statements to Cede, as the registered holder
of the Offered Certificates, for distribution to the Offered Certificateholders
in accordance with DTC procedures.
 
                                       42
<PAGE>   59
 
     CEDEL and Euroclear will hold omnibus positions on behalf of their
participants through customers' securities accounts in CEDEL's and Euroclear's
names on the books of their respective depositaries which in turn will hold such
positions in customers' securities accounts in the depositaries' names on the
books of DTC. Citibank, N.A. ("Citibank") will act as depositary for CEDEL and
Morgan Guaranty Trust Company of New York will act as depositary for Euroclear
(in such capacities, the "Foreign Agency Depositaries").
 
     Transfers between DTC Participants will occur in the ordinary way in
accordance with DTC rules. Transfers between CEDEL Participants and Euroclear
Participants will occur in the ordinary way in accordance with their applicable
rules and operating procedures.
 
     Cross-market transfers between persons holding directly or indirectly
through DTC, on the one hand, and directly or indirectly through CEDEL or
Euroclear Participants, on the other, will be effected in DTC in accordance with
DTC rules on behalf of the relevant European international clearing system by
its Foreign Agency Depositary. However, such cross-market transactions will
require delivery of instructions to the relevant European international clearing
system by the counterparty in such system in accordance with its rules and
procedures and within its established deadlines (European time). The relevant
European international clearing system will, if the transaction meets its
settlement requirements, deliver instructions to its Foreign Agency Depositary
to take action to effect final settlement on its behalf by delivering or
receiving securities in DTC, and making or receiving payment in accordance with
normal procedures for same-day funds settlement applicable to DTC. CEDEL
Participants and Euroclear Participants may not deliver instructions directly to
the Foreign Agency Depositaries.
 
     Because of time-zone difference, credits of securities received in CEDEL or
Euroclear as a result of a transaction with a DTC Participant will be made
during subsequent securities settlement processing and dated the business day
following the DTC settlement date. Such credits or any transactions in such
securities settled during such processing will be reported to the relevant
Euroclear or CEDEL Participant on such business day. Cash received in CEDEL or
Euroclear as a result of sales of securities by or through a CEDEL Participant
or a Euroclear Participant to a DTC Participant will be received with value on
the DTC settlement date but will be available in the relevant CEDEL or Euroclear
cash account only as of the business day following settlement in DTC. For
additional information regarding clearance and settlement procedures for the
Offered Certificates, see Annex I hereto, and for information with respect to
tax documentation procedures relating to the Offered Certificates, see Annex I
hereto and "Federal Income Tax Matters -- Foreign Holders."
 
     DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York UCC and a "clearing agency" registered pursuant to the
provisions of Section 17A of the Exchange Act. DTC was created to hold
securities for its participating organizations ("Participants") and facilitate
the clearance and settlement of securities transactions between Participants
through electronic book-entry changes in their accounts, thereby eliminating the
need for physical movement of certificates. Participants include securities
brokers and dealers, banks, trust companies and clearing corporations and may
include certain other organizations (including underwriters involved in the
distribution of the Offered Certificates). DTC is owned by a number of its
Participants and by the New York Stock Exchange, Inc., the American Stock
Exchange, Inc. and the National Association of Securities Dealers, Inc. Indirect
access to the DTC system also is available to others such as banks, brokers,
dealers and trust companies that clear through or maintain a custodial
relationship with a Participant, either directly or indirectly ("Indirect
Participants").
 
     Offered Certificateholders that are not Participants or Indirect
Participants but desire to purchase, sell or otherwise transfer ownership of, or
other interests in, Offered Certificates may do so only through Participants and
Indirect Participants. In addition, Offered Certificateholders will receive all
distributions of principal of and interest on the Offered Certificates from the
Master Trust Trustee through DTC and its Participants. Under a book-entry
format, Offered Certificateholders will receive payments after the related
Distribution Date because, while payments are required to be forwarded to Cede,
as nominee for DTC, on each such date, DTC will forward such payments to its
Participants which thereafter will be required to forward them to
 
                                       43
<PAGE>   60
 
Indirect Participants or Offered Certificateholders. It is anticipated that the
only "Investor Certificateholder" (as such term is used in the Pooling and
Servicing Agreement) will be Cede, as nominee of DTC, and that Offered
Certificateholders will not be recognized by the Master Trust Trustee as
Investor Certificateholders under the Pooling and Servicing Agreement. Offered
Certificateholders will only be permitted to exercise the rights of Investor
Certificateholders under the Pooling and Servicing Agreement indirectly through
DTC and its Participants who in turn will exercise their rights through DTC.
 
     Under the rules, regulations and procedures creating and affecting DTC and
its operations, DTC is required to make book-entry transfers among Participants
on whose behalf it acts with respect to the Offered Certificates and is required
to receive and transmit distributions of principal of and interest on the
Offered Certificates. Participants and Indirect Participants with which Offered
Certificateholders have accounts with respect to the Offered Certificates
similarly are required to make book-entry transfers and receive and transmit
such payments on behalf of their respective Offered Certificateholders. Because
DTC can only act on behalf of Participants, who in turn act on behalf of
Indirect Participants and certain banks, the ability of an Offered
Certificateholder to pledge Offered Certificates to persons or entities that do
not participate in the DTC system, or otherwise take actions in respect of such
Offered Certificates, may be limited due to the lack of a physical certificate
for such Offered Certificates.
 
     DTC has advised the Seller that it will take any action permitted to be
taken by an Offered Certificateholder under the Pooling and Servicing Agreement
only at the direction of one or more Participants to whose account with DTC the
Offered Certificates are credited. DTC may take conflicting actions with respect
to an undivided interest held by a Participant to the extent that it is directed
to do so by such Participant based on such Participant's instructions from
various beneficial owners.
 
     Cedel Bank, societe anonyme ("CEDEL"), 67 Bd Grande-Duchesse Charlotte,
L-1331, Luxembourg, was incorporated in 1970 as a limited company under
Luxembourg law. CEDEL is owned by a parent corporation, Cedel International,
societe anonyme, the shareholders of which are banks, securities dealers and
financial institutions. Cedel International currently has about 100
shareholders, including U.S. financial institutions or their subsidiaries. No
single entity may own more than five percent of Cedel International's stock.
CEDEL is registered as a bank in Luxembourg, and as such is subject to
regulation by the Institut Monetaire Luxembourgeous, the Luxembourg Monetary
Authority, which supervises Luxembourg banks. CEDEL provides clearance and
settlement services for its customers and currently accepts over 70,000
securities issues for clearance, settlement, and custody. CEDEL's customers
consist of broker-dealers, financial institutions, and other securities
professionals involved in the movement and/or custody of securities. CEDEL's
U.S. customers are limited to brokers, dealers, and banks. Currently, CEDEL has
approximately 3000 customers located in over 60 countries, including all major
European countries, Canada and the United States.
 
     The Euroclear System was created in 1968 to hold securities for
participants of the Euroclear System ("Euroclear Participants") and to clear and
settle transactions between Euroclear Participants through simultaneous
electronic book-entry delivery against payment, thereby eliminating the need or
physical movement of certificates and any risk from lack of simultaneous
transfers of securities and cash. Transactions may now be settled in any of 30
currencies, including United States dollars. The Euroclear System includes
various other services, including securities lending and borrowing, and
interfaces with domestic markets in several countries generally similar to the
arrangements for cross-market transfers with DTC described above. The Euroclear
System is operated by Morgan Guaranty Trust Company of New York, Brussels,
Belgium office (the "Euroclear Operator" or "Euroclear"), under contract with
Euroclear S.C., a Belgian cooperative corporation (the "Cooperative"). All
operations are conducted by the Euroclear Operator, and all Euroclear securities
clearance accounts and Euroclear Clearance System cash accounts are accounts
with the Euroclear Operator, not the Cooperative. The Cooperative establishes
policy for the Euroclear System on behalf of Euroclear Participants. Euroclear
Participants include banks (including central banks), securities brokers and
dealers and other professional financial intermediaries and may include any
underwriters, agents or dealers involved in the distribution of the Offered
Certificates. Indirect access to the Euroclear System is also available to other
firms that clear through or maintain a custodial relationship with a Euroclear
Participant, either directly or indirectly.
 
                                       44
<PAGE>   61
 
     The Euroclear Operator is the Belgian branch of a New York banking
corporation which is a member bank of the Federal Reserve System. As such, it is
regulated and examined by the Board of Governors of the Federal Reserve System
and the New York State Banking Department, as well as the Belgian Banking
Commission.
 
     Securities clearance accounts and cash accounts with the Euroclear Operator
are governed by the Terms and Conditions Governing Use of Euroclear and the
related Operative Procedures of the Euroclear System, and applicable Belgian law
(collectively, the "Terms and Conditions"). The Terms and Conditions govern
transfers of securities and cash within the Euroclear System, withdrawals of
securities and cash from the Euroclear System, and receipts of payments with
respect to securities in the Euroclear System. All securities in the Euroclear
System are held on a fungible basis without attribution of specific certificates
to specific securities clearance accounts. The Euroclear Operator acts under the
Terms and Conditions only on behalf of Euroclear Participants, and has no record
of or relationship with persons holding through Euroclear Participants.
 
     Distributions with respect to Offered Certificates held through CEDEL or
Euroclear will be credited to the cash accounts of CEDEL Participants or
Euroclear Participants in accordance with the relevant system's rules and
procedures, to the extent received by its Foreign Agency Depositary. Such
distributions will be subject to tax reporting in accordance with relevant
United States tax laws and regulations. See "Federal Income Tax Matters." CEDEL
or the Euroclear Operator, as the case may be, will take any other action
permitted to be taken by an Investor Certificateholder under the Pooling and
Servicing Agreement or the Supplement related to the Offered Certificates on
behalf of a CEDEL Participant or Euroclear Participant only in accordance with
its relevant rules and procedures and subject to its Foreign Agency Depositary's
ability to effect such actions on its behalf through DTC.
 
     Although DTC, CEDEL and Euroclear have agreed to the foregoing procedures
in order to facilitate transfers of Offered Certificates among participants of
DTC, CEDEL and Euroclear, they are under no obligation to perform or continue to
perform such procedures and such procedures may be discontinued at any time.
 
DEFINITIVE CERTIFICATES
 
     The Offered Certificates will be issued in fully registered, certificated
form to Offered Certificateholders or their nominees ("Definitive
Certificates"), rather than to DTC or its nominee only if (a) the Seller advises
the Master Trust Trustee in writing that DTC is no longer willing or able to
properly discharge its responsibilities under the depository agreement with
respect to the Offered Certificates, and the Master Trust Trustee or the Seller
is unable to locate a qualified successor, (b) the Seller, at its option, elects
to terminate the book-entry system through DTC or (c) after the occurrence of a
Master Trust Servicer Termination Event or a 1990 Trust Servicer Termination
Event (any such event, a "Servicer Termination Event"), Offered
Certificateholders representing beneficial interests aggregating not less a
majority of the Invested Amount advise the Master Trust Trustee and DTC through
Participants in writing that the continuation of a book-entry system through DTC
(or a successor thereto) is no longer in the best interests of the such Offered
Certificateholders.
 
     Upon the occurrence of any of the events described in the immediately
preceding paragraph, DTC is required to notify all Participants of the
availability through DTC of Definitive Certificates for the Offered
Certificates. Upon surrender by DTC of the certificate or certificates
representing the Offered Certificates, accompanied by instructions for
re-registration, the Master Trust Trustee will issue the Offered Certificates in
the form of Definitive Certificates, and thereafter the Master Trust Trustee
will recognize each holder of a Definitive Certificate as an Investor
Certificateholder under the Pooling and Servicing Agreement. In the event that
Definitive Certificates are issued or DTC ceases to be the clearing agency for
the Offered Certificates, the Pooling and Servicing Agreement provides that the
Offered Certificateholders will be notified of such event.
 
     Upon the issuance of Definitive Certificates, distributions of principal
and Monthly Interest will be made by the Master Trust Trustee directly to the
holders of Definitive Certificates in accordance with the
 
                                       45
<PAGE>   62
 
procedures set forth herein and in the Pooling and Servicing Agreement. Payments
of principal, if any, and Monthly Interest on each Distribution Date will be
made to holders in whose names the Definitive Certificates were registered at
the close of business on the related Record Date. Distributions will be made by
check mailed to the address of such holder as it appears on the register
maintained by the Master Trust Trustee. The final payment on any Offered
Certificate (whether Definitive Certificates or Book-Entry Certificates),
however, will be made only upon presentation and surrender of such Offered
Certificate at the office or agency specified in the notice of final
distribution to Offered Certificateholders. The Master Trust Trustee will
provide such notice to registered Offered Certificateholders not later than the
Determination Date of the month of such final payment.
 
          "Determination Date" means, with respect to any Due Period, the
     twelfth day of each calendar month next following the end of such Due
     Period, or if such twelfth day is not a Business Day, the next Business Day
     thereafter.
 
     Definitive Certificates will be transferable and exchangeable at the
offices of the Master Trust Trustee, or at such other office as the Seller shall
designate (initially the Corporate Trust Office). No service charge will be
imposed for any registration of transfer or exchange, but the transfer agent may
require payment of a sum sufficient to cover any tax or other governmental
charge imposed in connection therewith.
 
THE MASTER TRUST SELLER'S CERTIFICATES
 
     The Pooling and Servicing Agreement provides that the Seller may exchange
one or more portions of the certificate evidencing the Master Trust Seller's
Interest (the "NFSC Certificate") for one or more certificates (each, a
"Supplemental Certificate" and together with the NFSC Certificate the "Master
Trust Seller's Certificates") for transfer or assignment upon the execution and
delivery of a Supplement to the Pooling and Servicing Agreement (which
Supplement shall be subject to the amendment section of the Pooling and
Servicing Agreement to the extent that it amends any of the terms of the Pooling
and Servicing Agreement) so long as (a) the Seller shall have delivered to the
Master Trust Trustee and any Enhancement Provider a Tax Opinion with respect to
such exchange and (b) the Rating Agency Condition shall have been satisfied. Any
subsequent transfer or assignment of a Supplemental Certificate is also subject
to the conditions described in the preceding sentence. Upon satisfaction of the
foregoing conditions, the Seller may exchange the NFSC Certificate for one or
more Supplemental Certificates in order to transfer a portion of the Master
Trust Seller's Interest, to facilitate the issuance of a new Series, or for any
other reason. If any Supplemental Certificates are issued, allocations to the
Master Trust Seller's Interest as described herein will include amounts
subsequently allocated between the holder of the NFSC Certificate and the
holders of any Supplemental Certificates.
 
NEW ISSUANCES
 
     The Pooling and Servicing Agreement provides that the Master Trust Trustee
will issue two types of certificates: (a) one or more Series of investor
certificates (including the Offered Certificates) which are transferable and
have the characteristics described below and (b) the Master Trust Seller's
Certificates. The Pooling and Servicing Agreement also provides that, pursuant
to one or more Supplements, the Seller may cause the Master Trust Trustee to
issue one or more new Series. Under the Pooling and Servicing Agreement, the
Seller may specify, among other things, the Principal Terms with respect to any
Series. The Seller may offer any Series to the public under a Disclosure
Document in transactions either registered under the Securities Act or exempt
from registration thereunder, directly or through one or more underwriters or
placement agents. There is no limit to the number of Series that may be issued
under the Pooling and Servicing Agreement.
 
     The Pooling and Servicing Agreement provides that the Seller may specify
Principal Terms of a new Series such that each Series has an amortization period
or accumulation period which may have a different length and begin on a
different date than the amortization period or accumulation period for any other
Series. Further, one or more Series may be in their early amortization periods
or accumulation periods while other Series are not. Thus, certain Series may be
amortizing or accumulating principal, while other Series are not.
 
                                       46
<PAGE>   63
 
Moreover, different Series may have the benefits of letters of credit, surety
bonds, cash collateral accounts, collateral invested amounts, spread accounts,
guaranteed rate agreements, liquidity facilities, tax protection agreements,
interest rate swap agreements or other similar arrangements (each, an
"Enhancement") which may be issued by different entities. Under the Pooling and
Servicing Agreement, the Master Trust Trustee will hold each form of Enhancement
only on behalf of the Series (or a particular class within a Series) with
respect to which it relates. The Pooling and Servicing Agreement also provides
that the Seller may specify different series certificate rates and monthly
servicing fees with respect to each Series (or a particular class within a
Series). In addition, the Seller has the option under the Pooling and Servicing
Agreement to vary among Series (or classes within a Series) the terms upon which
a Series (or classes within a Series) may be repurchased by the Seller.
 
     "Principal Terms" means, with respect to any Series, the principal terms of
such Series, which may include without limitation: (a) the name or designation;
(b) the initial principal amount (or method for calculating such amount or, with
respect to any variable funding certificate, variations in principal amount);
(c) the rate of interest thereon (or method for the determination thereof); (d)
the payment date or dates and the date or dates from which interest shall
accrue; (e) the method of allocating Collections to Certificateholders; (f) the
designation of any Series Accounts and the terms governing the operation of any
such Series Accounts; (g) the amount of the Servicing Fee allocable to such
Series and the Certificateholders' portion thereof; (h) the issuer and terms of
any form of Enhancement with respect thereto; (i) the terms of which the
investor certificates of such Series may be exchanged for investor certificates
of another Series, repurchased by the Seller or remarketed to other investors;
(j) the series termination date for such Series; (k) the number of classes of
investor certificates of such Series and, if more than one class, the rights and
priorities of each such class; (l) the extent to which the investor certificates
of such Series will be issuable in temporary or permanent global form (and, in
such case, the depositary for such global certificate or certificates, the terms
and conditions, if any, upon which such global certificate may be exchanged, in
whole or in part, for Definitive Certificates, and the manner in which any
interest payable on a temporary or global certificate will be paid); (m) whether
the investor certificates of such Series may be issued in bearer form and any
limitations imposed thereon; (n) the priority of such Series with respect to any
other Series; (o) whether such Series will be prefunded; and (p) any other terms
of such Series.
 
     Under the Pooling and Servicing Agreement and pursuant to a Supplement, a
new Series may be issued only upon the satisfaction of certain specified
conditions. The Seller may cause the issuance of a new Series by notifying the
Master Trust Trustee at least five business days in advance of the date on which
such Series will be issued (with respect to any such Series, the "Series
Issuance Date"). The notice shall state the designation of any Series (and
classes within a Series, if any). The Pooling and Servicing Agreement provides
that the Master Trust Trustee will issue any such Series only upon delivery to
it of the following: (i) a Supplement in form satisfactory to the Master Trust
Trustee signed by the Seller and the Servicer and specifying the Principal Terms
of such Series, (ii) the form of any Enhancement and any related agreement,
(iii) an opinion of counsel to the effect that, for federal income tax purposes,
(x) such issuance will not adversely affect the characterization of the
certificates of any outstanding Series (including the Offered Certificates) (or
class within a Series) either as debt or as a partnership interest, (y) such
issuance will not cause a taxable event to any Certificateholder (including the
Offered Certificateholders) or cause the Master Trust to be treated as an
association (or publicly traded partnership) taxable as a corporation (an
opinion of counsel to the effect referred to in clauses (x) and (y) with respect
to any action is referred to herein as a "Tax Opinion") and (z) such new Series
will be characterized as debt or as a partnership interest (other than an
interest in a publicly traded partnership) in the hands of any person other than
the Seller, any affiliate of the Seller or any trust in which the Seller or any
affiliate of the Seller holds an interest, (iv) evidence of satisfaction of the
Rating Agency Condition and (v) evidence that the amount of the Master Trust
Seller's Interest as of such date (after giving effect to such issuance and the
deposit, if any, of proceeds from such issuance in the Excess Funding Account)
will not be less than the Minimum Master Trust Seller's Interest. Such proceeds
will be deposited in the Excess Funding Account as contemplated by clause (v) if
the principal balance of Dealer Notes at the time of such new issuance is less
than the sum of the Master Trust Invested Amount and the Minimum Master Trust
Seller's Interest and would constitute, in effect, a "pre-funding" pending an
increase in the available amount of Dealer Notes. Such issuance is also subject
to the condition that the Seller shall
 
                                       47
<PAGE>   64
 
have represented and warranted that such issuance shall not, in the reasonable
belief of the Seller, cause an Early Amortization Event or Investment Event to
occur. In addition, prior to the 1990 Trust Termination Date, it is a condition
precedent to the issuance of a new Series that the Master Trust Trustee shall
have received a newly issued 1990 Trust Investor Certificate and 1990 Trust
Seller Certificate. Upon satisfaction of all such conditions, the Master Trust
Trustee will issue such Series.
 
TRANSFER OF DEALER NOTES TO THE ACTIVE TRUST
 
     Each business day since December 27, 1990, the Servicer has acquired, on
behalf of the 1990 Trust, Eligible Dealer Notes from the Seller for an
acquisition price equal to the aggregate principal amount of such Dealer Notes
plus accrued and unpaid finance charges thereon for the current Due Period, if
any (each such acquisition, an "Acquisition"). Subject to the availability of
new Eligible Dealer Notes, the Servicer will continue to make Acquisitions on
each business day on and after the Closing Date on behalf of the 1990 Trust
during its term as Active Trust except upon the occurrence of certain bankruptcy
events involving the Seller, NFC, NITC or NIC. Effective as of the 1990 Trust
Termination Date, the Seller shall assign Eligible Dealer Notes ("Assignments")
on each business day to the Servicer on behalf of the Master Trust during its
term as the Active Trust except upon the occurrence of a bankruptcy event
involving the Seller, NFC, NITC or NIC. The Servicer has delivered to the 1990
Trust Trustee, and will continue to deliver to the 1990 Trust Trustee (during
the period prior to the 1990 Trust Termination Date) or the Master Trust Trustee
(during the period after the 1990 Trust Termination Date) (the operative trustee
during any such period being referred to herein as the "Active Trustee") a
computer file, hard copy or microfiche list which shall contain a true and
complete list of all Dealer Notes acquired on each business day, which shall be
deemed to be an amendment as of such business day to the computer file, hard
copy or microfiche list delivered to the Active Trustee containing a true and
complete list of outstanding Dealer Notes conveyed to the Active Trust.
 
ELIGIBLE DEALER NOTES
 
     The Seller obtains from NFC only those Dealer Notes that are identified by
the Servicer as Eligible Dealer Notes. The Seller in turn conveys such Eligible
Dealer Notes to the Active Trust (see "Description of Offered Certificates --
Transfer of Dealer Notes to the Active Trust)." In certain circumstances, the
Seller may be required to repurchase (a) those Dealer Notes previously
transferred to the Active Trust which are Ineligible Dealer Notes from the
Active Trust and (b) in the event that a material amount of Dealer Notes are
Ineligible Dealer Notes, (i) prior to the 1990 Trust Termination Date, all
classes of 1990 Trust Investor Certificates (in which case an Investment Event
or Early Amortization Event would occur) or (ii) after the 1990 Trust
Termination Date, the interests in the Master Trust of the Certificateholders of
all outstanding Series (the "Certificateholders' Interest"), from the holders
thereof (see "Description of Offered Certificates -- Certain Representations and
Warranties; Ineligible Dealer Notes; Purchase of Certificateholders' Interest").
 
          An "Eligible Dealer Note" is any Dealer Note: (a) which is payable in
     United States dollars; (b) which was created in compliance with all
     requirements of law the failure with which to comply would have a material
     adverse effect on Certificateholders; (c) with respect to which all
     consents or authorizations of, or registrations with, any Governmental
     Authority required to be obtained in connection with (i) the creation of
     such Dealer Note or the Dealer Agreement, or (ii) the execution, delivery
     and performance by any Person who sells OEM Vehicles to a Dealer and who
     has entered into an agreement for the benefit of NFC to repurchase new
     vehicle inventory from NFC upon NFC's foreclosure upon such inventory owned
     by such Dealer (subject to such customary conditions and limitations as are
     acceptable to NFC) (an "OEM Supplier") or by NITC of the Dealer Agreement
     pursuant to which such Dealer Note was created, have been duly obtained,
     and are in full force and effect as of such date of creation; (d) as to
     which at all times following the transfer of such Dealer Note to the Active
     Trust, the Active Trust will have good and marketable title thereto free
     and clear of all liens arising prior to the transfer or arising at any time
     under or through any member of Navistar International Corporation, a
     Delaware corporation, ("NIC"), NITC, NFC, NFSC and any other direct or
     indirect subsidiaries of NIC (the "Navistar Group"); (e) which will at all
     times be the legal, valid and binding
 
                                       48
<PAGE>   65
 
     payment obligation of the Dealer obligated thereunder, enforceable against
     such Dealer in accordance with its terms, except as such enforceability may
     be limited by applicable bankruptcy or other similar laws, and except as
     such enforceability may be limited by general principles of equity; (f)
     which constitutes either an "account," "chattel paper" or a "general
     intangible" under and as defined in Article 9 of the Uniform Commercial
     Code; (g) which is not subject to any right of rescission, setoff,
     counterclaim or any other defense (including defenses arising out of
     violations of usury laws) of the Dealer, other than defenses arising out of
     applicable bankruptcy or other similar laws, and except as such
     enforceability may be limited by general principles of equity; (h) as to
     which, at the time of transfer of such Dealer Note to the Active Trust, the
     Servicer has satisfied its obligations with respect to such Dealer Note;
     (i) as to which, at the time of transfer of such Dealer Note to the Active
     Trust, the Servicer has not taken nor failed to take any action which would
     impair the rights of the Active Trust or the holders of interests therein;
     (j) which, at the time of transfer of such Dealer Note to the Active Trust,
     has not been issued by a Dealer that is insolvent; (k) which, at the time
     of transfer by NFSC of such Dealer Note to the Active Trust, has not been
     issued by a Dealer that has been placed on cash-on-delivery terms by the
     Servicer; (l) which, at the time of transfer by NFSC of such Dealer Note to
     the Active Trust, is not past due over thirty days; (m) which has not been
     issued by a Dealer in connection with such Dealer's purchase of parts from
     NITC or an OEM Supplier; (n) which, when the principal amount of such
     Dealer Note is added to the principal amount of the other outstanding
     Dealer Notes issued by the same Dealer previously or concurrently
     transferred to the Active Trust, shall not cause the sum of the principal
     amounts of all such Dealer Notes to exceed the applicable Concentration
     Limit as of the close of business on the business day preceding the date on
     which such Dealer Note is to be transferred; (o) which, in the case of a
     Dealer Note financing an OEM Vehicle (an "OEM Note"), when the principal
     amount of such OEM Note is added to the principal amount of the other
     outstanding OEM Notes previously transferred to the Active Trust, shall not
     cause the sum of such principal amounts to exceed 10% (or any larger
     percentage as to which the Rating Agency Condition has been satisfied) of
     the sum of the aggregate principal balance of Dealer Notes and the
     aggregate principal amount of 1990 Trust Investment Securities (or funds on
     deposit in the Excess Funding Account) in the Active Trust; (p) as to which
     a valid first priority security interest in the Financed Vehicle has been
     transferred to the Active Trust; (q) as to which the Navistar Group has
     assigned to the Active Trust designation as loss payee on the insurance
     policies insuring the Financed Vehicle against casualty and theft losses;
     (r) the principal amount of which is due upon the sale of the related
     Financed Vehicle; (s) the interest rate of which (i) is based on the prime
     rate or another benchmark floating interest rate and (ii) is subject to
     adjustment at least monthly; (t) the principal amount of which (i) in the
     case of a Financed Vehicle which is a new vehicle, is equal to not more
     than one hundred percent of the invoice price of such Financed Vehicle,
     (ii) in the case of a Financed Vehicle which is a used vehicle purchased by
     a Dealer from a NITC Used Truck Center or a repossessed vehicle purchased
     from NFC, is equal to not more than one hundred percent of the agreed upon
     purchase price, and (iii) in the case of a Financed Vehicle which is a used
     vehicle taken in trade by a Dealer or purchased by a Dealer from outside
     sources, is equal to not more than seventy-five percent of the "as is"
     value of such Financed Vehicle as determined by NFC's appraisal thereof;
     (u) which was created in accordance with the standard practice of the
     Navistar Group; and (v) which finances a new medium or heavy-duty truck,
     bus or trailer produced by or for a member of the Navistar Group or an OEM
     Supplier or a used medium or heavy-duty truck, bus or trailer.
 
CERTAIN REPRESENTATIONS AND WARRANTIES; INELIGIBLE DEALER NOTES; PURCHASE OF
CERTIFICATEHOLDERS' INTEREST
 
     The Seller has made and will make certain representations and warranties to
the Active Trust (as of the date of the Applicable Agreement, as of the Closing
Date, and as of the date of any Acquisition or Assignment, as the case may be)
relating to the Applicable Agreement and the Dealer Notes to the effect, among
other things, that (a) each Dealer Note existing on the date of any Acquisition
or Assignment was or will have been conveyed to the Active Trust free and clear
of any lien (excluding certain permitted liens), (b) all appropriate consents
and governmental authorizations required to be obtained by the Seller in
connection with the transfer of such Dealer Notes to the Active Trust have been
obtained, (c) the Applicable Agreement or the Acquisition or Assignment, as the
case may be, constitutes either a valid transfer and
 
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<PAGE>   66
 
assignment of the Seller's right, title, and interest in the Dealer Notes and
the proceeds thereof, or a grant of a first priority perfected "security
interest" (as such term is defined in the Uniform Commercial Code) in such
property to the Active Trust and (d) as of the date of any Acquisition or
Assignment, the Seller is not insolvent. The Seller will not be required to
remake such representations and warranties on the 1990 Trust Termination Date
with respect to Dealer Notes previously transferred to the 1990 Trust, but any
repurchase obligations under the 1990 Trust Agreement with respect to any such
Dealer Notes will survive for the benefit of the Master Trust.
 
     These representations and warranties survive the transfer of the Dealer
Notes to the Active Trust. In the event of a breach with respect to a Dealer
Note of any representations and warranties set forth in (a) above or in the
event that any Dealer Note is not an Eligible Dealer Note as a result of the
failure to satisfy certain eligibility requirements (as specified in the
Applicable Agreement), each such Dealer Note will be automatically removed from
the Active Trust on the terms and conditions described in the following
paragraph. In the event of a breach of any representations and warranties
described in (b), (c) or (d) in the preceding paragraph or in the event that any
Dealer Note is an not an Eligible Dealer Note as a result of the failure to
satisfy certain other eligibility requirements (as specified in the Applicable
Agreement), and as a result of such breach or event the Active Trust's rights to
such Dealer Notes are impaired, then in the event such breach or event is not
cured within a specified period, each such Dealer Note will be removed from the
Active Trust on the terms and conditions described in the following paragraph.
 
     When removal of a Dealer Note is required pursuant to the terms described
in the preceding paragraph (any such Dealer Note being an "Ineligible Dealer
Note"), such Ineligible Dealer Note will be automatically removed from the
Active Trust and the principal balance of such Ineligible Dealer Note will be
deducted from the prior principal balance of Dealer Notes in the Active Trust.
The Seller will deposit in the Collections Account within two business days of
its removal an amount equal to the principal amount of such Ineligible Dealer
Note plus accrued but unpaid finance charges thereon. Such deposit will be
considered a payment in full of the Ineligible Dealer Note and will be applied
as Principal Collections. Upon each removal of an Ineligible Dealer Note from
the Active Trust, the Active Trustee will be deemed to transfer to the Seller,
without recourse, representation or warranty (except for the warranty that since
the date of transfer by the Seller under the Applicable Agreement the Active
Trustee has not sold, transferred, or encumbered such Ineligible Dealer Note),
all right, title, and interest of the Master Trust in and to such Ineligible
Dealer Note and all proceeds thereof. The provisions described in this paragraph
and the immediately preceding paragraph will constitute the sole remedy for any
breach of the representations and warranties described above.
 
     The Seller also has made and will make representations and warranties to
the 1990 Trust and the Master Trust to the effect, among other things, that as
of the date of the Applicable Agreement and any Supplement (including the date
of the Supplement for the Offered Series), and the date of any Acquisition or
Assignment (including the 1990 Trust Termination Date), as the case may be, (a)
the 1990 Trust Agreement (and any Supplement thereto) constitutes a legal, valid
and binding obligation of the Seller (but only to the extent that the date of
any such representation and warranty occurs prior to the 1990 Trust Termination
Date), (b) the Pooling and Servicing Agreement and any Supplement (including the
Offered Series Supplement) constitutes a legal, valid and binding obligation of
the Seller, (c) each Acquisition and Assignment constitutes a legal, valid and
binding obligation of the Seller and (d) Schedule 1 or any update thereto, as
the case may be, is and will be an accurate and complete listing in all material
respects of all Dealer Notes as of the Closing Date, each Series Issuance Date,
the 1990 Trust Termination Date, and the date of Acquisition or Assignment, as
the case may be. Each such representation and warranty survives the transfer of
the Dealer Notes to the Active Trust.
 
     In the event of any breach of any of the representations and warranties
described in the immediately preceding paragraph or if a material amount of
Dealer Notes are Ineligible Dealer Notes, and (i) prior to the 1990 Trust
Termination Date such event has a material adverse effect on the holders of 1990
Trust Investor Certificates (including the Master Trust as holder of the Related
1990 Certificate), either the 1990 Trust Trustee, or the holders of 1990 Trust
Investor Certificates evidencing fractional undivided interests aggregating more
than 50% of sum of the Class Investor Interest of all outstanding classes of
1990 Trust Investor Certificates (the "1990 Trust Total Investor Interest"), by
written notice to the Seller (and to the 1990 Trust
 
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<PAGE>   67
 
Trustee and the Servicer if given by the holders of 1990 Trust Investor
Certificates), may direct the Seller to purchase all outstanding classes of 1990
Trust Investor Certificates within 60 days of such notice, or within such longer
period as may be specified in such notice or (ii) after the 1990 Trust
Termination Date such event has a material adverse effect on the
Certificateholders, either the Master Trust Trustee or Certificateholders
evidencing not less than a majority of the series invested amount for all
outstanding Series, by written notice to the Seller (and to the Master Trust
Trustee and the Servicer if given by the Certificateholders), may direct the
Seller to purchase the Certificateholders' Interest within 60 days of such
notice, or within such longer period as may be specified in such notice in each
case. The Seller will be obligated to make such purchase on a Distribution Date
occurring within such period on the terms and conditions described below.
 
     Prior to the 1990 Trust Termination Date, the Seller will deposit in the
1990 Trust Collections Account on a Transfer Date occurring within such period
the purchase price for the 1990 Trust Investor Certificates, which will equal
the 1990 Trust Total Investor Interest preceding the date such deposit is made
plus an amount equal to all accrued but unpaid 1990 Trust Investor Certificate
Interest. Payment of such purchase price will be considered a prepayment in full
of the Dealer Notes in the 1990 Trust. If the 1990 Trust Trustee or the holders
of 1990 Trust Investor Certificates give notice directing the Seller to purchase
the 1990 Trust Investor Certificates as provided above, the obligation of the
Seller to purchase the 1990 Trust Investor Certificates pursuant to this
paragraph will constitute the sole remedy respecting an event of the type
specified in the first sentence of the preceding paragraph available to the
holders of 1990 Trust Investor Certificates (including the Master Trust as
holder of the Related 1990 Certificate), and an Investment Event or Early
Amortization Event would occur under the Master Trust.
 
     After the 1990 Trust Termination Date, in the event of any such breach, an
Investment Event or Early Amortization Event will occur and, upon receipt of the
notice described above, the Seller will deposit in the Collections Account on a
Transfer Date occurring within such period the purchase price for each
outstanding Series of certificates, which, with respect to the Offered Series,
will equal the Invested Amount plus all accrued interest thereon. The purchase
price payable with respect to the Offered Certificates will be allocated to the
Offered Series and deposited in and held in the Series Principal Account until
the Expected Payment Date in the case of an Investment Event or distributed to
the Offered Certificateholders on the following Distribution Date in the case of
an Early Amortization Event. See "Description of the Offered Certificates --
Investment Events" and "-- Early Amortization Events."
 
     Notwithstanding the foregoing, no purchase pursuant to the provisions
described above will be required, and no Investment Event or Early Amortization
Event will occur under the Master Trust, if during such period the
representations and warranties described above shall be satisfied in all
material respects or there shall no longer be a material amount of Ineligible
Dealer Notes, as the case may be, and any material adverse effect on the holders
of 1990 Trust Investor Certificates or the Certificateholders, as the case may
be, caused thereby shall have been cured.
 
     If an insolvency event occurs with respect to the Seller, NITC, NIC or NFC,
on the day of such insolvency event, the Seller will (subject to the actions of
the Certificateholders) immediately cease to transfer Dealer Notes to the Active
Trust and promptly give notice to the Master Trust Trustee of such insolvency
event. Under the terms of the Pooling and Servicing Agreement, if an insolvency
event occurs with respect to the Seller after the 1990 Trust Termination Date
but prior to the date on which the Series 1995-1 investor certificates issued by
the Master Trust have been paid in full, then within 15 days the Master Trust
Trustee will publish a notice of such insolvency event stating that the Master
Trust Trustee intends to sell, liquidate or otherwise dispose of the Dealer
Notes in a commercially reasonable manner and on commercially reasonable terms,
unless within a specified period of time Certificateholders representing more
than 50% of the aggregate series invested amount of the certificates of each
such Series and each person holding a Supplemental Certificate, instruct the
Master Trust Trustee not to sell, dispose of or otherwise liquidate the Dealer
Notes and to continue transferring Dealer Notes as before such insolvency event.
If the portion of such proceeds allocated to the Offered Certificateholders'
Interest and the proceeds of any collections on the Dealer Notes in the
Collections Account allocable to the Offered Certificateholders' Interest are
not sufficient to pay the unpaid Invested Amount in full plus accrued and unpaid
interest thereon, Offered Certificateholders will incur a loss.
 
                                       51
<PAGE>   68
 
     Neither the 1990 Trust Trustee or the Master Trust Trustee has made, nor is
it required or anticipated that the Active Trustee will make, any initial or
periodic general examination of the Dealer Notes or any records relating to the
Dealer Notes for the purpose of establishing the presence or absence of defects,
compliance with representations and warranties of the Seller or for any other
purpose. In addition, neither the 1990 Trust Trustee or the Master Trust Trustee
has made, nor is it anticipated or required that the Active Trustee will make,
any initial or periodic general examination of the Servicer for the purpose of
establishing the compliance by the Servicer with its representations or
warranties, the observation of its obligations under the 1990 Trust Agreement or
the Pooling and Servicing Agreement, or for any other purpose.
 
DUE PERIODS; DISTRIBUTION PERIODS
 
     Each Applicable Agreement uses the related concepts of "Due Periods" and
"Distribution Periods" as units of time. Each "Due Period" is a calendar month,
beginning on the first day of such month and ending on the last day of such
month. Each Due Period has a related Distribution Date and Distribution Period.
The "Distribution Date" related to a Due Period is the twenty-fifth day of the
calendar month (or, if such day is not a business day, the next business day
thereafter) next following the end of such Due Period. The "Distribution Period"
related to a Due Period is the approximate one-month period which begins on the
preceding Distribution Date and ends on and includes the day immediately
preceding the Distribution Date for such Due Period. Thus, for example, the Due
Period running from July 1, 1997 through July 31, 1997 will have a related
Distribution Date of August 25, 1997 and a related Distribution Period running
from July 25, 1997 through but excluding August 25, 1997.
 
     Finance Charges accrue and are collected with respect to Due Periods.
Interest on each Related 1990 Certificate and Monthly Interest, by contrast,
accrue and are paid with respect to the related Distribution Period. NFC
establishes the interest rate on Dealer Notes for a Due Period on the third
Monday of the preceding month. The rate at which interest accrues on the Related
1990 Certificate, however, is established as of the day which is two London
business days prior to the start of the Distribution Period related to such Due
Period. Similarly, the Applicable Floating Rate payable by the Master Trust to
the Swap Counterparty or the Offered Certificateholders is established as of the
day which is two London business days prior to the start of the Distribution
Period related to such Due Period. As the Distribution Period does not begin
until the twenty-fifth day of the related Due Period, the result is that the
interest rate for Dealer Notes is established more than five weeks prior to the
determination of the interest rate on the Related 1990 Certificate and the
Applicable Floating Rate.
 
          "Finance Charges" means, with respect to any Due Period, Dealer
     Finance Charges and NITC Finance Charges for such Due Period.
 
          "Dealer Finance Charges" means, with respect to any Due Period, the
     interest and other finance charges accrued with respect to the Dealer Notes
     during such Due Period and billed by the Servicer on a monthly basis to
     Dealers. Dealer Finance Charges do not include NITC Finance Charges.
 
          "NITC Finance Charges" means, with respect to any Due Period, the sum
     of (a) the amount of Up-Front Interest Credit granted by NITC during such
     Due Period and (b) the amount of Aggregate NITC Earned Interest accrued
     during such Due Period.
 
          "Aggregate NITC Earned Interest" means, with respect to any Due
     Period, the aggregate amount of NITC Earned Interest on all Non-Interest
     Bearing Dealer Notes accrued during such Due Period.
 
ADVANCES
 
     For any Due Period, the Servicer will make an advance (an "Advance") to the
1990 Trust Collections Account or the Collections Account, as the case may be,
of an amount equal to all Dealer Finance Charges for such Due Period which have
not been paid by the Transfer Date (other than Uncollectible Finance Charges)
("Unpaid Dealer Finance Charges"). Once any previously Unpaid Dealer Finance
Charges are paid on the Dealer Notes to which any portion of an Advance relates,
or when the Servicer determines that it will be
 
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<PAGE>   69
 
unable to recover such Unpaid Dealer Finance Charges on the Dealer Notes to
which the portion of the Advance relates, the Servicer will be reimbursed in an
amount equal to such portion of the Advance.
 
          "Uncollectible Finance Charges" means, with respect to any Due Period,
     the amount of Dealer Finance Charges that the Servicer, on or before the
     related Determination Date, determines in its sole discretion will be
     uncollectible.
 
     The reimbursement by the Active Trust to the Servicer of an Advance is
referred to herein as an "Advance Reimbursement." Prior to the 1990 Trust
Termination Date, Advance Reimbursements are funded from Dealer Finance Charge
Collections and NITC Finance Charges before they are allocated for the payment
of 1990 Trust Investor Certificate Interest. After the 1990 Trust Termination
Date, Advance Reimbursements will be funded on each Transfer Date from Dealer
Finance Charge Collections and NITC Finance Charges before Finance Charge
Collections are allocated among the outstanding Series.
 
          "Dealer Finance Charge Collections" means with respect to any Due
     Period the amount of Dealer Finance Charges received from Dealers plus
     Advances for the current Due Period and any Unpaid Dealer Finance Charges
     or Uncollectible Finance Charges from prior Due Periods actually collected
     by the Transfer Date related to such Due Period.
 
THE SERVICER
 
     General. Pursuant to the terms of the Applicable Agreement, the Servicer is
authorized to service and administer the Dealer Notes and collect payments due
under the Dealer Notes in accordance with its customary and usual servicing
procedures. See "The Navistar Financial Dealer Floor Plan Financing Business"
for a description of NFC's customary and usual servicing procedures. In
addition, under each of the 1990 Trust Agreement and the Pooling and Servicing
Agreement (collectively, the "Agreements"), the Servicer is also authorized to
make withdrawals and payments from the various trust accounts under the 1990
Trust and the Master Trust (collectively the "Trusts"). Servicing activities
performed by the Servicer include collecting and recording payments,
communicating with Dealers, monitoring Dealer inventory, investigating payment
delinquencies and maintaining internal records with respect to each Dealer Note.
Managerial and custodial services performed by the Servicer include providing
assistance in any inspections of the documents and records relating to the
Dealer Notes, maintaining the agreements, documents, and files relating to the
Dealer Notes as custodian for the Active Trust, and providing related data
processing and reporting services for holders of 1990 Trust Investor
Certificates (including the Master Trust as holder of the Related 1990
Certificate), the Offered Certificateholders and on behalf of each of the 1990
Trust Trustee and the Master Trust Trustee.
 
     Servicing Compensation and Payment of Expenses. As compensation for its
servicing activities and reimbursement for its expenses under the 1990 Trust
Agreement, the Servicer will be entitled to receive a servicing fee payable in
arrears equal to 1.0% per annum (calculated on the basis of a 360-day year and
twelve 30-day months) of the daily average principal amount of Dealer Notes,
which will be payable by the 1990 Trust monthly in respect of any Due Period on
each Distribution Date (the "1990 Trust Monthly Servicing Fee"). The 1990 Trust
Monthly Servicing Fee is allocable to the holders of 1990 Trust Investor
Certificates for such Due Period in an amount equal to the product of the 1990
Trust Monthly Servicing Fee for the related Due Period and the 1990 Trust Total
Investor Percentage for such Due Period, and the remaining portion of the 1990
Trust Monthly Servicing Fee will be allocable to the 1990 Trust Seller Interest.
 
          "1990 Trust Total Investor Percentage" means, with respect to any Due
     Period, the percentage equivalent of a fraction the numerator of which is
     the 1990 Trust Total Investor Interest at the beginning of such Due Period,
     and the denominator of which is the sum of the 1990 Trust Total Investor
     Interest at the beginning of such Due Period plus a number equal to the
     average daily 1990 Trust Seller Interest calculated for such Due Period.
 
     With respect to each Due Period commencing after the 1990 Trust Termination
Date, the Servicer will be entitled to receive a servicing fee in respect of
each day prior to the termination of the Master Trust, payable in arrears, on
the related Distribution Date. The "Servicing Fee" shall be the aggregate of the
fees
 
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<PAGE>   70
 
payable with respect to all outstanding Series (including the Offered Series).
The portion of the Servicing Fee payable with respect to the Offered Series will
be set forth in the Prospectus Supplement (the "Series Allocable Servicing
Fee"). Unless otherwise specified in the Prospectus Supplement, the Series
Allocable Servicing Fee will be allocated to the Offered Certificateholders
based on the Floating Allocation Percentage (such allocated portion being
referred to herein as the "Offered Series Servicing Fee"); the remainder of the
Series Allocable Servicing Fee will be allocated to the holders of the Master
Trust Seller's Certificates. See "Description of Offered Certificates --
Allocation of Collections After the 1990 Trust Termination Date."
 
     The Servicer is obligated to pay certain expenses incurred in connection
with servicing the Dealer Notes, including expenses related to the payment of
fees and disbursements of the 1990 Trust Trustee and the Master Trust Trustee
(collectively, the "Trustees"), the Special Servicer Agent and independent
accountants and all other fees and expenses of the Trusts not expressly stated
in the Agreements to be for the account of the holders of certificates issued by
the Trusts, other than federal, state, or local income or franchise taxes, if
any, of the Trusts, the Trustees, or such holders. The Servicer will be required
to pay such expenses for its own account and will not be entitled to any payment
therefor other than the 1990 Trust Monthly Servicing Fee or the Servicing Fee,
as the case may be.
 
     Servicer Covenants. Under the terms of the Applicable Agreement, the
Servicer covenants, among other things, that (a) it will not change the Credit
Guidelines, nor will it change its current practices with respect to the
recognition of estimated or actual loss on Dealer Notes (subject in each case to
certain materiality standards), (b) so long as any Series or 1990 Trust Investor
Certificate is outstanding, it will maintain casualty loss insurance on the
Financed Vehicles substantially similar to that maintained by the Servicer on
the Closing Date for the Offered Series and (c) if required to select certain
Dealer Notes from the Dealer Notes issued by a particular Dealer in order to
satisfy the Concentration Limit, it will select such Dealer Notes in a manner
that will not be adverse to the rights of the holders of certificates issued by
the Active Trust.
 
     Certain Matters Regarding the Servicer. NFC may not resign from its
obligations and duties as Servicer under the Agreements, except upon a
determination that such duties are no longer permissible under applicable law.
No such resignation will become effective until the Trustees or a successor
Servicer has assumed the Servicer's responsibilities and obligations under the
Agreements.
 
     Any person into which, in accordance with the Agreements, NFC may be merged
or consolidated or any person resulting from any merger or consolidation to
which NFC is a party, or any person succeeding to the business of NFC, upon
execution of a supplement to each of the Agreements (pursuant to which such
person will assume the rights and obligations of the Servicer under the
Agreements) will be the successor to NFC as the Servicer under the Agreements.
 
     1990 Trust Servicer Termination Event. Prior to the 1990 Trust Termination
Date, in the event of any 1990 Trust Servicer Termination Event and so long as
the 1990 Trust Servicer Termination Event shall not have been remedied, either
the 1990 Trust Trustee or holders of 1990 Trust Investor Certificates evidencing
fractional undivided interests aggregating not less than 51% of the sum of the
Class Invested Amounts for each class of 1990 Trust Investor Certificates
outstanding during the Distribution Period calculated as of the beginning of the
Distribution Period (the "1990 Trust Total Invested Amount"), by written notice
to NFC as Servicer (and to the 1990 Trust Trustee if given by the holders of
1990 Trust Investor Certificates), may terminate all of the rights and
obligations of NFC as Servicer under the 1990 Trust Agreement. If NFC is
terminated as Servicer under the terms of the 1990 Trust Agreement, then NFC
shall automatically be terminated under the Pooling and Servicing Agreement
without any action on the part of the Master Trust Trustee or the
Certificateholders.
 
     After the 1990 Trust Termination Date, in the event of any Master Trust
Servicer Termination Event and for so long as the Master Trust Servicer
Termination Event shall not have been remedied, the Master Trust Trustee, by
written notice to the Servicer, may terminate all of the rights and obligations
of NFC as Servicer under the Pooling and Servicing Agreement.
 
     Upon the occurrence of any such event, the Active Trustee will as promptly
as possible appoint a successor Servicer (to whom all authority and power of the
Servicer under each of the Agreements will pass
 
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<PAGE>   71
 
and be vested in), and, if no successor Servicer has been appointed by the
Active Trustee and accepted its appointment by the time NFC ceases to act as
Servicer, all authority, power, and obligations of NFC as Servicer under the
Agreements will pass to and be vested in the 1990 Trust Trustee with respect to
the 1990 Trust and the Master Trust Trustee with respect to the Master Trust.
 
     A "1990 Trust Servicer Termination Event" refers to any of the following
events which shall occur:
 
          (a) failure by NFC as Servicer to make any payment, transfer or
     deposit, or failure to give instructions to the 1990 Trust Trustee
     regarding the same, on the date it is required to do so under the 1990
     Trust Agreement (or within five business days thereafter);
 
          (b) failure on the part of NFC as Servicer duly to observe or perform
     in any material respect any other covenants or material agreements of the
     Servicer set forth in the 1990 Trust Agreement which continues unremedied
     for a period of 60 days after written notice is received by the Servicer
     from the 1990 Trust Trustee or by the Servicer and the 1990 Trust Trustee
     from the holders of 1990 Trust Investor Certificates evidencing fractional
     undivided interests aggregating not less than 25% of the 1990 Trust Total
     Invested Amount;
 
          (c) any representation, warranty or certification made by NFC as
     Servicer in the 1990 Trust Agreement or in any certificate delivered
     pursuant to the 1990 Trust Agreement proves to have been incorrect when
     made, which has a material adverse effect on the rights of the holders of
     1990 Trust Investor Certificates, and which representation, warranty or
     certification, or the circumstances or condition which caused such
     representation, warranty or certification to be incorrect, continues to be
     incorrect or uncured in any material respect for a period of 60 days after
     written notice is received by the Servicer from the 1990 Trust Trustee or
     by the Servicer and the 1990 Trust Trustee from the holders of 1990 Trust
     Investor Certificates evidencing fractional undivided interests aggregating
     not less than 25% of the 1990 Trust Total Invested Amount; or
 
          (d) the occurrence of certain events of bankruptcy, insolvency or
     receivership of NFC while acting as Servicer under the 1990 Trust
     Agreement.
 
     A "Master Trust Servicer Termination Event" refers to any of the following
events which shall occur:
 
          (a) failure by NFC as Servicer to make any payment, transfer or
     deposit, or failure to give instructions to the Master Trust Trustee
     regarding the same, on the date it is required to do so under the Pooling
     and Servicing Agreement (or within five business days thereafter);
 
          (b) failure on the part of NFC as Servicer duly to observe or perform
     in any material respect any other covenants or material agreements of the
     Servicer set forth in the Pooling and Servicing Agreement which continues
     unremedied for a period of 60 days after written notice is received by the
     Servicer from the Master Trust Trustee;
 
          (c) any representation, warranty or certification made by NFC as
     Servicer in the Pooling and Servicing Agreement or in any certificate
     delivered pursuant to the Pooling and Servicing Agreement proves to have
     been incorrect when made, which has a material adverse effect on the rights
     of the holders of investor certificates, and which representation, warranty
     or certification, or the circumstances or condition which caused such
     representation, warranty or certification to be incorrect, continues to be
     incorrect or uncured in any material respect for a period of 60 days after
     written notice is received by the Servicer from the Master Trust Trustee;
     or
 
          (d) the occurrence of certain events of bankruptcy, insolvency or
     receivership of NFC while acting as Servicer under the Pooling and
     Servicing Agreement.
 
     Upon the occurrence of any 1990 Trust Servicer Termination Event, the
Servicer will give prompt written notice thereof to the 1990 Trust Trustee, and
the 1990 Trust Trustee will give notice to the holders of the 1990 Trust
Investor Certificates. If the Master Trust Trustee receives any such notice in
respect of any 1990 Trust Investor Certificate issued to the Master Trust
(including the Related 1990 Certificate), the Master Trust Trustee will give
notice to the Certificateholders (including the Offered Certificateholders) and
to any
 
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<PAGE>   72
 
Enhancement Provider. Upon any termination or appointment of a successor
Servicer under the 1990 Trust, the 1990 Trust Trustee will give prompt written
notice thereof to the Rating Agencies and to holders of 1990 Trust Investor
Certificates. If the Master Trust Trustee receives any such notice in respect of
any 1990 Trust Investor Certificate issued to the Master Trust (including the
Related 1990 Certificate), the Master Trust Trustee will give notice to the
Certificateholders (including the Offered Certificateholders, the Rating
Agencies then rating such certificates and any Enhancement Provider). Under the
1990 Trust Agreement, the holders of 1990 Trust Investor Certificates evidencing
fractional undivided interests aggregating not less than 51% of the 1990 Trust
Total Invested Amount may, on behalf of all holders of 1990 Trust Investor
Certificates, waive the effect of any 1990 Trust Servicer Termination Event
occurring during such period, except for the failure to make any required
deposits or payments in accordance with the 1990 Trust Agreement.
 
     Upon the occurrence of a Master Trust Servicer Termination Event, the
Servicer will give prompt written notice thereof to the Master Trust Trustee,
and the Master Trust Trustee will give notice to the Certificateholders and to
any Enhancement Provider. Upon any termination or appointment of a successor
Servicer under the Master Trust, the Master Trust Trustee will give prompt
written notice thereof to the Rating Agencies, the Certificateholders, and any
Enhancement Provider. In addition, under the Pooling and Servicing Agreement,
delays in performance for 10 business days with respect to clause (a) above or
60 business days with respect to clauses (b) and (c) above will not constitute a
Master Trust Servicer Termination Event with respect to the Master Trust if such
delay or failure could not be prevented by the exercise of reasonable diligence
by the Servicer and such delay or failure was caused by an act of God or the
public enemy, acts of declared or undeclared war, public disorder, rebellion or
sabotage, epidemics, landslides, lightning, fire, hurricanes, earthquakes,
floods or similar causes. Under the Pooling and Servicing Agreement, the holders
of 1990 Trust Investor Certificates evidencing fractional undivided interests in
the Master Trust aggregating not less than 51% of the Trust Invested Amount may,
on behalf of all holders of Investor Certificates, waive the effect of any
Master Trust Servicer Termination Event occurring during such period, except for
the failure to make any required deposits or payments in accordance with the
Pooling and Servicing Agreement.
 
     Special Servicer Agent. During any Investment Period, funds on deposit in
the Series Principal Account, the Distribution Account, the Liquidity Reserve
Account, the Negative Carry Reserve Fund and the Spread Account will be invested
at the direction of an agent selected by the Servicer, which initially will be
the Master Trust Trustee (the "Special Servicer Agent"), in Eligible Investments
selected by the Special Servicer Agent. The Special Servicer Agent will be
compensated by the Servicer.
 
     The Special Servicer Agent may be removed at any time by the Servicer;
provided that no removal of the Special Servicer Agent shall be effective until
a successor person meeting the criteria and approved as described above shall
have been appointed as the Special Servicer Agent and shall have accepted its
appointment as such and the Rating Agency Condition for the Offered Series shall
have been satisfied.
 
MASTER TRUST ACCOUNTS; OTHER ACCOUNTS FOR THE OFFERED SERIES
 
     The Master Trust Trustee will establish and will maintain two Eligible
Deposit Accounts in the name of the Master Trust Trustee for the benefit of the
Certificateholders, including the Offered Certificateholders (one of which will
be the "Collections Account" and the other of which will be the "Excess Funding
Account"). The Master Trust Trustee will also establish and maintain in the name
of the Master Trust Trustee for the benefit of the Offered Certificateholders
the Series Principal Account, the Spread Account and an Eligible Deposit Account
known as the "Distribution Account" from which distributions to the Offered
Certificateholders will be made.
 
          "Eligible Deposit Account" means either (a) a segregated account with
     an Eligible Institution or (b) a segregated trust account with the
     corporate trust department of a depository institution organized under the
     laws of the United States or any one of the states thereof (or any domestic
     branch of a foreign bank), having corporate trust powers and acting as
     trustee for funds deposited in such account, so long as any of the
     securities of such depository institution has a credit rating from each
     Rating Agency in one of its generic rating categories which signifies
     investment grade.
 
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<PAGE>   73
 
          "Eligible Institution" means (a) the corporate trust department of the
     Master Trust Trustee or (b) a depository institution organized under the
     laws of the United States or any one of the states thereof, or the District
     of Columbia (or a domestic branch of a foreign bank), which at all times
     (i) has either (x) a long-term unsecured debt rating acceptable to the
     Rating Agencies or (y) a short-term unsecured debt rating or certificate of
     deposit rating acceptable to the Rating Agencies and (ii) whose deposits
     are insured by the FDIC.
 
     Funds in the Collections Account, the Excess Funding Account, the
Distribution Account, the Series Principal Account, the Liquidity Reserve
Account and the Spread Account generally will be invested in Eligible
Investments. The Distribution Account, the Series Principal Account, the Spread
Account, the Negative Carry Reserve Fund and the Liquidity Reserve Account are
referred to herein as the "Series Accounts."
 
     The following investments are "Eligible Investments" (except that Eligible
Investments shall not include investments in securities, instruments or
obligations of the Seller, NITC or the Servicer or any of their affiliates,
except as permitted by the Rating Agencies):
 
          (a) book-entry securities, negotiable instruments or securities
     represented by instruments in bearer or registered form having (except in
     the case of clause (iv) below) remaining maturities occurring not later
     than the Distribution Date next succeeding the Master Trust Trustee's
     acquisition thereof, except as otherwise described herein, which evidence:
 
           (i) direct obligations of, and obligations fully guaranteed as to
        timely payment by, the United States of America;
 
             (ii) demand deposits, time deposits or certificates of deposit of,
        or bankers' acceptances issued by, any depositary institution or trust
        company incorporated under the laws of the United States of America or
        any state thereof (or any domestic branch of a foreign bank) and subject
        to supervision and examination by federal or state banking or depository
        institution authorities; provided, however, that at the time of the
        Master Trust's investment or contractual commitment to invest therein,
        the commercial paper or other short-term unsecured debt obligations
        (other than such obligations the rating of which is based on the credit
        of a person or entity other than such depository institution or trust
        company) thereof shall have a credit rating from each of the Rating
        Agencies in the highest investment category granted thereby;
 
             (iii) commercial paper having, at the time of the Master Trust's
        investment or contractual commitment to invest therein, a rating from
        each of the Rating Agencies in the highest investment category granted
        thereby;
 
             (iv) except during an Investment Period, investments in money
        market funds having a rating from each of the Rating Agencies in the
        highest investment category granted thereby or otherwise approved in
        writing thereby;
 
             (v) repurchase obligations (x) with respect to any security that is
        a direct obligation of, or fully guaranteed by, the United States of
        America or any agency or instrumentality thereof the obligations of
        which are backed by the full faith and credit of the United States of
        America, in either case entered into with (A) a depository institution
        or trust company (acting as principal) described in clause (ii) or (B) a
        depository institution or trust company the deposits of which are
        insured by FDIC or (y) the counterparty for which has a rating from each
        of the Rating Agencies in the highest investment category for short-term
        unsecured debt obligations, the collateral for which is held by a
        custodial bank for the benefit of the Trust or the Indenture Trustee, is
        marked to market daily and is maintained in an amount that exceeds the
        amounts of such repurchase obligation, and which requires liquidation of
        the collateral immediately upon the amount of such collateral being less
        than the amount of such repurchase obligation (unless the counterparty
        immediately satisfies the repurchase obligation upon being notified of
        such shortfall); or
 
                                       57
<PAGE>   74
 
             (vi) commercial paper master notes where the issuer has, at the
        time of the Master Trust's investment or contractual commitment to
        invest therein, a rating from each of the Rating Agencies in the highest
        investment category for short-term unsecured debt obligations; and
 
          (b) any other investment consisting of a financial asset that by its
     terms converts to cash within a finite period of time, provided that the
     Rating Agency Condition is satisfied.
 
     Eligible Investments of funds in the Series Principal Account, the Excess
Funding Account, the Negative Carry Reserve Fund and the Liquidity Reserve
Account will be subject to the following additional restrictions: (x) no more
than 20% of the aggregate Eligible Investments in all of such accounts
collectively shall be obligations of or investments in any single issuer (except
that such 20% limitation shall not apply to Eligible Investments of the type
specified in clause (a)(i)) and (y) each Eligible Investment shall be
denominated and be payable solely in U.S. dollars, shall bear interest at a
specified rate that is, or is based upon, London interbank offered rate or a
commercial paper rate, shall entitle the holder to a fixed principal amount at
maturity and shall have a yield that is not inversely or disproportionately
affected by changes in interest rates.
 
          "Rating Agency Condition" means, with respect to any proposed action
     and any outstanding Series, that the Rating Agencies have been informed of
     such proposed action and have notified the Seller and the Master Trust
     Trustee that such action will not result in a reduction or withdrawal of
     their then existing rating of such Series.
 
          "Rating Agencies" means, with respect to any outstanding Series, any
     nationally recognized statistical rating organization then maintaining a
     rating of such Series at the request of the Seller.
 
     Any earnings (net of losses and investment expenses) on funds in the
Collections Account or the Excess Funding Account will be credited to the
Collections Account or the Excess Funding Account, respectively.
 
     The Servicer will have the power to designate specific investments as well
as the revocable power to instruct the Master Trust Trustee to (1) make
withdrawals and payments from the Collections Account and the Excess Funding
Account, (2) make withdrawals from the Series Principal Account and the Spread
Account (and, in accordance with instructions from the Servicer, make deposits
of funds so withdrawn into the Distribution Account or otherwise apply such
funds in accordance with such instructions), and (3) make withdrawals and
distributions from the Distribution Account, in each case for the purpose of
carrying out its duties under the Pooling and Servicing Agreement. The Servicer
may select an appropriate agent as representative of the Servicer for the
purpose of designating such investments. The Servicer is not required to
reimburse the Master Trust for any losses occurring on Eligible Investments.
 
EXCESS FUNDING ACCOUNT
 
     On each business day after the 1990 Trust Termination Date and prior to the
Fully Funded Date, Principal Collections not used for other purposes will be
retained in the Excess Funding Account to the extent necessary to maintain the
Master Trust Seller's Interest at an amount equal to (or, in the discretion of
the Seller, greater than) the Minimum Master Trust Seller's Interest. Funds on
deposit in the Excess Funding Account will be invested in Eligible Investments.
Upon the maturity of Eligible Investments, the proceeds thereof in the Excess
Funding Account shall be treated as Principal Collections.
 
          "Master Trust Seller's Interest" with respect to any business day
     prior to the 1990 Trust Termination Date, the interest of the Seller in the
     Master Trust, and with respect to any business day after the 1990 Trust
     Termination Date will equal the aggregate principal amount of Dealer Notes
     plus the aggregate amount of funds in the Excess Funding Account, plus the
     aggregate amount of funds in all series principal accounts (and funds being
     held for deposit therein), including the Series Principal Account, each as
     of such day, minus the Master Trust Invested Amount on such day (or as of
     the Distribution Date on or immediately preceding such business day).
 
          "Minimum Master Trust Seller's Interest" with respect to any business
     day after the 1990 Trust Termination Date will equal the aggregate of the
     minimum series seller's interest for each outstanding
 
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<PAGE>   75
 
     Series. The minimum series seller's interest for the Offered Series (the
     "Minimum Series Seller's Interest") will be set forth in the Prospectus
     Supplement.
 
NEGATIVE CARRY RESERVE FUND
 
     If and to the extent specified in the Prospectus Supplement, the Master
Trust Trustee will establish and maintain in the name of the Master Trust
Trustee an Eligible Deposit Account for the benefit of the Offered
Certificateholders and the Swap Counterparty (the "Negative Carry Reserve
Fund"). Funds in the Negative Carry Reserve Fund will be invested in Eligible
Investments. On each Transfer Date related to a Due Period commencing prior to
the 1990 Trust Termination Date and occurring during any Investment Period or
any Early Amortization Period, Related 1990 Certificate Collections, Investment
Income and Net Swap Receipts will be deposited in the Negative Carry Reserve
Fund to the extent of the Negative Carry Reserve Fund Deposit Amount as provided
under "-- Allocation of Collections Prior to the 1990 Trust Termination Date."
After the 1990 Trust Termination Date and during the Accumulation Period, any
Investment Period or any Early Amortization Period, Available Seller's Finance
Charge Collections and Available Seller's Principal Collections will be
deposited in the Negative Carry Reserve Fund to the extent of the Negative Carry
Reserve Fund Deposit Amount as provided under "-- Allocation of Collections
After the 1990 Trust Termination Date."
 
          The "Negative Carry Reserve Fund Required Amount" equals (a) for any
     Transfer Date prior to the Fully Funded Date, the amount designated in the
     Prospectus Supplement and (b) for each Transfer Date after the Fully Funded
     Date, zero.
 
          The "Negative Carry Reserve Fund Deposit Amount" equals, for any
     Transfer Date, the excess, if any, of (a) the lesser of (i) the Negative
     Carry Reserve Fund Required Amount for such Transfer Date and (ii) the
     result of (A) the Negative Carry Subordinated Amount as of the end of the
     preceding Transfer Date divided by (B) 1.00 plus the Subordinated
     Percentage over (b) the amount of funds on deposit in the Negative Carry
     Reserve Fund on such Transfer Date (after giving effect to any withdrawals
     therefrom on such date).
 
     The Prospectus Supplement for the Offered Series will specify whether the
terms of the Offered Series will include a Negative Carry Reserve Fund, Negative
Carry Reserve Fund Deposit Amount, Negative Carry Reserve Fund Required Amount
or Negative Carry Subordinated Amount.
 
     Offered Certificateholders will not have any rights to amounts on deposit
in the Negative Carry Reserve Fund or interest income thereon, except as
described herein. Upon the payment in full of the Invested Amount, any funds
remaining on deposit in the Negative Carry Reserve Fund will be paid to the
Seller.
 
INTEREST RATE SWAP
 
     In connection with the issuance of the Offered Certificates, the Master
Trust may enter into an Interest Rate Swap with the Swap Counterparty. The "Swap
Counterparty" and other terms relating to the Interest Rate Swap will be more
fully described in the Prospectus Supplement. If the Master Trust does enter
into an Interest Rate Swap, all terms and provisions described herein relating
to the Interest Rate Swap, including the defined terms "Swap Counterparty,"
"Swap Fixed Rate," "Swap Floating Rate," Swap Receipt," "Swap Payment," "Net
Swap Receipt" and "Net Swap Payment," will apply and be operative. If the Master
Trust does not enter into an Interest Rate Swap, such terms and provisions, as
well as paragraphs (x) and (y) under " -- Allocation of Collections After the
1990 Trust Termination Date -- Available Certificateholder Interest
Collections," will not be operative (unless otherwise specified in the
Prospectus Supplement for the Offered Series).
 
     In accordance with the terms of the Interest Rate Swap, the Swap
Counterparty will be obligated to pay to the Master Trust, not later than each
Distribution Date, interest at a fixed rate per annum (the "Swap Fixed Rate") on
the Invested Amount as of the preceding Distribution Date (after giving effect
to all distributions on such date). In exchange for such payments, the Master
Trust will be obligated to pay to the Swap Counterparty, on each Distribution
Date, interest at a floating rate per annum based on LIBOR (the
 
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<PAGE>   76
 
"Swap Floating Rate") on the Invested Amount as of the preceding Distribution
Date (after giving effect to all distributions on such date). Under the Interest
Rate Swap, the amount the Master Trust is obligated to pay will be netted
against the amount the Swap Counterparty is obligated to pay such that only the
Net Swap Payment will be due from the Master Trust or the Net Swap Receipt will
be due from the Swap Counterparty, as the case may be. Net Swap Receipts (money
owed by the Swap Counterparty) will be paid to the Collections Account not later
than each Distribution Date and distributed in the same manner as Related 1990
Certificate Interest Collections on each Distribution Date related to a Due
Period commencing prior to the 1990 Trust Termination Date, and on each
Distribution Date thereafter in the same manner as Offered Series Finance Charge
Collections, except as otherwise described herein, and Net Swap Payments (money
owed to the Swap Counterparty) will be paid not later than each Distribution
Date out of Related 1990 Certificate Interest Collections and Investment Income
prior to the 1990 Trust Termination Date, and thereafter out of Available
Certificateholder Interest Collections, excess interest collections from other
Series allocable to the Offered Series, Available Draw Funds and withdrawals
from the Negative Carry Reserve Fund to the extent described herein. Net Swap
Payments and Monthly Interest on the Offered Certificates will be paid on a pari
passu basis as described under "-- Distributions to Offered Certificateholders
and the Swap Counterparty." The notional principal amount of the Interest Rate
Swap will be equal to the Invested Amount.
 
1990 TRUST TERMINATION DATE
 
     Prior to the 1990 Trust Termination Date, the principal assets held by the
Master Trust will be the Class A-4 Investor Certificate, each Related 1990
Certificate, any Subsequent 1990 Trust Investor Certificate, any associated
Interest Rate Swap and the 1990 Trust Seller Certificate. Each Related 1990
Certificate will bear interest at a rate intended to provide sufficient cash
flows to make required payments of interest on the Offered Certificates or on an
associated Interest Rate Swap and will have an invested amount intended to be
sufficient, in the event of early amortization of the 1990 Trust, to repay the
Invested Amount on the Offered Certificates or, in the event that such
amortization event constitutes an Investment Period with respect to the Offered
Certificates, to fund the Series Principal Account and the Negative Carry
Reserve Fund. As described in more detail herein, prior to the 1990 Trust
Termination Date the 1990 Trust will be the Active Trust and will hold the
Dealer Notes and certain related assets and receive and allocate the collections
and losses thereon to holders of the 1990 Trust Investor Certificates, including
the Master Trust as holder of each Related 1990 Certificate. During this time,
the Master Trust will be essentially a passive entity in which Collections
received on each Related 1990 Certificate and Net Swap Receipts will be used to
make Net Swap Payments and payments to Certificateholders, including the Offered
Certificateholders.
 
     Following the 1990 Trust Termination Date, the Master Trust will become the
Active Trust. As described in more detail herein, the Dealer Notes and other
assets held by the 1990 Trust will be transferred to the Master Trust, and the
Master Trust will thereafter receive and allocate the Collections thereon to
Certificateholders, including Offered Certificateholders.
 
          "1990 Trust Termination Date" means the close of business on the date,
     which will be given retroactive effect, which is the last day of the Due
     Period related to the Distribution Date on which the Class Invested Amount
     of each of the Class A-1, A-2 and A-3 Investor Certificates is reduced to
     zero. In the absence of a 1990 Trust Amortization Event, the 1990 Trust
     Termination Date will occur following the repayment of the Class Invested
     Amount for the Class A-3 Investor Certificates issued by the 1990 Trust,
     which repayment will commence on the first Distribution Date following the
     Due Period commencing December 1, 1998, which is the Scheduled Class
     Amortization Date for the Class A-3 Investor Certificates.
 
ALLOCATION OF COLLECTIONS PRIOR TO THE 1990 TRUST TERMINATION DATE
 
     Collections. On each Distribution Date related to a Due Period commencing
prior to the 1990 Trust Termination Date, the Servicer will deposit, or direct
the 1990 Trust Trustee to deposit, all Related 1990 Certificate Collections due
to the Master Trust as holder of the Related 1990 Certificate into the
Collections Account but only to the extent of the aggregate amount of
Collections required to be deposited into each
 
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<PAGE>   77
 
Series Account or, without duplication, distributed on such Distribution Date to
Certificateholders, to any Swap Counterparty or to any other Enhancement
Provider pursuant to the terms of any Supplement or any agreement governing the
terms of any Enhancement (an "Enhancement Agreement"). If at any time prior to
such Distribution Date the amount of Collections deposited in the Collections
Account exceeds the amount required to be deposited, the Servicer will be
permitted to withdraw the excess from the Collections Account.
 
          "Collections" shall mean (a) prior to the 1990 Trust Termination Date,
     amounts distributed by the 1990 Trust to the Master Trust as holder of any
     1990 Trust Investor Certificate issued to and held by the Master Trust and
     (b) after the 1990 Trust Termination Date, NITC Finance Charges, Dealer
     Finance Charge Collections and Principal Collections.
 
     Allocations. On each Distribution Date related to a Due Period commencing
prior to the 1990 Trust Termination Date, all Related 1990 Certificate
Collections and Investment Income will be allocated to the Offered Series.
 
          "Investment Income" means, for any Distribution Period, the sum of (a)
     income from the investment of funds on deposit in the Series Principal
     Account, the Spread Account, the Distribution Account and the Negative
     Carry Reserve Fund and (b) the Series Allocation Percentage of income from
     the investment of funds on deposit in the Collections Account and the
     Excess Funding Account.
 
     On each Transfer Date related to a Due Period commencing prior to the 1990
Trust Termination Date, Related 1990 Certificate Interest Collections for such
Due Period and Investment Income and any Net Swap Receipts for the related
Distribution Period will be applied in the following amounts and in the
following order of priority:
 
          (a) On a pro rata basis between clauses (i) and (ii), (i) an amount
     equal to (A) Monthly Interest for such Distribution Period, plus (B)
     Monthly Interest for any prior Distribution Period to the extent that such
     amount has not previously been distributed to the Offered
     Certificateholders on a prior Distribution Date, plus (C) to the extent
     permitted by law, additional interest at the Offered Certificate Rate for
     such Distribution Period that has accrued on the aggregate of any Monthly
     Interest previously due but not distributed and (ii) an amount equal to the
     Net Swap Payment, if any, for such Distribution Period (plus any Net Swap
     Payments for any prior Distribution Period, and interest thereon, to the
     extent that such amount has not been previously distributed to the Swap
     Counterparty on a prior Distribution Date), will be deposited into the
     Distribution Account.
 
          (b) During any Early Amortization Period or any Investment Period, an
     amount equal to the Negative Carry Reserve Fund Deposit Amount shall be
     deposited in the Negative Carry Reserve Fund.
 
     Any Related 1990 Certificate Interest Collections, Investment Income or Net
Swap Receipts remaining after the applications described in paragraphs (a) and
(b) above shall be allocated and paid to the Seller.
 
     If, during any Investment Period or Early Amortization Period prior to the
1990 Trust Termination Date, Related 1990 Certificate Interest Collections for
such Due Period and Investment Income and Net Swap Receipts for the related
Distribution Period are insufficient to make the applications described in
clause (a) above, the Master Trust Trustee shall withdraw funds from the
Negative Carry Reserve Fund and apply such funds in the same manner as Related
1990 Certificate Interest Collections pursuant to clause (a) above. The Negative
Carry Subordinated Amount shall be reduced by the product of (i) the amount so
applied and (ii) 1.00 plus the Subordinated Percentage.
 
     On each Transfer Date related to a Due Period commencing prior to the 1990
Trust Termination Date and occurring during a Class Amortization Period with
respect to the Related 1990 Certificate (which will result in the occurrence of
either an Early Amortization Event or an Investment Event as described herein),
Related 1990 Certificate Principal Collections for such Due Period will be
allocated pro rata between the Series Principal Account to the extent of the
Invested Amount and the Negative Carry Reserve Fund to the extent of the
Negative Carry Reserve Fund Deposit Amount. Any remaining Related 1990
Certificate Principal Collections shall be paid to the Seller.
 
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<PAGE>   78
 
ALLOCATION OF COLLECTIONS AFTER THE 1990 TRUST TERMINATION DATE
 
     Collections. After the 1990 Trust Termination Date, the Servicer will
deposit all Principal Collections into the Collections Account within two
business days of receipt thereof. With respect to each Due Period commencing
after the 1990 Trust Termination Date, on a business day no earlier than the
second business day following the end of that Due Period but no later than the
fifth business day following the end of that Due Period (each a "NITC Interest
Transfer Date"), the Servicer will direct the Master Trust Trustee to withdraw
from the Interest Deposit Account and deposit in the Collections Account an
amount equal to the NITC Finance Charges for the immediately preceding Due
Period (see "Relationship with NITC -- Interest Deposit Agreements and Interest
Deposit Accounts"). In addition, the Servicer will deposit all Dealer Finance
Charge Collections in the Collections Account within two business days of
receipt thereof, net of any Dealer Finance Charge Collections that represent
Advance Reimbursements. Finally, the Servicer will deposit any Advance for the
Due Period in the Collections Account on or before the Transfer Date (see "--
Advances").
 
     Notwithstanding the foregoing, if NFC achieves and maintains an acceptable
short term rating from the Rating Agencies then rating each outstanding Series
or if the Rating Agency Condition with respect to each outstanding Series has
been satisfied, the Servicer may make a single deposit in the Collections
Account in same-day or next-day funds not later than 12:00 noon, New York City
time, on the Transfer Date in a net amount equal to the amount which would have
been on deposit with respect to the immediately preceding Due Period in the
Collections Account. In addition, the Servicer will only be required to deposit
Collections into the Collections Account up to the aggregate amount of
Collections required to be deposited into each Series Account or, without
duplication, distributed on the related Distribution Date to Certificateholders
or to any Swap Counterparty or any person providing any other Enhancement (other
than the Certificateholders or the holders of any Master Trust Seller's
Certificates) (an "Enhancement Provider") pursuant to the terms of any
Supplement or Enhancement Agreement, and if at any time prior to such
Distribution Date the amount of Collections deposited in the Collections Account
exceeds the amount required to be deposited the Servicer will be permitted to
withdraw the excess from the Collections Account.
 
     Allocations Among Series -- Principal Collections. On each business day
prior to the Fully Funded Date, the Servicer will allocate to each outstanding
Series, including the Offered Series, its share of Principal Collections.
Allocations to the Offered Series will be made in amounts equal to the product
of the Series Allocation Percentage for the Due Period in which such business
day occurs and the amount of Principal Collections for such business day
(referred to herein as "Series Allocable Principal Collections").
 
          "Principal Collections" means, with respect to any business day the
     sum of (a) Dealer Note Collections for such business day, (b) amounts
     deposited by the Seller on such business day in respect of Ineligible
     Dealer Notes as described in "-- Certain Representations and Warranties;
     Ineligible Dealer Notes; Purchase of Certificateholders' Interest" and (c)
     prior to the 1990 Trust Termination Date, the aggregate principal amount of
     proceeds of maturing 1990 Trust Investment Securities and, after the 1990
     Trust Termination Date, the aggregate principal amount of Eligible
     Investments in the Excess Funding Account maturing on such business day.
 
          "Dealer Note Collections" means, with respect to each business day,
     (a) all payments including Insurance Proceeds, if any, received by the
     Servicer from persons other than NFC in respect of repayment of principal
     of the Dealer Notes at one of its administrative units charged with
     processing funds and recording them in the Servicer's records, in the form
     of cash, checks, wire transfers or other forms of payment in accordance
     with the Dealer Agreement in effect from time to time, (b) all cash
     payments made by NFC or NITC in respect of non-cash proceeds received from
     Dealers or credits granted to Dealers by NITC with respect to the repayment
     of principal of the Dealer Notes and (c) recoveries made by the Servicer
     allocable to the Dealer Notes, in each case as deposited in the Collections
     Account on such business day.
 
          The "Series Allocation Percentage" for the Offered Series for any Due
     Period commencing after the 1990 Trust Termination Date is equal to the
     percentage equivalent of a fraction, the numerator of which is the Adjusted
     Invested Amount and the denominator of which is the Master Trust Adjusted
     Invested
 
                                       62
<PAGE>   79
 
     Amount, in each case as of the end of the Distribution Date preceding such
     Due Period (after giving effect to all payments made on such Distribution
     Date).
 
          "Invested Amount" means, with respect to any Distribution Date, the
     Initial Invested Amount minus the sum of (a) the aggregate amount of
     payments of principal in respect of the Offered Certificates paid to the
     Offered Certificateholders on or prior to such Distribution Date, (b) the
     aggregate amount of Certificateholder Charge-Offs not reimbursed on or
     prior to such Distribution Date, (c) the aggregate amount of Series
     Principal Account Losses on or prior to such Distribution Date and (d) the
     aggregate Early Distribution Amounts made on or prior to such Distribution
     Date.
 
          "Adjusted Invested Amount" means, with respect to any Distribution
     Date, the Initial Invested Amount, plus the Available Subordinated Amount
     as of the end of the related Transfer Date, plus the Negative Carry
     Subordinated Amount as of the end of such Transfer Date, minus the product
     of (i) the amount, if any, of funds on deposit in the Negative Carry
     Reserve Fund at the end of such Transfer Date and (ii) 1.00 plus the
     Subordinated Percentage, minus the aggregate amount of Certificateholder
     Charge-Offs not reimbursed on or prior to such Distribution Date, minus the
     aggregate Early Distribution Amounts made on or prior to such Distribution
     Date.
 
          "Series Principal Account Losses" means losses of principal on
     investment of funds in the Series Principal Account.
 
          The "Master Trust Invested Amount" is equal to the sum of the invested
     amounts for all outstanding Series.
 
          The "Master Trust Adjusted Investment Amount" is equal to the sum of
     the adjusted invested amounts for all outstanding Series.
 
     Allocations Among Series -- Finance Charge Collections and Dealer Note
Losses. Pursuant to the Pooling and Servicing Agreement, on each Transfer Date
related to a Due Period commencing after the 1990 Trust Termination Date and
occurring prior to the Fully Funded Date, the Servicer will allocate to each
outstanding Series, including the Offered Series, its share of Finance Charge
Collections and Dealer Note Losses for such Due Period. Allocations to the
Offered Series will be made in amounts equal to the product of the Series
Allocation Percentage and the amount of Finance Charge Collections and Dealer
Note Losses for such Due Period (referred to herein as "Series Allocable Finance
Charge Collections" and "Series Allocable Dealer Note Losses," respectively).
 
          "Dealer Note Losses" means, with respect to any Due Period commencing
     after the 1990 Trust Termination Date, the aggregate face amount of Dealer
     Notes written off as uncollectible by the Servicer during such Due Period
     minus any recoveries made during such Due Period on Dealer Notes previously
     written off as uncollectible.
 
          "Finance Charge Collections" shall mean, with respect to any Due
     Period, the positive amount, if any, by which the sum of Dealer Finance
     Charge Collections and NITC Finance Charges exceeds Advance Reimbursements
     during such Due Period.
 
     Allocation Between the Offered Certificateholders and the Seller --
Principal Collections. After allocating amounts among the Series, on each
business day after the 1990 Trust Termination Date the Servicer will allocate to
the Offered Certificateholders the Floating Allocation Percentage of Series
Allocable Principal Collections for such business day during the Revolving
Period or the Principal Allocation Percentage of Series Allocable Principal
Collections for such business day during the Accumulation Period, any Early
Amortization Period or any Investment Period (such amount on each such business
day, together with any Available Certificateholder Interest Collections and Net
Swap Receipts treated as Offered Series Principal Collections on such business
day as described in paragraph (d) of "-- Available Certificateholder Interest
Collections" below, being "Offered Series Principal Collections").
 
     Amounts allocated to the Offered Series but not allocated to the Offered
Certificateholders as described above will be allocated to the Seller, as the
holder of the Master Trust Seller's Certificates. As described
 
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<PAGE>   80
 
below, a portion of the amount allocated to the Seller is subordinated to the
Offered Certificateholders' Interest and is generally drawn from Available
Seller's Principal Collections.
 
          The "Floating Allocation Percentage" for the Offered Series for any
     Due Period commencing after the 1990 Trust Termination Date is equal to the
     percentage equivalent (which shall not exceed 100%) of a fraction, the
     numerator of which is the Invested Amount as of the immediately preceding
     Distribution Date and the denominator of which is the product of (a) the
     sum of the aggregate principal amount of Dealer Notes in the Master Trust
     and the aggregate principal amount of funds in the Excess Funding Account
     as of the end of the preceding Due Period and (b) the Series Allocation
     Percentage for the Due Period for which the Floating Allocation Percentage
     is being calculated.
 
          The "Principal Allocation Percentage" for the Offered Series for any
     Due Period commencing after the 1990 Trust Termination Date and occurring
     during the Accumulation Period, any Investment Period, or any Early
     Amortization Period is equal to the percentage equivalent of a fraction,
     the numerator of which is the Invested Amount at the end of the last day of
     the Revolving Period and the denominator of which is equal to the product
     of (a) the sum of the aggregate amount of Dealer Notes in the Master Trust
     and the aggregate principal amount of funds in the Excess Funding Account
     as of the end of the last day of the Revolving Period and (b) the Series
     Allocation Percentage for the Due Period for which the Principal Allocation
     Percentage is being calculated.
 
     Allocation Between the Offered Certificateholders and the Seller -- Finance
Charge Collections and Dealer Note Losses. On each Transfer Date related to a
Due Period commencing after the 1990 Trust Termination Date, the Servicer will
allocate to the Offered Certificateholders, from the amount allocated to the
Offered Series for such Transfer Date, the following amounts:
 
          (a) the Floating Allocation Percentage of Series Allocable Finance
     Charge Collections for such Due Period (the "Offered Series Finance Charge
     Collections"); and
 
          (b) the Floating Allocation Percentage of Series Allocable Dealer Note
     Losses for such Due Period ("Offered Series Dealer Note Losses").
 
     Amounts allocated to the Offered Series but not allocated to the Offered
Certificateholders as described above will be allocated to the Seller, as the
holder of the Master Trust Seller's Certificates. As described below, a portion
of the amount allocated to the Seller is subordinated to the Offered
Certificateholders' Interest and is generally drawn from Available Seller's
Finance Charge Collections.
 
          "Available Seller's Finance Charge Collections" for any Due Period
     commencing after the 1990 Trust Termination Date means an amount equal to
     the product of (a) the excess of (i) the Seller's Percentage for such Due
     Period over (ii) the result of the Excess Seller's Percentage for such Due
     Period minus the Required Excess Seller Interest Percentage and (b) Series
     Allocable Finance Charge Collections for such Due Period, except that
     Available Seller's Finance Charge Collections shall be zero for any Due
     Period to the extent the Available Subordinated Amount and the Negative
     Carry Subordinated Amount (minus the product of (i) the amount of funds on
     deposit in the Negative Carry Reserve Fund and (ii) 1.00 plus the
     Subordinated Percentage) equals or is reduced to zero on the Transfer Date
     related to such Due Period.
 
          "Available Seller's Principal Collections" for any business day after
     the 1990 Trust Termination Date means an amount equal to the product of (a)
     the excess of (i) the Seller's Percentage for the Due Period in which such
     business day occurs over (ii) the Excess Seller's Percentage for such Due
     Period and (b) Series Allocable Principal Collections for such Due Period,
     except that Available Seller's Principal Collections shall be zero for any
     business day to the extent the Available Subordinated Amount and the
     Negative Carry Subordinated Amount (minus the product of (i) the amount of
     funds on deposit in the Negative Carry Reserve Fund and (ii) 1.00 plus the
     Subordinated Percentage) equals or is reduced to zero on the Transfer Date
     immediately preceding such business day.
 
          "Excess Seller's Percentage" for any Due Period commencing after the
     1990 Trust Termination Date means a percentage (not less than 0% nor more
     than 100%) equal to the Seller's Percentage minus
 
                                       64
<PAGE>   81
 
     the percentage equivalent (not less than 0% nor more than 100%) of a
     fraction, the numerator of which is the sum of the (a) Available
     Subordinated Amount as of the end of the related Transfer Date and (b) the
     Negative Carry Subordinated Amount (minus the product of (i) the amount of
     funds on deposit in the Negative Carry Reserve Fund and (ii) 1.00 plus the
     Subordinated Percentage), and the denominator of which is the product of
     (x) the sum of the aggregate principal amount of Dealer Notes and aggregate
     principal amount of funds on deposit in the Excess Funding Account as of
     the end of the immediately preceding Due Period and (y) the Series
     Allocation Percentage for the Due Period for which the Excess Seller's
     Percentage is being calculated.
 
          "Excess Seller's Principal Collections" for any business day during a
     Due Period commencing after the 1990 Trust Termination Date means the
     product of (a) Series Allocable Principal Collections for such business day
     and (b) the Excess Seller's Percentage for such Due Period.
 
          "Seller's Percentage" for any Due Period commencing after the 1990
     Trust Termination Date means 100% minus (a) the Floating Allocation
     Percentage for such Due Period, when used with respect to Finance Charge
     Collections and Dealer Note Losses at all times and Principal Collections
     during the Revolving Period, or (b) the Principal Allocation Percentage for
     such Due Period, when used with respect to Principal Collections during the
     Accumulation Period, any Investment Period or Early Amortization Period.
 
          "Seller's Principal Collections" for any business day after the 1990
     Trust Termination Date means an amount equal to the sum of (a) Available
     Seller's Principal Collections for such business day and (b) Excess
     Seller's Principal Collections for such business day.
 
          "Required Excess Seller Interest Percentage" shall be set forth in the
     Prospectus Supplement for the Offered Series.
 
     Available Certificateholder Interest Collections. On each Transfer Date
related to a Due Period commencing after the 1990 Trust Termination Date but
ending prior to the Fully Funded Date, Offered Series Finance Charge Collections
for such Due Period together with other amounts comprising Investment Income for
the related Distribution Period (collectively, "Available Certificateholder
Interest Collections"), and Net Swap Receipts for the related Distribution
Period, if any, will be applied in the following amounts and in the following
order of priority:
 
          (a) An amount equal to the Offered Series Servicing Fee for such Due
     Period (unless such amount has been netted against deposits to the
     Collections Account or waived) will be retained (or deposited) in the
     Collections Account and allocated to the Servicer.
 
          (b) On a pro rata basis between clauses (i) and (ii), (i) an amount
     equal to (A) Monthly Interest for such Distribution Period, plus (B)
     Monthly Interest for any prior Distribution Period to the extent that such
     amount has not previously been distributed to the Offered
     Certificateholders on a prior Distribution Date, plus (C) to the extent
     permitted by law, additional interest at the Offered Certificate Rate for
     such Distribution Period that has accrued on the aggregate of any Monthly
     Interest previously due but not distributed and (ii) an amount equal to the
     Net Swap Payment, if any, for such Distribution Period (plus any Net Swap
     Payments for any prior Distribution Period, and interest thereon, to the
     extent that such amount has not been previously distributed to the Swap
     Counterparty on a prior Distribution Date), will be deposited into the
     Distribution Account.
 
          (c) An amount equal to any Offered Series Dealer Note Losses, if any,
     for such Due Period will be reimbursed by being treated as Offered Series
     Principal Collections for such Transfer Date.
 
          (d) An amount equal to the aggregate amount of unreimbursed
     Certificateholder Charge-Offs, if any, for such Due Period will be
     reimbursed by being treated as Offered Series Principal Collections for
     such Transfer Date and will reimburse such Certificateholder Charge-Offs.
 
          (e) An amount equal to any Spread Account Deposit Amount, if any, for
     such Due Period will be deposited into the Spread Account.
 
                                       65
<PAGE>   82
 
          (f) An amount equal to the aggregate outstanding amounts of the
     Offered Series Servicing Fee which have been previously waived (unless such
     amount has been waived again) shall be allocated and paid to the Servicer.
 
          (g) An amount equal to the excess, if any, of the Maximum Subordinated
     Amount as of the end of the preceding Transfer Date over the Available
     Subordinated Amount as of the end of the preceding Transfer Date shall be
     (i) during the Revolving Period or the Accumulation Period, allocated and
     paid to the Seller or (ii) during an Investment Period or an Early
     Amortization Period, deposited in the Liquidity Reserve Account, and in
     either case (i) or (ii) the Available Subordinated Amount shall be
     reinstated by the amount of such payment or deposit.
 
     Any Available Certificateholder Interest Collections and Net Swap Receipts
not used as described above (or to pay amounts owing to a present or former Swap
Counterparty in connection with certain swap termination events) will constitute
"Excess Interest Collections" and will be available for allocation to other
Series to the extent of shortfalls and otherwise will be allocated to the
Seller. By contrast, if Available Certificateholder Interest Collections and Net
Swap Receipts are not sufficient to satisfy each of the applications described
above on any Transfer Date, then excess interest collections from other Series
allocable to the Offered Series will be applied as Available Certificateholder
Interest Collections in the priority and the manner described in clauses (a)
through (g) above. If Excess Interest Collections for all Series are less than
the shortfalls for all Series that provide for allocations of excess interest
collections from other Series, such excess interest collections from other
Series will be allocable to shortfalls for the Offered Series and any other
Series that so provides pro rata based on the relative amounts of each Series'
shortfall.
 
     If Available Certificateholder Interest Collections, Net Swap Receipts and
excess interest collections from other Series allocated to the Offered Series
are insufficient to make all of the applications described in clauses (a), (b),
(c) and (d) above, there will be a "Deficiency Amount," which will equal the
aggregate amount of such insufficiency. Funds from, but only to the extent of,
the following sources and in the following order of priority will be applied, in
the same fashion as Available Certificateholder Interest Collections and
pursuant to the clauses and in the priorities set forth above, to reduce a
Deficiency Amount:
 
          (x) under the circumstances specified in clause (b) of the definition
     of Early Amortization Event, the amount of Available Seller's Finance
     Charge Collections or other funds which the Seller elects to use
     thereunder;
 
          (y) on any Transfer Date during an Early Amortization Period caused by
     a payment default by the Swap Counterparty, Available Seller's Finance
     Charge Collections in an amount equal to the least of (i) the Deficiency
     Amount, (ii) the portion of the Net Swap Receipt that was not received for
     the related Distribution Period and (iii) the Negative Carry Subordinated
     Amount;
 
          (z) Available Draw Funds, in an amount not to exceed the Draw Amount.
 
     The Negative Carry Subordinated Amount will be reduced by the product of
(i) the amount of any application of Available Seller's Finance Charge
Collections pursuant to clause (y) above and (ii) 1.00 plus the Subordinated
Percentage. The Available Subordinated Amount will be reduced by the amount of
any Available Draw Funds applied pursuant to clause (z) above.
 
          "Available Draw Funds" for any Transfer Date means funds which shall
     be drawn from the following sources in the following order of priority:
 
             (i) Available Seller's Finance Charge Collections remaining after
        the applications specified in clauses (x) and (y) above;
 
             (ii) the Spread Account; and
 
             (iii) for any Transfer Date occurring during any Investment Period
        or Early Amortization Period, the Liquidity Reserve Account.
 
                                       66
<PAGE>   83
 
          "Draw Amount" means the least of (a) the Deficiency Amount, (b) the
     Available Subordinated Amount as of the end of the preceding Transfer Date
     and (c) Available Draw Funds for such Transfer Date.
 
     If all of the amounts applied above are insufficient to make the entire
application described in clause (c) above, the Available Subordinated Amount
shall be reduced (but not below zero) by the amount of such insufficiency and
the Offered Series Dealer Note Losses will be deemed reimbursed by the amount of
such reduction.
 
     If during the Accumulation Period, any Investment Period or any Early
Amortization Period, Available Certificateholder Interest Collections, Net Swap
Receipts, excess interest collections from other Series and Available Draw Funds
applied above are insufficient to make all the applications described in clause
(b) above, the Master Trust Trustee shall withdraw funds from the Negative Carry
Reserve Fund and apply such funds in the same manner as Available
Certificateholder Interest Collections pursuant to clause (b) above. The
Deficiency Amount will be reduced by the amount so applied and the Negative
Carry Subordinated Amount will be reduced by the product of (i) the amount so
applied and (ii) 1.00 plus the Subordinated Percentage.
 
     On each Transfer Date related to a Due Period occurring during an
Investment Period or during the Accumulation Period, any remaining Available
Seller's Finance Charge Collections not used as Available Draw Funds will be
deposited in the Negative Carry Reserve Fund to the extent of the Negative Carry
Reserve Fund Deposit Amount. On each Transfer Date related to a Due Period
occurring during an Investment Period or an Early Amortization Period, any
remaining Available Seller's Finance Charge Collections not used as Available
Draw Funds or deposited in the Negative Carry Reserve Fund (to the extent
required as described in the preceding sentence) will be deposited in the
Liquidity Reserve Account to the extent that the Available Subordinated Amount
as of the end of the preceding Transfer Date exceeds the aggregate amount of
funds on deposit in the Liquidity Reserve Account and the Spread Account, and
then, to the extent of any remaining Negative Carry Reserve Fund Deposit Amount,
shall be deposited in the Negative Carry Reserve Fund. Available Seller's
Finance Charge Collections remaining after the applications described in the
preceding sentence shall, to the extent of any remaining shortfall in the
application described in clause (e) above (or, if less, the amount of remaining
Available Seller's Finance Charge Collections), be applied in accordance with
such clause.
 
     On each Transfer Date related to a Due Period commencing after the Due
Period related to the Fully Funded Date, Available Certificateholder Interest
Collections for such Due Period and Net Swap Receipts for the related
Distribution Period, if any, will be applied on a pari passu basis in an amount
equal to (A) Monthly Interest for the Distribution Period (including any
previously due but unpaid Monthly Interest, and interest thereon) and (B) the
Net Swap Payment, if any, for the related Distribution Period (including any
previously due but unpaid Net Swap Payments, and interest thereon). If such
amounts are insufficient to pay Monthly Interest and Net Swap Payments, then
funds up to such insufficiency will be withdrawn from the Negative Carry Reserve
Fund and applied for such purposes. The Negative Carry Subordinated Amount shall
be reduced by the product of (i) the amount so applied and (ii) 1.00 plus the
Subordinated Percentage.
 
     Principal Collections. On each business day, Offered Series Principal
Collections will be applied in the following priority:
 
          (a) Offered Series Principal Collections will first be deposited in
     the Series Principal Account to the extent required to make principal
     distributions to the Offered Certificateholders. No amount is required to
     be set aside for such purpose during the Revolving Period. On each business
     day during any Investment Period or any Early Amortization Period, Offered
     Series Principal Collections will be allocated to the Offered
     Certificateholders and deposited in the Series Principal Account to the
     extent the Invested Amount as of the preceding Distribution Date exceeds
     the amount of funds on deposit in the Series Principal Account on such
     business day. On each business day during the Accumulation Period (but not
     during any Early Amortization Period or Investment Period), Offered Series
     Principal Collections will be allocated to the Offered Certificateholders
     and deposited in the Series Principal Account in an amount which, when
     added to the amount of Offered Series Principal Collections
 
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<PAGE>   84
 
     previously deposited in the Series Principal Account during the Due Period
     in which such business day occurs, shall not exceed the Controlled Deposit
     Amount for such Due Period.
 
          (b) Shared Principal Collections, if any, will be determined and
     allocated to other Series that so provide to the extent of any principal
     shortfalls with respect thereto and otherwise will be deposited in the
     Excess Funding Account to the extent necessary to maintain the Master Trust
     Seller's Interest at an amount equal to (or, in the discretion of the
     Seller, greater than) the Minimum Master Trust Seller's Interest or
     allocated to the Seller. Shared principal collections for all other Series
     will be determined on each business day and allocated to the Offered Series
     to the extent of any Principal Shortfall. If shared principal collections
     for all Series are less than the principal shortfalls for all Series that
     provide for allocations of shared principal collections from other Series,
     such shared principal collections from other Series will be allocable to
     shortfalls for the Offered Series and any other Series that so provides pro
     rata based on the relative amounts of each such Series' principal
     shortfall.
 
          "Controlled Deposit Amount" for any Due Period occurring during the
     Accumulation Period means the excess, if any, of (a) the product of the
     Controlled Amortization Amount and the number of Due Periods that have
     occurred with respect to the Accumulation Period through and including such
     Due Period (but not in excess of the Accumulation Period Length) over (b)
     the amount on deposit in the Series Principal Account at the end of the
     preceding Due Period, except that, notwithstanding the foregoing, the
     Seller may, in its sole discretion, increase the Controlled Deposit Amount
     at any time and from time to time.
 
          "Controlled Amortization Amount" means an amount equal to the Invested
     Amount as of the Distribution Date preceding the Accumulation Period
     Commencement Date divided by the Accumulation Period Length.
 
     The portion of Offered Series Principal Collections in excess of the amount
required to be allocated to the Series Principal Account to be available for
required principal distributions on the Offered Certificates as described herein
is referred to as "Shared Principal Collections." Thus, Shared Principal
Collections for any business day during the Revolving Period will equal Offered
Series Principal Collections (because no amounts are then required to be set
aside for distributions of principal on the Offered Certificates), and for any
Due Period during the Accumulation Period, any Early Amortization Period or any
Investment Period, will equal the excess, if any, of Offered Series Principal
Collections over the amount deposited in the Series Principal Account pursuant
to paragraph (a) above.
 
     The extent to which Offered Series Principal Collections for a business day
are insufficient to make the required allocations to the Series Principal
Account is referred to as the "Principal Shortfall." Thus, the Principal
Shortfall for any business day during the Accumulation Period (an "Accumulation
Period Principal Shortfall") will equal the excess, if any, of the Controlled
Deposit Amount over the amount of Offered Series Principal Collections deposited
in the Series Principal Account on such business day when added to the amount of
Offered Series Principal Collections previously deposited in the Series
Principal Account during such Due Period, or during any Early Amortization
Period or Investment Period will equal the excess, if any, of the Invested
Amount (reduced by amounts on deposit in the Series Principal Account and the
aggregate amount of Series Principal Account Losses for the Distribution Period
in which such business day occurs) over Offered Series Principal Collections.
 
     On each business day (A) during the Accumulation Period, Available Seller's
Principal Collections will be deposited in the Negative Carry Reserve Fund in an
amount equal to the Negative Carry Reserve Fund Deposit Amount, and (B) during
an Early Amortization Period or Investment Period (prior to the Fully Funded
Date), Available Seller's Principal Collections will be, on a pro rata basis
between clauses (i) and (ii) based on the respective amounts owed, (i) deposited
in the Liquidity Reserve Account to the extent the Available Subordinated Amount
as of the end of the immediately preceding Transfer Date exceeds the amount of
funds on deposit in the Liquidity Reserve Account and (ii) deposited in the
Negative Carry Reserve Fund in an amount equal to the Negative Carry Reserve
Fund Deposit Amount. The amounts required to be deposited pursuant to the
preceding sentence shall be reduced by the amount of Available Seller's Finance
Charge Collections deposited in the Negative Carry Reserve Fund or the Liquidity
Reserve
 
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<PAGE>   85
 
Account, as applicable, on such business day. Any remaining Available Seller's
Principal Collections shall be deemed "Remaining Available Seller's Principal
Collections" and included in Shared Seller Principal Collections as provided
below.
 
     On each business day during the Revolving Period or the Accumulation
Period, Shared Seller Principal Collections, if any, and shared seller principal
collections for any other Series that provides for shared seller principal
collections shall be determined on each business day and allocated in the
following priority: (i) to the Offered Series to the extent of any Accumulation
Period Principal Shortfall and to any other Series to the extent such Series
provides for the use of shared seller principal collections in respect of
principal shortfalls, (ii) to the Excess Funding Account to the extent necessary
to maintain the Master Trust Seller's Interest at an amount equal to (or, in the
discretion of the Seller, greater than) the Minimum Master Trust Seller's
Interest and (iii) to the Seller. If shared seller principal collections for all
Series, including Shared Seller Principal Collections, are less than the
shortfalls for which shared seller principal collections may be used, including
any Accumulation Period Principal Shortfall, then such shared seller principal
collections will be allocated to all such shortfalls, including any Accumulation
Period Principal Shortfall, pro rata based on the relative amounts of each such
shortfall.
 
          "Shared Seller Principal Collections" means on each business day (i)
     during a Revolving Period, all Available Seller's Principal Collections and
     all Excess Seller's Principal Collections and (ii) during an Accumulation
     Period, all Remaining Available Seller's Principal Collections and all
     Excess Seller's Principal Collections. There shall be no Shared Seller
     Principal Collections during any Investment Period or Early Amortization
     Period.
 
     On each business day during any Investment Period or any Early Amortization
Period, all Excess Seller's Principal Collections, all Remaining Available
Seller's Principal Collections and all shared principal collections not
allocated in respect of principal shortfalls shall be allocated and paid to the
Seller or deposited in the Excess Funding Account to the extent necessary to
maintain the Master Trust Seller's Interest at an amount equal to (or, in the
Seller's discretion, greater than) the Minimum Master Trust Seller's Interest.
 
     If on any Distribution Date during an Investment Period after the
application of all funds to be allocated or distributed on such date the excess,
if any, of (a) the Invested Amount over (b) the amount in the Series Principal
Account (the "Investment Period Shortfall Amount") is less than or equal to the
aggregate amount of funds contained in the Liquidity Reserve Account, then funds
shall be withdrawn from the Liquidity Reserve Account in an amount equal to the
Investment Period Shortfall Amount and shall be deposited in the Series
Principal Account. If on any Distribution Date during an Early Amortization
Period after the application of all funds to be allocated or distributed on such
date the excess, if any, of (x) the Invested Amount over (y) the amount in the
Series Principal Account (the "Early Amortization Period Shortfall Amount") is
less than or equal to the aggregate amount of funds contained in the Negative
Carry Reserve Fund and the Liquidity Reserve Account, then funds shall be
withdrawn first from the Negative Carry Reserve Fund and then from the Liquidity
Reserve Account in an amount equal to the Early Amortization Period Shortfall
Amount and shall be deposited in the Series Principal Account.
 
     Limited Subordination of Master Trust Seller's Interest; Spread Account;
Liquidity Reserve Account. After the 1990 Trust Termination Date, a portion of
the Master Trust Seller's Interest will be subordinated to the Offered
Certificateholders' Interest to the extent of the Available Subordinated Amount
and, under certain circumstances, the Negative Carry Subordinated Amount.
 
          The "Available Subordinated Amount" for the Offered Series will be
     zero for each Transfer Date relating to a Due Period commencing prior to
     the 1990 Trust Termination Date and on the Transfer Date related to the
     first Due Period after the 1990 Trust Termination Date will equal the
     product of the Subordinated Percentage and the Invested Amount, and for
     each Transfer Date thereafter will equal the lesser of: (a) the Maximum
     Subordinated Amount for the Offered Series and (b) the Available
     Subordinated Amount for the Offered Series as of the end of the preceding
     Transfer Date (after giving effect to all adjustments thereto on such
     Transfer Date).
 
                                       69
<PAGE>   86
 
          The "Maximum Subordinated Amount" for the Offered Series means the
     product of (a) the Invested Amount and (b) the Subordinated Percentage,
     except that upon the occurrence of an Investment Event or an Early
     Amortization Event, the Maximum Subordinated Amount shall not decline until
     the Invested Amount equals the Maximum Subordinated Amount, and thereafter
     the Maximum Subordinated Amount will equal the Invested Amount.
 
     The "Subordinated Percentage" with respect to the Offered Certificates will
be set forth in the Prospectus Supplement.
 
     If the Available Subordinated Amount falls below the Required Subordinated
Amount for any Transfer Date, an Investment Event or Early Amortization Event
will occur. The "Required Subordinated Amount" will be set forth in the
Prospectus Supplement.
 
          "Negative Carry Subordinated Amount" shall mean, (a) on any Transfer
     Date related to a Due Period occurring prior to the commencement of the
     Accumulation Period, any Early Amortization Period or any Investment
     Period, an amount equal to the product of (i) the Negative Carry Reserve
     Fund Required Amount and (ii) 1.00 plus the Subordinated Percentage and (b)
     at the beginning of each Transfer Date thereafter, an amount equal to the
     Negative Carry Subordinated Amount as of the end of the immediately
     preceding Transfer Date (after giving effect to all reductions in the
     Negative Carry Subordinated Amount on such preceding Transfer Date).
 
     The Spread Account will be an Eligible Deposit Account established and
maintained prior to the 1990 Trust Termination Date in the name of the Master
Trust Trustee for the benefit of the Offered Certificateholders. As described
above, the Spread Account is available to supplement Available Certificateholder
Interest Collections, Net Swap Receipts, excess interest collections from other
Series allocable to the Offered Series and Available Seller's Finance Charge
Collections. Monies in the Spread Account will be invested in Eligible
Investments. After the earliest of (a) the payment in full of the Invested
Amount, (b) the Fully Funded Date and (c) the Series Termination Date, any funds
remaining on deposit in the Spread Account will be distributed to the Seller. On
any Transfer Date after the 1990 Trust Termination Date and prior to the Fully
Funded Date, if the amount in the Spread Account is less than the Projected
Spread, the Master Trust Trustee will deposit the amount of such deficiency (the
"Spread Account Deposit Amount"), to the extent available from Available
Certificateholder Interest Collections, Net Swap Receipts, excess interest
collections from Offered Series and Available Seller's Finance Charge
Collections, in the Spread Account as described above in "Available
Certificateholder Interest Collections." The Spread Account will initially be
funded with an amount up to the Projected Spread from funds on deposit in the
1990 Trust Spread Account and allocated to the Offered Series. See "Navistar
Financial Securities Corporation and the Master Trust -- The Master Trust." The
"Projected Spread" will be set forth in the Prospectus Supplement. During an
Investment Period or an Early Amortization Period, the Master Trust Trustee will
deposit all Spread Account funds in the Liquidity Reserve Account.
 
     The Liquidity Reserve Account will be an Eligible Deposit Account
established and maintained on or prior to the commencement of an Early
Amortization Period or an Investment Period in the name of the Master Trust for
the benefit of the Seller. After the 1990 Trust Termination Date and after the
commencement of an Investment Period or an Early Amortization Period, Available
Seller's Principal Collections that would otherwise be paid to the Seller will
be deposited in the Liquidity Reserve Account, to the extent described herein,
until such time as the amount on deposit is equal to the Available Subordinated
Amount, in order to assure a source of funds for payment with respect thereto.
The Seller will possess all right, title and interest in all funds on deposit in
the Liquidity Reserve Account, except that no such funds will be paid to the
Seller during an Investment Period or Early Amortization Period if such payment
would reduce the funds in the Liquidity Reserve Account below an amount equal to
the Available Subordinated Amount.
 
CERTIFICATEHOLDER CHARGE-OFFS
 
     If, for any Transfer Date, the Available Subordinated Amount equals or is
reduced to zero (after giving effect to the allocations, distributions,
withdrawals and deposits to be made on such Transfer Date) and the Deficiency
Amount is greater than zero (as reduced by all the allocations, distributions,
withdrawals and
 
                                       70
<PAGE>   87
 
deposits to be made on such Transfer Date), the Invested Amount will be reduced
by such Deficiency Amount, but not by more than the Offered Series Dealer Note
Losses for the related Due Period remaining unreimbursed after all applications
of funds or reductions of the Available Subordinated Amount described herein (a
"Certificateholder Charge-Off"). As of any Transfer Date, Certificateholder
Charge-Offs for all prior Transfer Dates will be considered unreimbursed unless
such amounts are reimbursed (and to the extent not reimbursed). Unreimbursed
Certificateholder Charge-Offs will be reimbursed on any subsequent Transfer Date
out of Available Certificateholder Interest Collections, Net Swap Receipts,
excess interest collections from other Series allocable to the Offered Series
and, to the extent available therefor, Available Draw Funds and, in certain
circumstances, funds on deposit in the Negative Carry Reserve Fund. To the
extent so reimbursed, Certificateholder Charge-offs will no longer be considered
unreimbursed, and the Invested Amount will be reinstated to the extent any
Certificateholder Charge-Offs are reimbursed. See "Description of Offered
Certificates -- Allocation of Collections After the 1990 Trust Termination Date
- -- Available Certificateholder Interest Collections."
 
DISTRIBUTIONS TO OFFERED CERTIFICATEHOLDERS AND THE SWAP COUNTERPARTY
 
     On the business day immediately preceding each Distribution Date (the
"Transfer Date"), the Servicer will instruct the Master Trust Trustee to
transfer to the Distribution Account the funds on deposit in the Series
Principal Account and, to the extent provided herein, the Collections Account,
and the Servicer will instruct the Master Trust Trustee to make, without
duplication, the following distributions from the Distribution Account. All such
transfers and distributions will be made after allocations, if any, to the
Series Principal Account for such Distribution Date have been made.
 
          (a) Interest Distributions and Net Swap Payments. On each Distribution
     Date (including the Expected Payment Date), Monthly Interest will be
     distributed to the Offered Certificateholders as accrued interest on the
     Offered Certificates. To the extent any interest is due but not distributed
     on any such Distribution Date, such amount will be distributed on the
     following Distribution Date, along with, to the extent permitted by law,
     interest at the Offered Certificate Rate on such amount. In addition, Net
     Swap Payments, if any, (including any previously due but unpaid Net Swap
     Payments and interest thereon) will be made to the Swap Counterparty. If
     funds are inadequate to pay the aggregate amount of Monthly Interest and
     Net Swap Payments, such payments will be made to the extent of funds
     available pro rata based on the relative amounts due.
 
          (b) Expected Payment Date. On the Expected Payment Date, in addition
     to the amount described in (a) above, amounts on deposit in the Series
     Principal Account will be distributed as principal (up to a maximum of the
     Invested Amount on such Distribution Date) on the Offered Certificates.
 
          (c) Early Amortization Period. Except as otherwise provided in the
     Prospectus Supplement, on each Distribution Date related to a Due Period
     occurring during an Early Amortization Period, in addition to the amount
     described in (a) above, amounts on deposit in the Series Principal Account
     will be distributed as principal (up to a maximum of the Invested Amount on
     such Distribution Date) on the Offered Certificates.
 
          (d) Early Distributions. On any Early Distribution Date, the amount on
     deposit in the Series Principal Account treated as Early Distribution
     Amounts will be distributed as principal on the Offered Certificates for
     which an Early Distribution election has been made.
 
INVESTMENT EVENTS
 
     If an Investment Event occurs prior to the 1990 Trust Termination Date, the
Related 1990 Certificate will begin to amortize and Related 1990 Certificate
Principal Collections will be deposited into the Series Principal Account on
each day such Related 1990 Certificate Principal Collections are paid to the
Master Trust by, or on behalf of, the 1990 Trust (in an amount not to exceed, in
the aggregate, the Invested Amount). If an Investment Event occurs after the
1990 Trust Termination Date, commencing on the first business day following the
Investment Period Commencement Date, Series Allocable Principal Collections will
no longer be paid to the Seller or allocated to any other Series but instead
will be deposited in the Series Principal
 
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<PAGE>   88
 
Account on each business day (in an amount not to exceed, in the aggregate, the
Invested Amount), except as described below, and the Controlled Deposit Amount
will no longer apply to allocations of principal in respect of the Offered
Certificates.
 
     The "Investment Events," if any, with respect to the Offered Series will be
specified in the Prospectus Supplement.
 
     An Investment Period will commence as of the close of business on the
business day immediately preceding the day on which the Investment Event is
deemed to have occurred (the "Investment Period Commencement Date"). Deposits of
principal to the Series Principal Account on each business day will begin on the
first business day following the Investment Period Commencement Date.
 
     In connection with the issuance of the Offered Certificates, the Prospectus
Supplement may provide for Early Distributions of principal to certain Offered
Certificateholders on the Early Distribution Date. In such case, the terms
"Early Distribution," "Early Distribution Amount" and "Early Distribution Date"
will be defined in the Prospectus Supplement. If the Prospectus Supplement does
not provide for Early Distributions, such terms will not be operative.
 
EARLY AMORTIZATION EVENTS
 
     If an Early Amortization Event occurs prior to the 1990 Trust Termination
Date, the Related 1990 Certificate will begin to amortize and Related 1990
Certificate Principal Collections will be deposited into the Series Principal
Account on each day such Related 1990 Certificate Principal Collections are paid
to the Master Trust by, or on behalf of, the 1990 Trust (in an amount not to
exceed, in the aggregate, the Invested Amount). If an Early Amortization Event
occurs after the 1990 Trust Termination Date, commencing on the first business
day following the Early Amortization Period Commencement Date, Offered Series
Principal Collections will no longer be paid to the Seller, allocated to any
other Series or retained in the Excess Funding Account for the benefit of the
Offered Series but instead will be deposited into the Series Principal Account
(in an amount not to exceed, in the aggregate, the Invested Amount) to be
distributed to Offered Certificateholders monthly on each Distribution Date. The
Controlled Deposit Amount will not apply to allocations in respect of the
Offered Certificates. Unless the Prospectus Supplement with respect to an
Offered Series otherwise specifies, an "Early Amortization Event" refers to any
of the following events:
 
          (a) the Master Trust becomes an "investment company" within the
     meaning of the Investment Company Act of 1940, as amended, and is not
     exempt from compliance with such Act;
 
          (b) the failure of the Swap Counterparty to make any payment under the
     Interest Rate Swap within one day after the date such payment was due
     (after taking into account any applicable grace period under the Interest
     Rate Swap) unless (i) the Seller causes Available Seller's Finance Charge
     Collections or other funds to be applied to make such payment and (ii) the
     Servicer engages a replacement Swap Counterparty (which may be itself)
     prior to the next Transfer Date and the Rating Agency Condition is
     satisfied;
 
          (c) the Invested Amount is not reduced to zero by the Expected Payment
     Date (other than after the Fully Funded Date);
 
          (d) the United States government or any agency or instrumentality
     thereof files a notice of a lien on the assets of NFC or NFSC under
     Internal Revenue Code sec. 6323 or any similar statutory provision
     (including, but not limited to, sec. 302(f) or sec. 4068 of ERISA) which is
     or may in the future be prior to the lien of the Master Trust Trustee on
     the assets of the Master Trust (including without limitation proceeds of
     the Dealer Notes); and
 
          (e) any other event specified in the Prospectus Supplement with
     respect to an Offered Series.
 
     Upon the occurrence of any event described above, an Early Amortization
Event will be deemed to have occurred without any notice or other action on the
part of any other party immediately upon the occurrence of such event. The Early
Amortization Period will commence as of the close of business on the business
day immediately preceding the day on which the Early Amortization Event is
deemed to have occurred (the
 
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<PAGE>   89
 
"Early Amortization Period Commencement Date"). Except as otherwise provided in
the Prospectus Supplement, monthly distributions in respect of the Invested
Amount will begin on the first Distribution Date following the Due Period in
which an Early Amortization Period has commenced.
 
          "Early Amortization Period" means the period beginning on the Early
     Amortization Period Commencement Date and ending upon the first to occur of
     (a) the payment in full to the Offered Certificateholders of the Invested
     Amount and (b) the Series Termination Date.
 
TERMINATION; FULLY FUNDED DATE
 
     Termination. The Master Trust will terminate on the first to occur of (a)
the day following the Distribution Date on which the aggregate series invested
amounts for all Series is zero and no Series of variable funding certificates is
outstanding or, if later, the date on which the final distribution has been made
or provided for with respect to the Offered Certificates and each other Series
of certificates (it being understood that no distribution on any variable
funding certificate shall be final while such variable funding certificate
remains outstanding), (b) the date on which proceeds from the sale, disposal or
other liquidation of the Dealer Notes are distributed to the Certificateholders
following an insolvency event with respect to the Seller, as provided in the
Pooling and Servicing Agreement and (c) a day which is 21 years less one day
after the death of the officers and the last survivor of all the lineal
descendants of every officer of the Master Trust Trustee who are living on the
date hereof except that if at any time any of the obligations and
responsibilities of the Seller, the Servicer and the Master Trust Trustee under
the Pooling and Servicing Agreement shall be or become valid under applicable
law for a period subsequent to the 21st anniversary of the death of such last
survivor (or, without limiting the generality of the foregoing, if legislation
shall become effective providing for the validity or permitting the effective
grant of responsibilities and obligations for a period in gross, exceeding the
period for which such responsibilities and obligations are hereinabove stated to
extend and be valid), then such responsibilities and obligations shall not
terminate as aforesaid but shall extend to and continue in effect, but only if
such nontermination and extension shall then be valid under applicable law,
until one day prior to such time as the same shall, under applicable law, cease
to be valid. Upon termination of the Master Trust, all right, title and interest
in the 1990 Trust Seller Certificate and any 1990 Trust Investor Certificate
held by the Master Trust or the Dealer Notes, as the case may be, and other
funds of the Master Trust (other than amounts in the Collections Account, the
Excess Funding Account, any series principal account or distribution account for
the final distribution of principal and interest to Certificateholders, Swap
Counterparties and other Enhancement Providers) will be conveyed and transferred
to the Seller.
 
     In any event, the last payment of principal and interest on the Offered
Certificates will be due and payable no later than the "Series Termination Date"
which will be set forth in the Prospectus Supplement. In the event that the
Invested Amount is greater than zero on the Series Termination Date (after
giving effect to deposits and distributions otherwise to be made on such Series
Termination Date), the Master Trust Trustee will sell or cause to be sold (and
apply the proceeds to the extent necessary to pay such remaining amounts to all
Offered Certificateholders) an interest in the Dealer Notes in an amount equal
to 110% of the Invested Amount on such Series Termination Date (after giving
effect to such deposits and distributions) except that in no event shall such
amount exceed the Series Allocation Percentage (for the Due Period in which such
Series Termination Date occurs) of Dealer Notes and amounts on deposit in the
Excess Funding Account held by the Master Trust on such Series Termination Date.
The net proceeds of such sale and any collections on the Dealer Notes will be
paid pro rata to Offered Certificateholders on the Series Termination Date as
the final payment on the Offered Certificates. Any excess will be distributed
(i) first, to pay any amounts owing by the Master Trust to the Swap Counterparty
pursuant to the Interest Rate Swap to such Swap Counterparty and (ii) second, to
the Seller.
 
     Fully Funded Date. Following the occurrence of the Fully Funded Date,
Offered Certificateholders will no longer have any interest in the Related 1990
Certificate or the Dealer Notes, as the case may be, and all the representations
and covenants of the Seller and the Servicer relating to the Dealer Notes as
well as certain other provisions of the Pooling and Servicing Agreement and all
remedies for breach thereof, will no longer accrue to the benefit of the Offered
Certificateholders. In addition, upon the occurrence of the Fully Funded Date,
(i) neither Related 1990 Certificate Collections nor Finance Charge Collections,
Principal Collections
 
                                       73
<PAGE>   90
 
or Dealer Notes Losses, as the case may be, will be allocated to the Offered
Series and (ii) if the final distribution has been made with respect to each
other Series of investor certificates or the Fully Funded Date has occurred with
respect thereto, all right, title and interest in the Related 1990 Certificate
or Dealer Notes (and related assets held by the Master Trust), as the case may
be, will be conveyed and transferred to the Seller.
 
REPORTS TO OFFERED CERTIFICATEHOLDERS
 
     On each Distribution Date related to a Due Period commencing prior to the
1990 Trust Termination Date, the paying agent will forward to each holder of
1990 Trust Investor Certificates (including the Master Trust as holder of the
Related 1990 Certificate) a statement prepared by the Servicer and delivered to
the 1990 Trust Trustee based on information provided by the Servicer setting
forth the following information (which, in the case of (a), (b), (c), (h) and
(i) below, will be stated for each class of 1990 Trust Investor Certificates on
the basis of an original principal amount of $1,000 per certificate and, in the
case of (h) and (i), will also be stated on an aggregate basis):
 
          (a) the total amount of payments;
 
          (b) the principal amount of such payment allocable to principal
     payable in respect of the 1990 Trust Investor Certificates ("Certificate
     Principal");
 
          (c) the amount of such payment allocable to 1990 Trust Investor
     Certificate Interest;
 
          (d) the aggregate amount of Principal Collections processed during the
     related Due Period, and the amount of such Principal Collections which were
     allocated to each class for which a Class Amortization Date has occurred
     (an "Amortizing Class"), if any, deposited in the 1990 Trust Spread Account
     or the Liquidity Reserve Account, used to purchase New Dealer Notes or 1990
     Trust Investment Securities or paid to the Seller;
 
          (e) the aggregate amount of Dealer Finance Charges and NITC Finance
     Charges for the Due Period;
 
          (f) the aggregate amount of Dealer Notes and 1990 Trust Investment
     Securities, the 1990 Trust Total Investor Interest as a percentage of the
     aggregate amount of the Dealer Notes and 1990 Trust Investment Securities
     as of the end of the day on the last day of the related Due Period (after
     giving effect to payments and adjustments made pursuant to the 1990 Trust
     Agreement);
 
          (g) the Class Charged-Off Amount for each class of 1990 Trust Investor
     Certificates for such Distribution Date after giving effect to payments and
     adjustments made pursuant to the 1990 Trust Agreement;
 
          (h) an amount equal to the product of 1990 Trust Principal Losses and
     the 1990 Trust Total Investor Percentage (the "Investor Loss Amount") and
     Class Loss Amounts and the amount by which the Investor Loss Amount and
     Class Loss Amounts have been reduced on the Transfer Date;
 
          (i) the amount of the 1990 Trust Monthly Servicing Fee and the amount
     of the 1990 Trust Monthly Servicing Fee allocable to the 1990 Trust
     Investor Certificates for the related Due Period;
 
          (j) the 1990 Trust Available Subordinated Amount and the 1990 Trust
     Seller Interest;
 
          (k) the amount of Principal Collections on deposit in the 1990 Trust
     Collections Account and the share thereof allocable to each Amortizing
     Class;
 
          (l) the sum of (i) income from 1990 Trust Investment Securities, and
     (ii) income form the investment of funds in the Certificate Series
     Principal Account, the 1990 Trust Distribution Account and the 1990 Trust
     Collections Account, each during such Due Period (the "1990 Trust
     Investment Income") for the Due Period;
 
          (m) the 1990 Trust Deficiency Amount for such Distribution Date after
     giving effect to payments and adjustments made pursuant the 1990 Trust
     Agreement;
 
                                       74
<PAGE>   91
 
          (n) the amount by which (i) the sum of (a) Investor Certificate
     Interest for such Distribution Date and (b) the Deficiency Amount
     immediately prior to such date exceeds (ii) the amount to be paid to the
     Distribution Account (after giving effect to the payments and adjustments
     described herein (the "1990 Trust Deficiency Amount") from the preceding
     Distribution Date being reimbursed on the Distribution Date;
 
          (o) the total amount to be deposited in the 1990 Trust Distribution
     Account in respect of 1990 Trust Investor Certificate Interest on such
     Distribution Date;
 
          (p) each Class Invested Amount and Class Investor Interest after
     giving effect to payments and adjustments made pursuant to the 1990 Trust
     Agreement;
 
          (q) the 1990 Trust Minimum Seller Interest after giving effect to
     payments and adjustments made pursuant to the Agreement;
 
          (r) during any 1990 Trust Amortization Term and with respect to any
     Amortizing Class, the percentage equivalent of a fraction the numerator of
     which is the Class Investor Interest for such Class and the denominator of
     which is the sum of the 1990 Trust Total Investor Interest and the 1990
     Trust Seller Interest, each as of the Class Amortization Date (the "Class
     Amortization Percentages"); and
 
          (s) with respect to Investment Securities in the Collection Account
     and Eligible Investments in the Liquidity Reserve Account, a listing of all
     such investments as of the last day of the Due Period, including specified
     information with respect thereto.
 
     Upon receipt of any such statement in respect of the Related 1990
Certificate, the Master Trust Trustee will forward, or will cause the Servicer
to forward, a copy of such statement to each Offered Certificateholder (which is
expected to be Cede as nominee for DTC unless Definitive Certificates are
issued).
 
     On each Distribution Date, the paying agent will forward to each Offered
Certificateholder (which is expected to be Cede as nominee for DTC unless
Definitive Certificates are issued) a statement prepared by the Servicer and
delivered to the Master Trust Trustee based on information provided by the
Servicer setting forth, among other things, the following information (which,
prior to the 1990 Trust Termination Date, will include only the amounts referred
to in (c), (d) and (e) below and which, in the case of (a), (b), (c), (h) and
(i) below, will be stated on the basis of an original principal amount of $1,000
per Offered Certificate):
 
          (a) the aggregate amount of Collections, including the aggregate
     amount of Finance Charge Collections and the aggregate amount of Principal
     Collections for the related Due Period;
 
          (b) the Series Allocation Percentage, the Floating Allocation
     Percentage and the Principal Allocation Percentage (if applicable) for the
     related Due Period;
 
          (c) the total amount, if any, to be distributed on the Offered
     Certificates on such Distribution Date;
 
          (d) the amount, if any, of such distribution allocable to the Invested
     Amount;
 
          (e) the amount, if any, of such distribution allocable to interest on
     the Offered Certificates;
 
          (f) Dealer Note Losses for the related Due Period;
 
          (g) the Draw Amount as of the related Transfer Date, if any;
 
          (h) the amount of the Certificateholder Charge-Offs and the amount of
     reimbursements thereof as of the related Transfer Date;
 
          (i) the amount of the Offered Series Servicing Fee to be paid on such
     Distribution Date;
 
          (j) the Controlled Deposit Amount for the related Due Period (if
     applicable);
 
          (k) the Invested Amount (after giving effect to all distributions that
     will occur on such Distribution Date);
 
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<PAGE>   92
 
          (l) the aggregate amount of Dealer Notes and funds on deposit in the
     Excess Funding Account as of the end of the last day of the related Due
     Period (after giving effect to payments and adjustments made pursuant to
     the Pooling and Servicing Agreement);
 
          (m) the Available Subordinated Amount and the Negative Carry
     Subordinated Amount (after giving effect to draws thereon on such
     Distribution Date);
 
          (n) with respect to Eligible Investments in the Series Principal
     Account, the Excess Funding Account, the Negative Carry Reserve Fund and
     the Liquidity Reserve Account, a listing of all such investments as of the
     last day of the Due Period, including specified information with respect
     thereto; and
 
          (o) the amount of Remaining Available Seller's Principal Collections,
     the aggregate amount of Excess Seller's Principal Collections and Remaining
     Available Seller's Principal Collections treated as Shared Seller Principal
     Collections, the aggregate amount of shared seller principal collections
     from other Series, and the amount of shared seller principal collections
     allocated to the Offered Certificates and to other Series.
 
     In addition, on or about January 31 of each calendar year (beginning in
1998 with respect to the Offered Certificateholders), the Master Trust Trustee
will furnish to the Servicer and the paying agent a list of each person who at
any time during the preceding calendar year was an Offered Certificateholder and
received any payment thereon and the dates such person held an Offered
Certificate, and the paying agent will furnish to each such Offered
Certificateholder a statement prepared by the paying agent containing the
information required to be provided by an issuer of indebtedness under the Code
for such preceding calendar year or the applicable portion thereof during which
such person was an Offered Certificateholder, together with such other customary
information as is necessary or desirable to enable the Offered
Certificateholders to prepare their tax returns. As long as the holder of record
of the Offered Certificates is Cede, as nominee of DTC, beneficial owners of
Offered Certificates will receive tax and other information from Participants
and Indirect Participants rather than from the Master Trust Trustee or the
Servicer.
 
EVIDENCE AS TO COMPLIANCE
 
     Pursuant to the Applicable Agreement, on or about April 15 of each calendar
year, beginning in April, 1992, the Servicer has caused and will continue to
cause a firm of nationally recognized independent public accountants (who may
also render other services to the Servicer or the Seller) to furnish a report to
the Active Trustee to the effect that they have compared the mathematical
calculations of each amount set forth in each of the monthly certificates
forwarded by the Servicer to the Seller, the Active Trustee and the paying agent
(as required under the Applicable Agreement) during the preceding calendar year
with the computer reports of the Servicer and such accountants are of the
opinion that such amounts are in agreement, except for such exceptions as shall
be set forth in such report. In addition, such a firm has furnished and will
continue to furnish a report to the Active Trustee and the Servicer to the
effect that such firm is of the opinion that the system of internal accounting
controls in effect on the date of such statement relating to the servicing
procedures performed by the Servicer under the Applicable Agreement, taken as a
whole, was sufficient for the prevention and detection of errors and
irregularities which would be material to the assets of the Active Trust and
that nothing has come to their attention that would cause them to believe that
such servicing has not been conducted in compliance with the Applicable
Agreement, except for such exceptions as shall be set forth in such report. The
procedures to be followed by such accountants will not constitute an audit
conducted in accordance with generally accepted auditing standards.
 
     Each of the 1990 Trust Agreement and the Pooling and Servicing Agreement
also requires the Servicer to have delivered to the trustee thereunder, the
Seller and the Rating Agencies, on or about April 15 of each calendar year,
beginning in April, 1992, and within ten business days of the Servicer's
discovery of a Servicer Termination Event, an officer's certificate stating that
(a) in the course of such officer's duties as an officer of the Servicer such
officer would normally obtain knowledge of any Servicer Termination Event and
(b) whether such officer has obtained knowledge of any such Servicer Termination
Event, and, if so, specifying each Servicer Termination Event of which the
signing officer has knowledge and the nature of the Servicer Termination Event.
 
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<PAGE>   93
 
     The Pooling and Servicing Agreement requires the Seller to have delivered
to the Master Trust Trustee, the Servicer and the Rating Agencies, on or about
April 15 of each calendar year, and within ten business days after the Seller
has knowledge of any event discussed below, an officer's certificate stating
that (a) in the course of such officer's duties as an officer of the Seller such
officer would normally obtain knowledge of any 1990 Trust Amortization Event, an
Investment Event or an Early Amortization Event or any breach of the Seller's
covenants in the Pooling and Servicing Agreement and (b) whether such officer
has obtained knowledge of any such 1990 Trust Amortization Event, Investment
Event or Early Amortization Event or breach of covenant, and, if so, specifying
such 1990 Trust Amortization Event, Investment Event or Early Amortization Event
or breach of covenant of which the signing officer has knowledge and the nature
thereof.
 
     The Servicer will give the Master Trust Trustee copies of all statements,
certificates and reports furnished to the 1990 Trust Trustee, and copies
thereof, as well as copies of any statements, certificates, and reports
furnished directly to the Master Trust Trustee, may be obtained by a request in
writing to the Master Trust Trustee addressed to the Corporate Trust Office.
 
INDEMNIFICATION OF MASTER TRUST AND MASTER TRUST TRUSTEE; LIMITATION ON
LIABILITY OF CERTAIN PERSONS
 
     Pursuant to the terms of the Pooling and Servicing Agreement, the Seller
and NFC will indemnify and hold harmless the Master Trust and the Master Trust
Trustee from and against any loss, liability, expense, damage or injury suffered
arising out of the activities of the Master Trust or the Master Trust Trustee,
except that (i) the Seller and NFC will not indemnify the Master Trust or the
Offered Certificateholders for liabilities arising from actions taken by the
Master Trust Trustee at the request of Offered Certificateholders, (ii) the
Seller and NFC will not indemnify the Master Trust or the Master Trust Trustee
for any liability, costs, or expenses of the Master Trust or the Master Trust
Trustee resulting from the Master Trust Trustee's own negligent action, its own
negligent failure to act, or its own misconduct and (iii) the Seller and NFC
will not indemnify the Master Trust or the Offered Certificateholders with
respect to any federal, state, or local income or franchise taxes (or any
interest or penalties with respect thereto) required to be paid by the Offered
Certificateholders. Generally, the 1990 Trust and the 1990 Trust Trustee are
similarly indemnified and held harmless under the 1990 Trust Agreement.
 
     The Agreements provide that no recourse under any obligation or covenant of
the Agreements, or for any claim based thereon, may be had against any
incorporator, director, officer, or stockholder of the Seller or the Servicer.
The Servicer will be under no obligation to appear in, prosecute, or defend any
legal action which is not incidental to its duties under the Agreements which in
the Servicer's reasonable opinion may involve it in any expense or liability.
 
THE MASTER TRUST TRUSTEE
 
     The Prospectus Supplement with respect to each Offered Series will specify
the entity that will act as the Master Trust Trustee under the Pooling and
Servicing Agreement, including the location of its principal office for the
conduct of its corporate trust business (the "Corporate Trust Office") as of the
date of this Prospectus. NFC and its affiliates (other than the Seller) may from
time to time enter into normal banking and trustee relationships with the Master
Trust Trustee. The Master Trust Trustee may not hold certificates issued under
the Master Trust in its own name (but may do so in a fiduciary capacity). In
addition, for purposes of meeting the legal requirements of certain local
jurisdictions, the Master Trust Trustee will have the power to appoint a
co-trustee or separate trustees of all or any part of the Master Trust. In the
event of such appointment, all rights, powers, duties and obligations conferred
or imposed upon the Master Trust Trustee by the Pooling and Servicing Agreement
will be conferred or imposed upon the Master Trust Trustee and such separate
trustee or co-trustee jointly, or, in any jurisdiction in which the Master Trust
Trustee shall be incompetent or unqualified to perform certain acts, singly upon
such separate trustee or co-trustee who will exercise and perform such rights,
powers, duties and obligations solely at the direction of the Master Trust
Trustee.
 
     The Master Trust Trustee may resign at any time upon written notice to the
Seller and the appointment of a successor Master Trust Trustee. In addition, the
Seller may remove the Master Trust Trustee if the Master Trust Trustee ceases to
be eligible to continue as such under the Pooling and Servicing Agreement or
 
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<PAGE>   94
 
if the Master Trust Trustee becomes insolvent. In such circumstances, the Seller
will be obligated to appoint a successor Master Trust Trustee. Any resignation
or removal of the Master Trust Trustee and appointment of a successor Master
Trust Trustee does not become effective until acceptance of the appointment by
the successor Master Trust Trustee.
 
AMENDMENTS
 
     The Pooling and Servicing Agreement or any Supplement may be amended by the
Seller, the Servicer and the Master Trust Trustee without the consent of the
Certificateholders of any Series, provided such action will not, as evidenced by
an officer's certificate of the Servicer, have a material adverse effect on the
interests of the Certificateholders of such Series.
 
     The Pooling and Servicing Agreement or Supplement may also be amended by
the Seller, the Servicer and the Master Trust Trustee with the consent of the
holders of certificates evidencing not less than 66 2/3% of the aggregate series
invested amounts of the certificates of each adversely affected Series for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of the Pooling and Servicing Agreement or of modifying in any
manner the rights of Certificateholders. No such amendment, however, may (a)
reduce in any manner the stated amount of, or delay the stated timing of,
distributions required to be made on any certificate or the stated amount
available under any Enhancement without the consent of the holder of such
certificate, (b) change the manner of calculating the Certificateholder's
Interest of any Series without the consent of all Certificateholders of the
adversely affected Series, (c) adversely affect the rating of any Series or
class of any Rating Agency without the consent of two-thirds of the voting
interests of such Series or class or (d) reduce the aforesaid percentages of the
voting interests required to consent to such amendment without the consent of
each Certificateholder. Promptly following the execution of an amendment
described in this paragraph, the Master Trust Trustee will furnish written
notice of the substance of such amendment to each Certificateholder.
 
     The 1990 Trust Agreement may be amended by NFC, the Seller and the 1990
Trust Trustee, without consent of the holders of the 1990 Trust Investor
Certificates, to cure any ambiguity or to correct or supplement any defective or
inconsistent provision therein or to add any other provisions with respect to
matters or questions arising under the Agreement which are not inconsistent with
the provisions of the 1990 Trust Agreement. No such amendment, however, may
adversely affect in any material respect the interest of the holders of the 1990
Trust Investor Certificates.
 
     The 1990 Trust Agreement may also be amended by NFC, the Seller and the
1990 Trust Trustee with the consent of the holders of 1990 Trust Investor
Certificates evidencing fractional undivided interests aggregating not less than
66 2/3% of the 1990 Trust Total Invested Amount for the purpose of adding any
provisions to, changing in any manner, or eliminating any of the provisions of
the Agreement or modifying in any manner the rights of holders of 1990 Trust
Investor Certificates. No such amendment, however, may (a) reduce in any manner
the amount of, or delay the timing of, distributions required to be made on any
1990 Trust Investor Certificate, (b) change the definition of or the manner of
calculating the Class Investor Interest, the 1990 Trust Total Investor Interest,
the Class Invested Amount, the 1990 Trust Total Invested Amount, the 1990 Trust
Total Investor Percentage, the Class Amortization Percentage, the Class Charged-
Off Amount, the Class Loss Amount, the 1990 Trust Investor Loss Amount, or the
1990 Trust Minimum Seller Interest or (c) reduce the aforesaid percentage
required to consent to any such amendment, in each case without the consent of
each holder of a 1990 Trust Investor Certificate. Promptly following the
execution of any amendment to the 1990 Trust Agreement, the 1990 Trust Trustee
will furnish written notice of the substance of such amendment to each holder of
a 1990 Trust Investor Certificate.
 
VOTING OF THE MASTER TRUST'S INTERESTS IN THE 1990 TRUST
 
     The Master Trust Trustee will have the right, without the consent of the
Certificateholders, to vote, or to consent or withhold consent with respect to,
the Class A-4 Certificate and any Related 1990 Certificate on any matter for
which votes or consents are solicited under the 1990 Agreement, provided that
such action will not,
 
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<PAGE>   95
 
as evidenced by an officer's certificate of the Servicer, have a material
adverse effect on the Certificateholders of any Series.
 
     The Master Trust Trustee will also have the right, with the consent of the
Applicable Voting Percentage of the Certificateholders, to vote, or to consent
or withhold consent, with respect to the Class A-4 Certificate and any Related
1990 Certificate on any matter for which votes or consents are solicited under
the 1990 Agreement.
 
          "Applicable Voting Percentage" means, with respect to any matter for
     which votes or consents are solicited under the 1990 Agreement, the
     percentage of votes or consents of the 1990 Trust Investor Certificates
     needed to pass the proposed matter.
 
AMENDMENT TO SELLER CERTIFICATE OF INCORPORATION
 
     The Pooling and Servicing Agreement authorizes the Seller to amend and
restate its Certificate of Incorporation to allow it greater flexibility in
certain respects than it now enjoys. The amended and restated Certificate of
Incorporation will clarify the degree to which the Seller may incur additional
indebtedness, will provide that further amendments to the amended and restated
Certificate of Incorporation may be effected upon satisfaction of the Rating
Agency Condition with respect to all outstanding rated securities, and will
expand in limited respects the types of securitization transactions in which the
Seller may engage. The Seller intends to file the amended and restated
Certificate of Incorporation no later than the Distribution Date following the
1990 Trust Termination Date. The Seller believes that each of these provisions
is consistent with the establishment of NFSC as a limited purpose corporation.
The amended and restated Certificate of Incorporation will be substantially in
the form of an exhibit to the Pooling and Servicing Agreement, a copy of which
may be obtained from the Master Trust Trustee upon request.
 
LIST OF CERTIFICATEHOLDERS
 
     In the event that Definitive Certificates are issued, upon written request
of three or more Certificateholders of record, and after having been adequately
indemnified by such Certificateholders for its costs and expenses, the Master
Trust Trustee will afford such Certificateholders access, during normal business
hours, to the current list of Certificateholders for purposes of communicating
with other Certificateholders with respect to their rights under the Pooling and
Servicing Agreement.
 
SELLER AUTHORIZED TO FILE REPORTS PURSUANT TO SECURITIES EXCHANGE ACT
 
     The Seller is authorized to file on behalf of the Master Trust all reports
required to be filed with the Commission or any exchange or association of
securities dealers pursuant to the Exchange Act, or any rules or regulations
thereunder. The Seller does not intend to maintain registration of the Offered
Certificates under the Exchange Act if it becomes unnecessary to do so.
 
CERTAIN LIMITATIONS ON RIGHTS OF CERTIFICATEHOLDERS
 
     Except as otherwise described in "Amendments," no Certificateholder will
have any right to vote or control in any manner the operation and management of
the Master Trust, or the obligations of the parties thereto. The Pooling and
Servicing Agreement does not provide for any annual or other meeting of the
Certificateholders.
 
GOVERNING LAW
 
     The Master Trust will be administered by the Master Trust Trustee in
accordance with the internal laws of the State of Illinois, without reference to
its conflict of law provisions.
 
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<PAGE>   96
 
                 TERMS OF THE 1990 TRUST INVESTOR CERTIFICATES
 
     Pursuant to the terms of the 1990 Trust Agreement, each 1990 Trust Investor
Certificate represents a fractional undivided interest in the 1990 Trust,
including the right to receive a floating percentage of NITC Finance Charges,
Dealer Finance Charge Collections, and, with respect to any Amortizing Class, a
fixed percentage of Principal Collections. The 1990 Trust assets include the
Eligible Dealer Notes existing as of the associated Closing Date, any Eligible
Dealer Notes subsequently transferred to the 1990 Trust and all monies due or to
become due with respect thereto, the interest of the Seller in the security
interests in the related Financed Vehicles, all proceeds of the Dealer Notes
(including Insurance Proceeds), the 1990 Trust Investment Securities and such
funds as from time to time are deposited in certain accounts.
 
     The 1990 Trust Seller Certificate represents the 1990 Trust Seller
Interest. The 1990 Trust Seller Interest represents that fractional undivided
interest in the 1990 Trust which is not represented by the 1990 Trust Investor
Certificates, including the right to receive a floating percentage of NITC
Finance Charges, Dealer Finance Charge Collections and, upon amortization,
Principal Collections, subject to the subordination of a portion of its interest
to the interests of the holders of 1990 Trust Investor Certificates.
 
     1990 Trust Investor Certificate Interest on the 1990 Trust Investor
Certificates will be paid on the twenty-fifth day of each month, or if such
twenty-fifth day is not a Business Day, the next Business Day thereafter.
Interest accrues on the unpaid principal amount of each class of 1990 Trust
Investor Certificates at a per annum rate equal to LIBOR plus the "Class
Certificate Margin" (which is set forth in the Prospectus Supplement) (the
"Class Certificate Rate") for such class (calculated on the basis of a 360-day
year of twelve 30-day months).
 
     The Class Amortization Date for any class of 1990 Trust Investor
Certificates (on which date the 1990 Trust related Amortization Period will
commence) is the earlier of (i) the Scheduled Class Amortization Date for such
class or (ii) the date on which a 1990 Trust Amortization Event occurs. Once an
Amortization Period has commenced for any class of 1990 Trust Investor
Certificates, monthly principal payments to holders of such class will begin on
the Distribution Date related to the Due Period in which the Class Amortization
Date occurred. Principal payments on the Class A-1 Investor Certificates began
on January 27, 1997, and the Class A-1 Investor Certificates have been paid in
full. Principal payments with respect to the Class A-2 and Class A-3 Investor
Certificates are scheduled to begin on January 26, 1998 and January 25, 1999,
respectively. Because the 1990 Trust Termination Date is expected to occur prior
to the Class Amortization Dates for the Class A-4 Investor Certificate or the
Related 1990 Certificates, no scheduled principal payments are expected to be
made on the Class A-4 Investor Certificate or the Related 1990 Certificates.
 
TRUST ACCOUNTS
 
     General. Pursuant to the terms of the 1990 Trust Agreement and the 1990
Trust Interest Deposit Agreement, the 1990 Trust Trustee has established or will
establish six different trust accounts (collectively, the "Trust Accounts"),
each as further described below for the benefit of each class of 1990 Trust
Investor Certificates. Each Trust Account will be a non-interest bearing
segregated account established with the trust department of the 1990 Trust
Trustee or with an office or branch of a depository institution organized under
the laws of the United States of America or any one of the states thereof which
at all times has a short-term certificate of deposit rating of A-1+/P-1 or
better by Standard & Poor's Ratings Group and Moody's Investors Service, Inc.,
respectively, and whose deposits are insured by the Federal Deposit Insurance
Corporation, acting through either the Savings Association Insurance Fund or the
Bank Insurance Fund or any fund established by a United States government
regulatory body or agency succeeding to the function thereof (the "FDIC"), or
any successor thereto (a "Qualified Institution") (which Qualified Institution
may be the 1990 Trust Trustee). The Servicer will have the revocable power to
instruct the 1990 Trust Trustee to withdraw funds from the Trust Accounts for
the purpose of carrying out its duties under the 1990 Trust Agreement and the
1990 Trust Interest Deposit Agreement. Funds on deposit overnight or for a
longer period in a Trust Account will be invested in Eligible Investments with a
stated maturity, if any, within a period from the date of issuance thereof
approved by the Rating Agencies on or prior to the Transfer Date on which the
funds
 
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<PAGE>   97
 
represented thereby are to be deposited in the 1990 Trust Distribution Account
pursuant to the 1990 Trust Agreement, except that with respect to any funds on
deposit in the 1990 Trust Interest Deposit Account, any Eligible Investment must
mature no later than two business days after the end of each Due Period. (Funds
on deposit in the 1990 Trust Interest Deposit Account are subject to certain
other restrictions as specified in the 1990 Trust Interest Deposit Agreement).
Net interest and earnings (less investment expenses) on all such deposited funds
will be included in the calculation of 1990 Trust Investment Income for the
relevant Due Period, except that with respect to the 1990 Trust Spread Account
and the 1990 Trust Interest Deposit Account, all such interest and earnings will
be added to the amounts on deposit in each of the 1990 Trust Spread Account and
the 1990 Trust Interest Deposit Account, respectively.
 
     1990 Trust Distribution Account, Collections Account, and Certificate
Principal Account. The 1990 Trust Trustee has established and will maintain in
the name of the 1990 Trust (a) for the benefit of the holders of 1990 Trust
Investor Certificates, (i) a "1990 Trust Distribution Account," from which all
payments to holders of 1990 Trust Investor Certificates will be made and (ii) a
"Certificate Principal Account," which account will serve as the depository for
all Principal Collections allocated to an Amortizing Class until otherwise
transferred to the 1990 Trust Distribution Account on the Transfer Date and (b)
for the benefit of the holders of 1990 Trust Investor Certificates, a "1990
Trust Collections Account," which will serve as the initial depository for all
NITC Finance Charges, Dealer Finance Charge Collections and 1990 Trust Principal
Collections (collectively, the "1990 Trust Collections").
 
     1990 Trust Liquidity Reserve Account. The 1990 Trust Trustee, for the
benefit of the Seller, will establish (on or prior to the commencement of a 1990
Trust Early Amortization Period) and maintain in the name of the 1990 Trust a
"1990 Trust Liquidity Reserve Account." During a 1990 Trust Early Amortization
Period, all Principal Collections that would otherwise be used for Acquisitions
or paid to the Seller will be deposited in the 1990 Trust Liquidity Reserve
Account until such time as the amount on deposit is equal to the 1990 Trust
Available Subordinated Amount, in order to assure a source of funds for credit
enhancement on the 1990 Trust Investor Certificates. The Seller will possess all
right, title and interest in all funds on deposit in the 1990 Trust Liquidity
Reserve Account, except that no funds on deposit will be paid to the Seller
during a 1990 Trust Early Amortization Period if such payment would reduce the
funds in the 1990 Trust Liquidity Reserve Account below an amount equal to the
1990 Trust Available Subordinated Amount (see " -- Limited Subordination of the
1990 Trust Seller Interest; 1990 Trust Available Subordinated Amount" and
" -- 1990 Trust Amortization Events").
 
     1990 Trust Spread Account. The 1990 Trust Trustee has established and will
maintain in the name of the 1990 Trust, for the benefit of the holders of the
1990 Trust Investor Certificates, a "1990 Trust Spread Account," which account
will be funded at all times with an amount equal to at least 1.25% of the 1990
Trust Total Invested Amount. The funds on deposit will be increased if, as of
the first day of the calendar month in which the Distribution Date occurs or, if
such first day is not a business day, the next business day thereafter, the sum
of the aggregate 1990 Trust Investor Certificate Interest for each class of 1990
Trust Investor Certificates and the 1990 Trust Servicing Fee, in each case as
projected for all classes of 1990 Investor Certificates for the Distribution
Period, and the product of (a) 1.0% per annum calculated on the basis of a
360-day year and twelve 30-day months and (b) the principal amount of Dealer
Notes outstanding exceeds the projected income from the 1990 Trust's portfolio
of Dealer Notes for the related Due Period. The "1990 Trust Projected Spread" is
equal to any such excess plus 1.25% of the 1990 Trust Total Invested Amount. If
the 1990 Trust Projected Spread is greater than the amount on deposit in the
1990 Trust Spread Account (the "1990 Trust Spread Account Deposit"), the
Servicer will withdraw from the 1990 Trust Collections Account all Principal
Collections remaining after deposits in the Certificate Principal Account of
Principal Collections allocable to any Amortizing Class and deposit such
Principal Collections in the 1990 Trust Spread Account until the amount of the
1990 Trust Spread Account Deposit equals the 1990 Trust Projected Spread;
however, if the 1990 Trust Spread Account Deposit is greater than the 1990 Trust
Projected Spread, the Servicer will withdraw the amount of such excess from the
1990 Trust Spread Account, deposit such excess in the 1990 Trust Collections
Account, and apply it as Principal Collections for the current Due Period in
accordance with the 1990 Trust Agreement. See "Terms of the 1990 Trust Investor
Certificates -- Application of Collections."
 
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<PAGE>   98
 
1990 TRUST AMORTIZATION EVENTS
 
     The occurrence of a 1990 Trust Amortization Event is the only circumstance
under which a 1990 Trust Amortization Term will commence prior to a Scheduled
Class Amortization Date. The "Scheduled Class Amortization Date" for each of the
Class A-2 and Class A-3 Investor Certificates is December 1, 1997, December 1,
1998, respectively, for the Class A-4 Investor Certificate, the earlier of (a)
August 25, 2004 and (b) the date on which there occurs any Early Amortization
Event or Investment Event with respect to the Series of certificates issued by
the Master Trust related to the Class A-4 Investor Certificate, and, for a
Related 1990 Certificate and for any other class of 1990 Trust Investor
Certificates issued to the Master Trust, will be set forth in the Prospectus
Supplement. The Scheduled Class Amortization Date for the Class A-1 Investor
Certificates occurred on December 1, 1996, and such certificates have been paid
in full. The first Distribution Date of a 1990 Trust Early Amortization Period
will be the Distribution Date related to the Due Period in which the 1990 Trust
Amortization Event takes place. During a 1990 Trust Early Amortization Period,
all Principal Collections that would otherwise be paid to the Seller pursuant to
the 1990 Trust Agreement will instead be deposited in the 1990 Trust Liquidity
Reserve Account until such time as the amount on deposit in the 1990 Trust
Liquidity Reserve Account is equal to the 1990 Trust Available Subordinated
Amount.
 
     A "1990 Trust Amortization Event" is defined under the 1990 Trust Agreement
as any one of the following events occurring prior to the 1990 Trust Termination
Date:
 
          (a) failure on the part of the Seller (i) to make any payment,
     distribution or deposit required under the 1990 Trust Agreement (or within
     five business days thereafter) or (ii) to observe or perform in any
     material respect any other material covenants or agreements of the Seller,
     which continues unremedied for a period of 60 days after written notice of
     such failure shall have been given to the Seller;
 
          (b) any representation or warranty made by the Seller pursuant to the
     1990 Trust Agreement or any information contained in the schedule of Dealer
     Notes delivered thereunder (or any supplement thereto) shall prove to have
     been incorrect in any material respect when made or when delivered, which
     representation, warranty or schedule, or the circumstances or condition
     that caused such representation, warranty or schedule to be incorrect,
     continues to be incorrect or uncured in any material respect for a period
     of 60 days after written notice of such incorrectness shall have been given
     to the Seller;
 
          (c) certain events of bankruptcy, insolvency or receivership involving
     any of the Seller, NFC, NITC or NIC;
 
          (d) the Seller shall become legally unable for any reason to transfer
     Dealer Notes to the 1990 Trust in accordance with the provisions of the
     1990 Trust Agreement;
 
          (e) the 1990 Trust Available Subordinated Amount is reduced to less
     than 87.1% of the 1990 Trust Maximum Subordinated Amount;
 
          (f) the 1990 Trust becomes an "investment company" within the meaning
     of the Investment Company Act of 1940, as amended, and shall not be exempt
     from compliance with such Act;
 
          (g) any 1990 Trust Servicer Termination Event shall occur (i) which
     would have a material adverse effect on the holders of 1990 Trust Investor
     Certificates and (ii) for which the Servicer has received a notice of
     termination;
 
          (h) at the end of any Due Period the 1990 Trust Seller Interest is
     reduced to an amount less than the 1990 Trust Minimum Seller Interest and
     the Seller has failed to assign additional Dealer Notes to the 1990 Trust
     in the amount of such deficiency within ten business days following the end
     of such Due Period;
 
          (i) by reference to the Coverage Differentials (defined generally as
     the excess of the annualized yield on the dealer notes over an amount equal
     to the weighted average interest payable on the outstanding classes of 1990
     Trust Investor Certificates for each of the related Due Period and the
     three immediately preceding Due Periods), the sum of the three highest such
     Coverage Differentials divided by
 
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<PAGE>   99
 
     three (the "Average Coverage Differential") shall be equal to or less than
     negative two percent (2%) on each of three consecutive Determination Dates;
 
          (j) on any Determination Date, the result of (i) the product of (A)
     the sum of Dealer Note Collections for each of the related Due Period and
     for the two immediately preceding Due Periods and (B) four divided by (ii)
     the daily average principal amount of Dealer Notes outstanding during such
     Due Periods ("Turnover") is less than 1.7;
 
          (k) on any Determination Date, the quotient of (i) the sum of 1990
     Trust Dealer Note Losses for each of the related Due Period and the five
     immediately preceding Due Periods and (ii) the sum of Principal Collections
     for each of the related Due Period and the five immediately preceding Due
     Periods, is greater than or equal to 1%; or
 
          (l) failure on the part of NITC to make a deposit in the 1990 Trust
     Interest Deposit Account required by the terms of the 1990 Trust Interest
     Deposit Agreement on or before the date occurring five business days after
     the date such deposit is required by the 1990 Trust Interest Deposit
     Agreement to be made.
 
     In the case of any event described in clause (a) or (b) above, a 1990 Trust
Amortization Event will be deemed to have occurred only if, after the applicable
grace period expires, either the 1990 Trust Trustee or holders of 1990 Trust
Investor Certificates evidencing fractional undivided interests aggregating not
less than 51% of the 1990 Trust Total Invested Amount by written notice to the
Seller and the Servicer (and to the 1990 Trust Trustee if given by the holders
of 1990 Trust Investor Certificates), declare that a 1990 Trust Amortization
Event has occurred as of the date of such notice, and in the case of any other
event described above, a 1990 Trust Amortization Event will be deemed to have
occurred without any notice or other action on the part of the 1990 Trust
Trustee or the holders of 1990 Trust Investor Certificates immediately upon the
occurrence of such event. Upon the occurrence of a 1990 Trust Amortization
Event, a "1990 Trust Early Amortization Period" will commence.
 
LIMITED SUBORDINATION OF THE 1990 TRUST SELLER INTEREST; 1990 TRUST AVAILABLE
SUBORDINATED AMOUNT
 
     The right of the holder of the 1990 Trust Seller Certificate to receive
payments in respect of the 1990 Trust Seller Interest is subordinated to the
interests of holders of the 1990 Trust Investor Certificates to the extent of
the 1990 Trust Available Subordinated Amount. The "1990 Trust Available
Subordinated Amount" for the Distribution Date immediately preceding the related
Closing Date will be set forth in the Prospectus Supplement. As amounts are made
available for the benefit of the holders of the 1990 Trust Investor Certificates
from the subordinated portion of the 1990 Trust Seller Interest, the 1990 Trust
Available Subordinated Amount and, in certain circumstances, the 1990 Trust
Seller Interest, will be reduced. In subsequent Due Periods, the 1990 Trust
Available Subordinated Amount may be reinstated by payments of 1990 Trust Excess
Servicing to the holder of the 1990 Trust Seller Certificate (but in no event to
exceed the 1990 Trust Maximum Subordinated Amount).
 
     As further protection for the holders of the 1990 Trust Investor
Certificates, the 1990 Trust Agreement requires the 1990 Trust Seller Interest
to be maintained at an amount equal to (a) the greater of (i) 118.5% of the sum
of the Class Initial Invested Amounts for all outstanding classes of 1990 Trust
Investor Certificates and (ii) after the earlier of the Scheduled Class
Amortization Date for such class and the date on which a 1990 Trust Amortization
Event occurs (the "Class Amortization Date"), 90% of the sum of the 1990 Trust
Total Invested Amount and the 1990 Trust Seller Interest as of such Class
Amortization Date, minus (b) the 1990 Trust Total Invested Amount (the "1990
Trust Minimum Seller Interest"). Therefore, if any payment to the Seller
pursuant to the 1990 Trust Agreement would reduce the 1990 Trust Seller Interest
to an amount below the 1990 Trust Minimum Seller Interest, rather than making
such payment to the holder of the 1990 Trust Seller Certificate, such payment
will instead, to the extent necessary to maintain the 1990 Trust Seller
 
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<PAGE>   100
 
Interest at an amount equal to the 1990 Trust Minimum Seller Interest, be
invested by the 1990 Trust Trustee in 1990 Trust Investment Securities.
 
          "1990 Trust Investment Securities" means investments of Principal
     Collections in Eligible Investments necessary in order to maintain the 1990
     Trust Seller Interest at an amount not less than the 1990 Trust Minimum
     Seller Interest.
 
     Generally, the maximum 1990 Trust Available Subordinated Amount (the "1990
Trust Maximum Subordinated Amount") will equal 15.5% of the 1990 Trust Total
Invested Amount. Therefore, as Principal Collections during a 1990 Trust
Amortization Term reduce the 1990 Trust Total Invested Amount, the 1990 Trust
Maximum Subordinated Amount will be proportionately reduced. However, if on any
date (a) the sum of (i) the difference between the 1990 Trust Maximum
Subordinated Amount and the 1990 Trust Available Subordinated Amount, each as of
such Class Amortization Date, and (ii) the aggregate amount of reductions to the
1990 Trust Available Subordinated Amount due to principal losses or interest
deficiencies after such Class Amortization Date exceeds (b) 2% of the 1990 Trust
Total Invested Amount as of such date, the 1990 Trust Maximum Subordinated
Amount will not decline until the 1990 Trust Total Invested Amount equals the
1990 Trust Maximum Subordinated Amount, and thereafter the 1990 Trust Maximum
Subordinated Amount will equal the 1990 Trust Total Invested Amount. In
addition, if only one class of 1990 Trust Investor Certificates is outstanding,
the 1990 Trust Maximum Subordinated Amount will not be reduced below the 1990
Trust Minimum Subordinated Amount until the 1990 Trust Total Invested Amount
equals such 1990 Trust Minimum Subordinated Amount, and thereafter the 1990
Trust Maximum Subordinated Amount will decline dollar for dollar with the 1990
Trust Total Invested Amount. The "1990 Trust Minimum Subordinated Amount" will
equal 6% of the Class Initial Invested Amount of such outstanding class.
 
     Notwithstanding the foregoing, if a 1990 Trust Amortization Event occurs,
the 1990 Trust Maximum Subordinated Amount will remain at its then current level
until the 1990 Trust Total Invested Amount is reduced to such level, whereupon
the 1990 Trust Maximum Subordinated Amount will decline dollar for dollar with
the 1990 Trust Total Invested Amount.
 
     For any Due Period, the 1990 Trust Available Subordinated Amount will be
the lesser of (a) the 1990 Trust Maximum Subordinated Amount at the end of the
immediately preceding Due Period and (b) the 1990 Trust Available Subordinated
Amount at the end of the immediately preceding Due Period after adjusting for
any payments by the 1990 Trust described herein.
 
NON-AMORTIZATION PERIOD; AMORTIZATION TERM
 
     During any period in which no class of 1990 Trust Investor Certificates is
amortizing (a "Non-Amortization Period"), all Dealer Notes and 1990 Trust
Investment Securities will be treated alike, and there will be no principal
payments made with respect to any class. Upon the occurrence of any Scheduled
Class Amortization Date or, if earlier, a 1990 Trust Amortization Event, a 1990
Trust Amortization Term will commence, and each Amortizing Class will begin to
receive monthly payments of principal in addition to interest. If the 1990 Trust
Amortization Event has commenced by reason of a Scheduled Class Amortization
Date, the remaining classes (each a "Non-Amortizing Class") will continue to
receive monthly payments of interest, without payment of principal. A 1990 Trust
Amortization Term will end on the date on which the final distribution to the
holders of the 1990 Trust Investor Certificates of any Amortizing Class is made.
 
COLLECTIONS
 
     NITC Finance Charges; Dealer Finance Charge Collections. On the NITC
Interest Transfer Date, the Servicer will direct the 1990 Trust Trustee to
withdraw from the 1990 Trust Interest Deposit Account and deposit in the 1990
Trust Collections Account an amount equal to the NITC Finance Charges for the
immediately preceding Due Period. In addition, the Servicer will deposit all
Dealer Finance Charge Collections in the 1990 Trust Collections Account within
two business days of receipt thereof, net of any Dealer Finance Charge
Collections that represent Advance Reimbursements. Finally, the Servicer will
deposit any Advance for the Due Period in the 1990 Trust Collections Account on
the Transfer Date.
 
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<PAGE>   101
 
     Principal Collections. Each business day during the Non-Amortization
Period, the Servicer will deposit all Principal Collections in the 1990 Trust
Collections Account within two business days of receipt thereof. The Servicer
will first utilize such Principal Collections to make any necessary payments to
the 1990 Trust Spread Account. To the extent available, the Servicer will next
utilize Principal Collections to acquire all available Dealer Notes from the
Seller. Finally, the Principal Collections remaining in the 1990 Trust
Collections Account after giving effect to all payments and adjustments
described in this paragraph will be paid to the Seller and the 1990 Trust Seller
Interest will be reduced by the amount of such payment, except that if the 1990
Trust Seller Interest is reduced to an amount equal to the 1990 Trust Minimum
Seller Interest, any remaining Principal Collections in the 1990 Trust
Collections Account will be held as 1990 Trust Investment Securities (which 1990
Trust Investment Securities will mature on or prior to the Transfer Date related
to the Due Period in which they are acquired).
 
     Each business day during an Amortization Term, the Servicer will deposit
all Principal Collections in the 1990 Trust Collections Account within two
business days of receipt thereof. For each Amortizing Class, the Servicer will
direct the 1990 Trust Trustee to withdraw from the 1990 Trust Collections
Account and deposit in the Certificate Principal Account an amount equal to the
product of the amount of Dealer Note Collections deposited in the 1990 Trust
Collections Account since the preceding business day and the Class Amortization
Percentage for such Amortizing Class. Except as provided below, the remaining
Principal Collections in the 1990 Trust Collections Account will be (a) first,
deposited in the 1990 Trust Spread Account if any payment to the 1990 Spread
Account is necessary pursuant to the terms of the 1990 Trust Agreement, (b)
second (except in certain limited circumstances), used to acquire Dealer Notes
and (c) third, paid to the Seller (subject to the terms and conditions described
in the preceding paragraph). During a 1990 Trust Early Amortization Period, any
amount that would otherwise be used for Acquisitions or paid to the Seller will
instead be deposited in the 1990 Trust Liquidity Reserve Account, until the
amount of funds in such Account equals the 1990 Trust Available Subordinated
Amount.
 
     On each Transfer Date during a 1990 Trust Amortization Term, for each
Amortizing Class, the Servicer will direct the 1990 Trust Trustee to deposit in
the Certificate Principal Account an amount equal to the product of the
principal amount of the proceeds of 1990 Trust Investment Securities maturing on
such Transfer Date (after giving effect to any payments made for the benefit of
holders of 1990 Trust Investor Certificates) and the Class Amortization
Percentage for such Amortizing Class, except that the Servicer will not direct
the 1990 Trust Trustee to make such a transfer if, after giving effect to such
transfer, the 1990 Trust Seller Interest would be reduced to less than the 1990
Trust Minimum Seller Interest. The remaining proceeds will be deposited in the
1990 Trust Spread Account, used to acquire Dealer Notes or paid to the Seller in
accordance with the 1990 Trust Agreement.
 
APPLICATION OF COLLECTIONS
 
     1990 Trust Monthly Servicing Fee; Advance Reimbursements. On each Transfer
Date, prior to making any payments in accordance with the terms and conditions
described in this section, the 1990 Trust Monthly Servicing Fee for the Due
Period and any unpaid Advance Reimbursements will be paid to the Servicer (such
payment will be paid from NITC Finance Charges and Dealer Finance Charge
Collections).
 
     1990 Trust Investor Certificate Interest. The primary source for the
payment of 1990 Trust Investor Certificate Interest, with respect to any Due
Period, will be "1990 Trust Investor Interest Income," which will equal the
product of (a) the amount by which 1990 Trust Interest Income exceeds the sum of
the 1990 Trust Monthly Servicing Fee, Advance Reimbursements and 1990 Trust
Excess Servicing as of the related Determination Date and (b) the 1990 Trust
Total Investor Percentage. If the amount of 1990 Trust Investor Interest Income
to be deposited in the 1990 Trust Distribution Account on any Transfer Date is
less than accrued and unpaid 1990 Trust Investor Certificate Interest, funds
from the following sources will be paid to the 1990 Trust Distribution Account
for the benefit of the holders of 1990 Trust Investor Certificates up to the
amount of the 1990 Trust Available Subordinated Amount (and in each case such
payment to the 1990 Trust Distribution Account will be made only to the extent
of the remaining deficiency and in no event will such payment exceed the
remaining 1990 Trust Available Subordinated Amount, which will be reduced by the
amount of any such payment): (i) first, from 1990 Trust Seller Interest Income,
if any, (ii) second, through a
 
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<PAGE>   102
 
cash withdrawal from the 1990 Trust Spread Account, (iii) third, from the
proceeds of 1990 Trust Investment Securities maturing on the Transfer Date and
(iv) fourth, during a 1990 Trust Amortization Term, through a cash withdrawal
from the 1990 Trust Liquidity Reserve Account (and each payment pursuant to
clauses (ii), (iii) and (iv) will reduce the 1990 Trust Seller Interest by the
amount of such payment).
 
     1990 Trust Deficiency Amounts. If on any Transfer Date there is a
previously existing 1990 Trust Deficiency Amount and the amount deposited in the
1990 Trust Distribution Account pursuant to the preceding paragraph is equal to
1990 Trust Investor Certificate Interest for the Distribution Period, then 1990
Trust Excess Servicing will be used to reduce the 1990 Trust Deficiency Amount.
If a deficiency remains, funds from the following sources will be paid to the
1990 Trust Distribution Account for the benefit of the holders of 1990 Trust
Investor Certificates, up to the amount of the 1990 Trust Available Subordinated
Amount (and in each case such payment to the 1990 Trust Distribution Account
will be made only to the extent of the remaining deficiency and in no event will
such payment exceed the remaining 1990 Trust Available Subordinated Amount,
which will be reduced by the amount of any such payment): (a) first, from 1990
Trust Seller Interest Income, if any, (b) second, through a cash withdrawal from
the 1990 Trust Spread Account, (c) third, from the proceeds of 1990 Trust
Investment Securities maturing on the Transfer Date and (d) fourth, during a
1990 Trust Amortization Term, through a cash withdrawal from the 1990 Trust
Liquidity Reserve Account (and each payment pursuant to clauses (b), (c) and (d)
will reduce the 1990 Trust Seller Interest by the amount of such payment). Any
1990 Trust Deficiency Amount remaining after giving effect to the payments
described in this paragraph and the preceding paragraph will be allocated among
the classes of 1990 Trust Investor Certificates pro rata according to Class
Investor Interests as of the beginning of the Due Period and each class of 1990
Trust Investor Certificates' pro rata share of the 1990 Trust Deficiency Amount
will not be available for distribution to such class.
 
          "Class Investor Interest" means, on any date during any Due Period
     with respect to any class of 1990 Trust Investor Certificates, an amount
     equal to the related Class Initial Invested Amount minus the sum of (a) the
     aggregate amount on deposit in the Certificate Principal Account allocable
     to the holders of such class on such date, (b) the aggregate amount of
     payments of Certificate Principal paid to such class prior to such Due
     Period, (c) the aggregate amount of Class Charged-off Amounts not
     reimbursed prior to such Due Period (after giving effect to the payments
     and adjustments described herein), and (d) the aggregate amount of
     Certificate Principal Account Losses, allocable to the respective class of
     1990 Trust Investor Certificates.
 
          "Certificate Principal Account Losses" means losses of principal on
     investments of funds on deposit in the Certificate Principal Account. If
     there is more than one Amortizing Class during any Due Period, Certificate
     Principal Account Losses will be allocated pro rata on the basis of Class
     Investor Interests.
 
     1990 Trust Principal Losses -- 1990 Trust Non-Amortization Period. On each
Transfer Date during which a 1990 Trust Amortization Period is not occurring
(the "1990 Trust Non-Amortization Period") the Servicer will determine the
amount of 1990 Trust Principal Losses allocable to the holders of 1990 Trust
Investor Certificates on the basis of the 1990 Trust Total Investor Percentage
(the "1990 Trust Investor Loss Amount").
 
          "1990 Trust Principal Losses" means, with respect to any Due Period,
     the sum of (a) the Dealer Note Losses and (b)ws the aggregate amount of
     losses on the sale of 1990 Trust Investment Securities; provided, however,
     the 1990 Trust Principal Losses will not include Certificate Principal
     Account Losses.
 
          "1990 Trust Amortization Period" means, for a class of 1990 Trust
     Investor Certificates, the period during which such class is amortizing.
 
     Any such 1990 Trust Investor Loss Amount will be allocated to the Seller
through a payment to the Seller of an amount of 1990 Trust Excess Servicing, if
any remains after giving effect to the payments described above, equal to the
1990 Trust Investor Loss Amount, in exchange for an equal amount of the 1990
Trust Seller Interest. Both the 1990 Trust Seller Interest and the 1990 Trust
Investor Loss Amount will be reduced by the amount of such payment. If the
available 1990 Trust Excess Servicing is less than the 1990 Trust Investor Loss
Amount, the 1990 Trust Seller Interest will be further reduced by an amount
equal to the
 
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<PAGE>   103
 
lesser of (a) the 1990 Trust Available Subordinated Amount (after giving effect
to any previous increases or decreases therein) and (b) the remaining 1990 Trust
Investor Loss Amount. The 1990 Trust Investor Loss Amount and the 1990 Trust
Available Subordinated Amount each will be reduced by the amount of such further
reduction in the 1990 Trust Seller Interest.
 
     1990 Trust Principal Losses-Amortization Term. On each 1990 Trust Transfer
Date during any period during which a 1990 Trust Amortization Period is
occurring (a "1990 Trust Amortization Term"), an amount not to exceed the lesser
of 1990 Trust Excess Servicing (after giving effect to the payments described
above) and the 1990 Trust Investor Loss Amount, each for the related Due Period,
will be withdrawn from the 1990 Trust Collections Account and deposited in the
1990 Trust Distribution Account or paid to the Seller as described below. The
amount of 1990 Trust Excess Servicing withdrawn from the 1990 Trust Collections
Account will be allocated among the classes of 1990 Trust Investor Certificates
pro rata according to Class Investor Interests as of the beginning of the Due
Period. If 1990 Trust Excess Servicing is less than the 1990 Trust Investor Loss
Amount, the amount of such deficiency will be allocated pro rata among the
classes of 1990 Trust Investor Certificates according to Class Investor
Interests as of the beginning of the Due Period and will be added to the related
Class Loss Amounts.
 
     The amount of 1990 Trust Excess Servicing allocable to each Non-Amortizing
Class will be paid to the Seller in exchange for an equal amount of the 1990
Trust Seller Interest, which will be reduced by the amount of any such payment.
If a deficiency remains, the 1990 Trust Seller Interest will be further reduced
by an amount equal to the lesser of the 1990 Trust Available Subordinated Amount
(after giving effect to any previous adjustments thereof) and the sum of the
Class Loss Amounts for the Non-Amortizing Classes. The 1990 Trust Available
Subordinated Amount will be reduced, and the Class Loss Amounts for the Non-
Amortizing Classes will be reduced pro rata according to Class Investor
Interests as of the beginning of the Due Period, by the amount by which the 1990
Trust Seller Interest is further reduced. The Class Loss Amounts remaining after
the adjustments described in this paragraph will be the respective "Class
Charged-Off Amounts" for the Non-Amortizing Classes, which will reduce the
related Class Invested Amounts and Class Investor Interests.
 
          "Class Invested Amount" means, with respect to any Distribution Period
     for any class of 1990 Trust Investor Certificates, the related Class
     Initial Invested Amount minus the sum of (a) the aggregate amount of
     payments of Certificate Principal paid to the holders of such class on or
     prior to the Distribution Date for the immediately preceding Distribution
     Period, (b) the aggregate amount of Class Charged-off Amounts not
     reimbursed on or prior to the Distribution Date for the immediately
     preceding Distribution Period and (c) the aggregate amount of Certificate
     Principal Account Losses on or prior to the Distribution Date for the
     immediately preceding Due Period allocable to the respective class of 1990
     Trust Investor Certificates.
 
          "Class Loss Amount" means, with respect to any Due Period for any
     class of 1990 Trust Investor Certificates, the sum of (a) such class's pro
     rata share of any Investor Loss Amount (after giving effect to the payment
     of 1990 Trust Excess Servicing), (b) the Class Charged-Off Amount (if any)
     for such class at the end of the prior Due Period (after giving effect to
     the payments and adjustments described herein), and (c) the Certificate
     Principal Account Losses (if any) allocable to such class for the Due
     Period. The Class Loss Amount for each class of 1990 Trust Investor
     Certificates shall initially be zero.
 
          "Class Initial Invested Amount" with respect to any outstanding class
     of 1990 Trust Investor Certificates will be set forth in the Prospectus
     Supplement.
 
     The amount of 1990 Trust Excess Servicing allocable to an Amortizing Class
will be paid from the 1990 Trust Distribution Account to such Amortizing Class.
If any Amortizing Class has a previously existing Class Loss Amount, an amount
equal to the lesser of the Class Loss Amount for such class and any remaining
1990 Trust Excess Servicing will be deposited in the 1990 Trust Distribution
Account for payment to the holders of 1990 Trust Investor Certificates of such
Amortizing Class, and the related Class Loss Amount will be reduced by the
amount of such payment. If two or more classes of 1990 Trust Investor
Certificates are amortizing simultaneously, such payment of 1990 Trust Excess
Servicing will be allocated pro rata among such Amortizing Classes based on
Class Investor Interests as of the beginning of the Due Period. If, after giving
 
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<PAGE>   104
 
effect to the payments described above, a Class Loss Amount remains with respect
to an Amortizing Class, payments first, from the positive amount, if any, by
which the sum of all Dealer Finance Charges, NITC Finance Charges and 1990 Trust
Investment Income exceeds Uncollectible Finance Charges, each for such Due
Period (the "1990 Trust Seller Interest Income") and second, during a 1990 Trust
Early Amortization Period through a withdrawal from the 1990 Trust Liquidity
Reserve Account, will be made to the 1990 Trust Distribution Account for the
benefit of such Amortizing Class to the extent of the 1990 Trust Available
Subordinated Amount, which will be reduced by the amount of such payment. Each
payment described in the preceding sentence will be allocated pro rata among all
Amortizing Classes that have Class Loss Amounts based on Class Investor
Interests as of the beginning of the Due Period and will be made only to the
extent of the remaining Class Loss Amounts for such classes and in no event in
excess of the 1990 Trust Available Subordinated Amount. If the aggregate amount
deposited in the 1990 Trust Distribution Account for the benefit of an
Amortizing Class pursuant to the provisions described in this paragraph is less
than the Class Loss Amount for such class, the 1990 Trust Seller Interest and
the Class Loss Amount each will be reduced by the amount of such remaining
deficiency to the extent of the 1990 Trust Available Subordinated Amount (after
giving effect to any previous adjustments thereof). The Class Loss Amount for an
Amortizing Class remaining after giving effect to the payments and adjustments
described in this paragraph is the Class Charged-Off Amount for such class for
the Due Period. The related Class Invested Amount and Class Investor Interest
will be increased or reduced, as the case may be, by an amount equal to the
difference between (a) the Class Charged-Off Amount for the immediately
preceding Due Period and (b) the Class Charged-Off Amount for the Due Period.
All payments to an Amortizing Class described in this paragraph will be treated
as payments of Certificate Principal and will therefore reduce the related Class
Invested Amount and Class Investor Interest by the amount of such payments.
 
     If the sum of the Class Loss Amounts for all outstanding classes of 1990
Trust Investor Certificates (after the application of 1990 Trust Excess
Servicing) exceeds the 1990 Trust Available Subordinated Amount (after giving
effect to all previous adjustments thereof), the 1990 Trust Available
Subordinated Amount will be allocated pro rata among the classes of 1990 Trust
Investor Certificates according to Class Investor Interests as of the beginning
of the Due Period and each class of 1990 Trust Investor Certificates will only
have available such class' pro rata share of the 1990 Trust Available
Subordinated Amount.
 
DISTRIBUTIONS
 
     General. During the term of the 1990 Trust, the amounts to be paid to the
holders of 1990 Trust Investor Certificates will be (unless otherwise specified)
withdrawn from the 1990 Trust Collections Account and deposited in the 1990
Trust Distribution Account on each Transfer Date. On each Distribution Date, the
1990 Trust Trustee will instruct the paying agent how to distribute the amounts
on deposit in the 1990 Trust Distribution Account to the holders of 1990 Trust
Investor Certificates. Payments made in respect of a Related 1990 Certificate
will be made by wire transfer to such account as the 1990 Trust Trustee shall
designate. The 1990 Trust Trustee is acting as the paying agent. The 1990 Trust
Trustee will be permitted to resign as paying agent upon 30 days prior written
notice and upon the appointment of a successor thereto. Any paying agent will
have the revocable power to withdraw funds from the 1990 Trust Distribution
Account for the purpose of making the distributions referred to above.
 
     Investor Certificateholders. On each Distribution Date during the 1990
Trust Non-Amortization Period, the Servicer will direct the 1990 Trust Trustee
to withdraw and cause the paying agent to pay funds from the 1990 Trust
Distribution Account to the holders of 1990 Trust Investor Certificates in an
amount equal to the 1990 Trust Investor Certificate Interest plus the 1990 Trust
Deficiency Amount as of the immediately preceding Distribution Date.
 
          "1990 Trust Investor Certificate Interest" means, with respect to any
     Distribution Period, an amount equal to interest at one-twelfth of the
     related Class Certificate Rate multiplied by the related Class Invested
     Amount for such Distribution Period for each class of 1990 Trust Investor
     Certificates outstanding during such Distribution Period.
 
                                       88
<PAGE>   105
 
     On each Transfer Date during a 1990 Trust Amortization Term, all amounts,
if any, on deposit in the Certificate Principal Account with respect to
Principal Collections during the related Due Period will be deposited in the
1990 Trust Distribution Account. The Servicer will then direct the 1990 Trust
Trustee to cause the paying agent to pay from funds in the Distribution Account
available therefor on each Distribution Date, first, to the holders of
certificates in any Amortizing Class, the amount of Principal Collections
allocable to such class and second, to the holders of 1990 Trust Investor
Certificates (including the Master Trust Trustee with respect to a Related 1990
Certificate), an amount equal to 1990 Trust Investor Certificate Interest plus
the 1990 Trust Deficiency Amount as of the immediately preceding Distribution
Date.
 
     Seller. The Seller will be entitled to receive any 1990 Trust Excess
Servicing which is not needed to reimburse holders of 1990 Trust Investor
Certificates for losses suffered during any Due Period and, to the extent that
the 1990 Trust Available Subordinated Amount has been previously reduced, 1990
Trust Excess Servicing will reinstate it accordingly (but in no event in excess
of the 1990 Trust Maximum Subordinated Amount). In addition, an amount equal to
the excess of all remaining Dealer Finance Charge Collections, Advances and NITC
Finance Charges during any Due Period Over the sum of all other payments
required to be made under the 1990 Trust Agreement during such Due Period will
be paid to the Seller.
 
NET PAYMENT
 
     All payments made pursuant to the 1990 Trust Agreement on any Transfer Date
on which NFC is the Servicer between the Servicer and the 1990 Trust Collections
Account may be aggregated for such Transfer Date such that NFC, acting as
Servicer, will only make one payment to such account in satisfaction of all
payments of the Servicer pursuant to the Agreement, reduced by the amount to be
received by NFC, acting as Servicer and as agent of the Seller, from the 1990
Trust Distribution Account on the related Distribution Date.
 
CLASS TERMINATION DATE
 
     All principal or interest with respect to any class of 1990 Trust Investor
Certificates will be due and payable no later than January 25, 2002 for the
Class A-2 Investor Certificates, January 25, 2003 for the Class A-3 Investor
Certificates, July 25, 2007 for the Class A-4 Investor Certificate and, with
respect to any Related 1990 Certificate, such date as is set forth in the
Prospectus Supplement (each, a "Class Termination Date"). If the Class Investor
Interest of any class of 1990 Trust Investor Certificates is greater than zero
on its Class Termination Date, the 1990 Trust Trustee will sell or cause to be
sold an amount of Dealer Notes up to 110% of the Class Investor Interest of such
class at the close of business on such date, and will pay the proceeds to all
holders of 1990 Trust Investor Certificates of such class pro rata in final
payment of all principal of and accrued interest on such 1990 Trust Investor
Certificates. Any proceeds of such sale in excess of such principal and interest
paid will be paid to the Seller. Upon the Class Termination Date with respect to
any Class Investor Certificates, final payment of all amounts allocable to any
1990 Trust Investor Certificates of such class will be made only upon
presentation and surrender of such 1990 Trust Investor Certificates at the
office or agency specified in the notice of final distribution to the holders of
1990 Trust Investor Certificates. The 1990 Trust Trustee will provide such
notice to registered holders of 1990 Trust Investor Certificates not later than
the Determination Date of the month of such final payment.
 
OPTIONAL REPURCHASE
 
     The Seller may repurchase, at its option, all outstanding classes of 1990
Trust Investor Certificates after the Class Investor Interest for each class of
1990 Trust Investor Certificates has been reduced to an amount equal or less
than ten percent of the class Initial Investor Interest for each such class. The
Seller may effect such repurchase by depositing into the Certificate Principal
Account an amount equal to the sum of each such Class Investor Interests plus
accrued and unpaid interest thereon at the applicable class Certificate Rates.
 
                                       89
<PAGE>   106
 
TERMINATION OF 1990 TRUST
 
     The 1990 Trust will terminate on the earlier to occur of (a) the day after
the day on which funds shall have been deposited in the 1990 Trust Distribution
Account sufficient to pay the Class Invested Amount plus interest accrued at the
applicable Class Certificate Rate through the last day of the Distribution
Period relating to such Distribution Date in full on each of the Class A-1, A-2,
and A-3 Investor Certificates and (b) a day which is 21 years less one day after
the death of the last survivor of all the officers and the lineal descendants of
every officer of the 1990 Trust Trustee who were living on the date of the 1990
Trust Agreement, except that if at any time any such rights, privileges, or
options shall be or become valid under applicable law for a period subsequent to
the 21st anniversary of the death of such last survivor (or, without limiting
the generality of the foregoing, if legislation shall become effective providing
for the validity or permitting the effective grant of such rights, privileges,
and options for a period in gross exceeding the period for which such rights,
privileges, and options are hereinabove stated to extend and be valid), then
such rights, privileges, or options shall not terminate as aforesaid but shall
extend to and continue in effect, but only if such not termination and extension
shall then be valid under applicable law, until on day prior to such time as the
same shall, under applicable law, cease to be valid.
 
     If on the Distribution Date in the month immediately preceding the month in
which the termination of the 1990 Trust occurs pursuant to clause (b) above, the
Class Invested Amount of any class of 1990 Trust Investor Certificates would be
greater than zero, the Servicer will sell within 30 days of such Distribution
Date all of the Dealer Notes owned by the 1990 Trust. The proceeds of such sale
will be treated as 1990 Trust Collections and will be allocated in accordance
with the 1990 Trust Agreement.
 
                     DESCRIPTION OF THE PURCHASE AGREEMENTS
 
     The Dealer Notes are transferred to the Active Trust by the Seller and are
acquired by the Seller from NFC (a) prior to the 1990 Trust Termination Date,
pursuant to the Purchase Agreement dated as of December 1, 1990 between NFC and
NFSC (the "1990 Trust Purchase Agreement") and (b) after the 1990 Trust
Termination Date, pursuant to the Purchase Agreement dated as of June 8, 1995
between NFC and NFSC and to be effective on the 1990 Trust Termination Date (the
"Master Trust Purchase Agreement," and together with the 1990 Trust Purchase
Agreement, the "Purchase Agreements") (the operative Purchase Agreement being
the "Active Purchase Agreement"). The following summary describes certain terms
of the Purchase Agreements and is qualified in its entirety by reference to the
Purchase Agreements.
 
PRIOR SALES OR TRANSFER OF DEALER NOTES
 
     Pursuant to the 1990 Trust Purchase Agreement, NFC has, since December 27,
1990, on each business day sold or transferred to the Seller all of its right,
title and interest in and to all of the Eligible Dealer Notes (other than Dealer
Notes contributed by NFC to NFSC (the "Contributed Dealer Notes")) owned by it
on such day, all monies due (including accrued finance charges) or to become due
with respect thereto and all proceeds (including Insurance Proceeds) thereon,
and the interest of NFC in the security interests in the Financed Vehicles
related to such Dealer Notes. The purchase price paid by the Seller for such
Dealer Notes was the principal amount thereof plus accrued finance charges
thereon. Such purchase price was paid by the Seller either in cash or by means
of a loan under the Master Revolving Credit Agreement (a "Master Loan").
Pursuant to the Contribution Agreement, on December 27, 1990, NFC transferred to
the Seller as a one-time contribution to capital the Contributed Dealer Notes,
all monies due (including accrued finance charges) or to become due with respect
thereto and all proceeds (including Insurance Proceeds) thereon, and the
interest of NFC in the security interests in the Financed Vehicles related to
such Dealer Notes.
 
     In connection with the sales or transfers of the Dealer Notes to the
Seller, NFC indicates in its computer files that the Dealer Notes have been sold
or transferred to the Seller, and that such Dealer Notes have been transferred
by the Seller to the 1990 Trust. In addition, NFC provides to the Seller a
computer file or a microfiche list containing a true and complete list of all
such Dealer Notes, identified by Dealer Note number. The records and agreements
relating to the Dealer Notes have not been and will not be segregated by NFC
from other documents and agreements relating to other wholesale notes and have
not been and will not be
 
                                       90
<PAGE>   107
 
stamped or marked to reflect the sale or transfer of the Dealer Notes to the
Seller, but the computer records of NFC are marked to evidence such sale or
transfer. NFC has filed Uniform Commercial Code financing statements with
respect to the Dealer Notes meeting the requirements of Illinois, New York and
Delaware state law. See "Risk Factors -- Delays or Reductions in Payments Due to
Insolvency" and "Certain Matters Relating to the Dealer Notes."
 
ONGOING DAILY SALES OF DEALER NOTES
 
     The Purchase Agreements provide that on each business day during the term
of the Active Trust (except upon the occurrence of a bankruptcy event involving
the Seller, NFC , NITC or NIC), NFC will continue to sell to the Seller (each
such transaction, a "Daily Note Sale") all Eligible Dealer Notes existing and
owned by NFC as of such business day, all monies due or to become due with
respect thereto and all proceeds (including Insurance Proceeds) thereon, and the
interest of NFC in the security interests in the Financed Vehicles related to
such Dealer Notes. The Active Purchase Agreement permits NFC to adjust the
principal amount of Dealer Notes that are considered Eligible Dealer Notes (see
"Description of the Offered Certificates -- Eligible Dealer Notes").
 
     The purchase price to be paid by the Seller for such Dealer Notes will
equal the principal amount of such Dealer Notes plus accrued finance charges
thereon, and will be paid to NFC in the form of cash or a Master Loan under the
Master Revolving Credit Agreement. However, if the amount specified above does
not, in the opinion of the Seller, approximate the fair market value of the
Dealer Notes being purchased, then such Daily Note Sale shall be on terms
between NFC and the Seller that reasonably approximate such fair market value.
 
     In connection with each Daily Note Sale, NFC will update its computer files
to indicate that Dealer Notes have been sold to the Seller pursuant to a Daily
Note Sale and deliver to the Seller a computer file, hard copy or microfiche
list containing a true and complete list of all Dealer Notes sold to the Seller
pursuant to such Daily Note Sale, identified by Dealer Note number.
 
REPRESENTATIONS AND WARRANTIES
 
     NFC has made certain representations and warranties to the Seller to the
effect that, among other things, (a) it is duly incorporated and in good
standing and that it has the authority to consummate the transactions
contemplated by the Purchase Agreements, (b) each of the Purchase Agreements is
the valid, binding and enforceable obligation of NFC, (c) that all information
furnished to the Seller is accurate in all material respects and (d) that there
are no proceedings pending or threatened against NFC that would have a material
adverse effect on the performance by NFC of its obligations under the Purchase
Agreements.
 
REPURCHASE OBLIGATIONS
 
     NFC has agreed in the Active Purchase Agreement that if the Seller is
required to repurchase the 1990 Trust Investor Certificates issued by the 1990
Trust or the Certificateholders' Interest pursuant to the Applicable Agreement,
NFC will in turn repurchase such certificates or the Certificateholders'
Interest from the Seller. The purchase price paid by NFC will be equal to the
purchase price required to be paid by the Seller pursuant to the Applicable
Agreement, and shall be paid prior to or concurrently with any corresponding
payments required to be made by the Seller pursuant to the Applicable Agreement.
 
     NFC also has agreed in the Active Purchase Agreement that if (a) any Dealer
Note has not been sold to the Seller free and clear of any encumbrances or is
not in compliance with all legal requirements applicable to NFC, (b) NFC has not
obtained all necessary governmental consents or approvals required to be
obtained in connection with the sale of such Dealer Note to the Seller or (c)
the Seller has otherwise been required to repurchase such Dealer Note pursuant
to the Applicable Agreement, then NFC will repurchase such Dealer Note from the
Seller. The purchase price to be paid for such Dealer Note will equal the
principal amount of such Dealer Note plus accrued finance charges thereon. NFC
must pay for such Dealer Note no later than the date upon which the Seller is
obligated to make a corresponding payment to the Active Trust pursuant to the
Applicable Agreement.
 
                                       91
<PAGE>   108
 
CERTAIN COVENANTS
 
     In the Active Purchase Agreement, NFC has covenanted that it will perform
its obligations under the agreements relating to the Dealer Notes in conformity
with the Credit Guidelines. NFC has further covenanted that, except for the sale
and conveyances under the Active Purchase Agreement or the Applicable Agreement,
NFC will not sell, pledge, assign or transfer any interest in the Dealer Notes
to any other person. NFC has also covenanted that it will file all necessary
documents covering the Seller's right, title and interest in the Dealer Notes.
 
TERMINATION
 
     The then Active Purchase Agreement will terminate immediately after the
Master Trust terminates.
 
                           FEDERAL INCOME TAX MATTERS
 
GENERAL
 
     The following discussion of anticipated material generally applicable
federal income tax consequences of the purchase, ownership and disposition of
Offered Certificates is based on the advice of Kirkland & Ellis ("Tax Counsel")
as special tax counsel to the Seller and NFC. The discussion is based upon
current provisions of the Internal Revenue Code of 1986, as amended (the
"Code"), existing and proposed Treasury Regulations thereunder, current
administrative rulings, judicial decisions and other applicable authorities.
There can be no assurance that the Internal Revenue Service (the "IRS") will not
challenge the conclusions reached herein, and no ruling from the IRS has been or
will be sought. Furthermore, legislative, judicial or administrative changes may
occur, perhaps with retroactive effect, that could affect the accuracy of the
statements and conclusions set forth herein as well as the tax consequences to
Offered Certificateholders.
 
     This discussion does not purport to deal with all aspects of federal income
taxation that may be relevant to Offered Certificateholders in light of their
personal investment circumstances, nor, except for certain limited discussions
of particular topics, to certain types of holders subject to special treatment
under the federal income tax laws (e.g., financial institutions, broker-dealers,
life insurance companies, tax-exempt organizations, nonresident alien
individuals and foreign corporations). This information is directed to
prospective purchasers of Offered Certificates who purchase Offered Certificates
in the primary Offering, who are citizens or residents of the United States,
including domestic corporations and partnerships, and who hold the Offered
Certificates as "capital assets" within the meaning of Section 1221 of the Code.
THEREFORE, PROSPECTIVE INVESTORS SHOULD CONSULT WITH THEIR OWN TAX ADVISORS AS
TO THE FEDERAL, STATE, LOCAL, FOREIGN AND ANY OTHER TAX CONSEQUENCES TO THEM OF
THE PURCHASE, OWNERSHIP AND DISPOSITION OF INVESTOR CERTIFICATES.
 
CHARACTERIZATION OF THE OFFERED CERTIFICATES AS INDEBTEDNESS
 
     The Seller, NFC and the Offered Certificateholders express in the Pooling
and Servicing Agreement and on the Offered Certificates their intent that, for
federal, state and local income and franchise tax purposes, the Offered
Certificates will be indebtedness secured by the Related 1990 Certificate prior
to the 1990 Trust Termination Date and by the Dealer Notes after the 1990 Trust
Termination Date. The Seller and each Offered Certificateholder, by acquiring an
interest in an Offered Certificate, agree to treat the Offered Certificates as
indebtedness for federal, state and local income and franchise tax purposes.
However, because different criteria are applied in determining the non-tax
accounting characterization of the transaction, the Seller will treat the
transaction for financial accounting purposes as a sale of an ownership interest
in the Dealer Notes and not as the creation of a debt obligation.
 
     Applying current law to the facts of the transaction as set forth in the
Pooling and Servicing Agreement and other relevant documents, Tax Counsel has
advised the Seller and NFC that, in its opinion, although the matter is not free
from doubt, the Offered Certificates would be treated as indebtedness for
federal income tax purposes for the reasons set forth below.
 
                                       92
<PAGE>   109
 
     Generally, the federal income tax characterization of a transaction depends
upon its economic substance, and the substance of the issuance of Offered
Certificates is consistent with treating the Offered Certificates as debt for
federal income tax purposes. Further, as mentioned above, the parties to the
transaction have agreed to treat the Offered Certificates as debt obligations
for tax purposes. Although certain judicial precedents hold that in appropriate
circumstances a taxpayer must treat a transaction in accordance with the form
chosen by such taxpayer, regardless of the substance of the transaction, Tax
Counsel has advised that, in its opinion, those precedents are inapplicable
here.
 
     Although the IRS and the courts have set forth several factors to be taken
into account in determining whether the substance of a transaction is a sale of
property or a loan secured by the transferred property, the primary factors
utilized in making this determination are whether the transferee has assumed the
risk of loss or other economic burdens relating to the property and whether the
transferee has obtained the opportunity for gain or other benefits of the
ownership thereof. If such economic benefits and burdens associated with
ownership of property remain with the transferor and have not passed to the
transferee, the transaction is characterized as a financing rather than a sale.
 
     Under the Pooling and Servicing Agreement, the Offered Certificateholders
are entitled (a) to receive Monthly Interest, and (b) subject to certain
reductions in the event of principal losses on Dealer Notes after all credit
enhancement has been exhausted, to the return of their principal investment.
Although Offered Certificateholders may benefit because floating rate
instruments such as the Dealer Notes benefit in a rising market over fixed rate
instruments, this benefit exists with many debt instruments and is entirely
unrelated to the performance of the Dealer Notes. Thus, no significant amount of
potential gain inherent in the Dealer Notes has been transferred to Offered
Certificateholders.
 
     Similarly, the Offered Certificateholders do not bear the risk of loss
which is associated with direct ownership of the Dealer Notes. If the Offered
Certificateholders purchased Dealer Notes directly, they would incur losses if
any Dealers defaulted. The Offered Certificates, by contrast, are substantially
insulated from any such loss experience because of credit support mechanisms
provided in the Agreements. Any potential losses are expected to be satisfied
from, and to the extent of: credit enhancement provided prior to the 1990 Trust
Termination Date under the 1990 Trust in respect of the Related 1990
Certificate, the Interest Rate Swap and, under certain circumstances, the
Negative Carry Subordinated Amount and, after the 1990 Trust Termination Date,
and to the extent provided herein, Available Seller's Collections. In part
because of the availability of these sources to satisfy any shortfalls in Dealer
payments, the Rating Agencies have given the Offered Certificates their highest
credit rating. This superior rating strongly indicates that the risk of loss to
the Offered Certificateholders is anticipated to be remote.
 
     As Offered Certificateholders do not share significantly in either the
benefits or burdens associated with direct ownership of the Dealer Notes, the
arrangement created by the Pooling and Servicing Agreement is properly viewed
for federal income tax purposes as a financing, rather than a sale, of the
Dealer Notes. Therefore, the Offered Certificates would be treated, in economic
substance, as indebtedness for which the Related 1990 Certificate or the Dealer
Notes, as the case may be, and other assets held in the Master Trust serve as
collateral.
 
     The above discussion is only a summary of certain aspects of the analysis
and conclusions contained in the tax opinion filed as an exhibit to the
Registration Statement of which this Prospectus is a part. The ensuing
discussion of federal income tax consequences assumes that the Offered
Certificates are treated as debt for federal income tax purposes.
 
STATED INTEREST ON OFFERED CERTIFICATES
 
     Interest paid on the Offered Certificates would be taxable as ordinary
income for federal income tax purposes when received or accrued by Offered
Certificateholders in accordance with their respective methods of accounting. As
discussed below, the Offered Certificates will be subject to the usual rules
applicable to bond premium and market discount. Interest received on the Offered
Certificates may also constitute "investment income" for purposes of certain
limitations of the Code concerning the deductibility of investment interest
expense.
 
                                       93
<PAGE>   110
 
ORIGINAL ISSUE DISCOUNT
 
     The Offered Certificates are expected to be issued at par and, therefore,
it is not anticipated that the Offered Certificates will bear any original issue
discount ("OID"). However, because the Offered Certificates do not provide for
the payment of late penalty interest on default, the Offered Certificates may be
treated as issued with OID. In general, OID is the excess of the stated
redemption price at maturity of a debt instrument over its issue price, unless
such excess falls within a statutorily defined de minimis exception.
Nevertheless, the holder of an Offered Certificate that has de minimis OID is
required to include such de minimis OID in income as principal payments are made
in proportion to the ratio each such principal payment bears to the stated
principal amount of such Offered Certificate. Any amount of de minimis OID
includible in income under the preceding sentence is treated as gain recognized
on retirement of the debt instrument.
 
     The OID provisions of the Code are complex, and unresolved issues abound in
the area even though final Regulations have been adopted. If, in spite of
expectations, any Offered Certificates are in fact issued with OID, the
following rules would generally apply; however, Offered Certificateholders are
urged to consult their own tax advisors with respect to the impact on them of
the matters discussed below.
 
     Offered Certificateholders will generally be required to include OID in
income in advance of receipt of all or a portion of the cash representing such
OID, regardless of whether they otherwise report taxable income on the cash or
the accrual method. A holder of a debt instrument issued with OID must recognize
as ordinary income the amount of OID as it accrues, in accordance with a
constant yield method. The amount of OID to be included in income in any taxable
year is determined by allocating to each day during such year on which the
holder holds the instrument a pro rata portion of the OID attributable to the
"accrual period" which includes such day. Under applicable Treasury Regulations,
the Offered Certificates have a monthly accrual period.
 
     In addition, because of the payment terms of the Offered Certificates, the
IRS could contend that interest thereon should be treated as part of the stated
redemption price at maturity. In such case, an Offered Certificateholder would
be required to recognize all interest as OID under the rules described above
(but would not recognize ordinary income upon receipt of actual payments of cash
denominated as interest). Thus, each cash payment would be treated as an amount
already included in income (to the extent OID has accrued as of the date of the
interest payment and is not allocated to prior payments), or as a repayment of
principal.
 
     Further, under Section 1272(a)(6) of the Code, special rules apply to any
debt instrument on which payments may be accelerated due to prepayments of other
obligations securing those debt instruments. When these rules apply, the
computation of OID must be determined by taking into account both the prepayment
assumptions used in pricing the debt instrument and the actual prepayment
experience. As a result, the amount of OID on such debt instrument which will
accrue in any given accrual period may either increase or decrease, depending
upon the actual prepayment rate.
 
     U.S. holders may generally elect to include in income all interest
(including stated interest, acquisition discount, OID, de minimis OID, market
discount, de minimis market discount, and unstated interest, as adjusted by any
amortizable bond premium or acquisition premium) that accrues on a debt
instrument by using the constant yield method applicable to OID, subject to
certain limitations and exceptions. If such election is made, amounts of de
minimis OID and de minimis market discount which otherwise would have been
treated as gain upon retirement or disposition of an Offered Certificate are
instead treated as ordinary interest income.
 
     Certain information must be furnished annually on the amount of OID, if
any, accruing during the year (as well as interest paid during that year) to the
IRS and to certain classes of Offered Certificateholders. Since information with
respect to OID is based upon the adjusted issue price of Offered Certificates,
any subsequent holders who purchase Offered Certificates for an amount in excess
of the adjusted issue price will be required to determine for themselves the
amount of OID (if any) that they are required to report.
 
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<PAGE>   111
 
TREATMENT OF MARKET DISCOUNT BY SUBSEQUENT PURCHASERS
 
     The resale of an Offered Certificate may be affected by the market discount
provisions of the Code. Generally, if a holder of a debt instrument acquires it
at a market discount (i.e., at a price below its stated redemption price at
maturity or its adjusted issue price if it was issued with OID, subject to a
statutorily defined de minimis exception) and thereafter realizes gain upon a
disposition of the debt instrument (including a gift), the lesser of (a) such
gain (or appreciation, in the case of a gift) or (b) the portion of the market
discount that accrued while the debt instrument was held by such holder, will be
treated as ordinary interest income at the time of the disposition. In addition,
a holder who acquires a debt instrument at a market discount may be required to
defer a portion of any interest expense that otherwise may be deductible on any
indebtedness incurred or maintained to purchase or carry the debt instrument
until the holder disposes of the debt instrument in a taxable transaction.
 
     Partial principal payments on the Offered Certificates will be made monthly
under certain circumstances. A holder who acquires an Offered Certificate at a
market discount will be required to treat as ordinary interest income the
portion of any principal payment attributable to accrued market discount on such
Offered Certificate.
 
     A holder who acquires an Offered Certificate at a market discount may elect
to include market discount in income as the discount accrues on a constant
interest rate basis. The current inclusion election, once made, applies to all
market discount obligations acquired on or after the first day of the first
taxable year to which the election applies, and may not be revoked without the
consent of the IRS. If such election is made, the rules described in the
preceding two paragraphs (regarding recognition of ordinary income in certain
circumstances and the deferral of interest deductions) will not apply.
 
TREATMENT OF ACQUISITION PREMIUM AND AMORTIZABLE BOND PREMIUM
 
     A subsequent holder who pays an "acquisition premium" for an Offered
Certificate may be entitled to reduce (but not below zero) any amount of OID
otherwise includible in such holder's income. "Acquisition premium" is any
amount paid by a subsequent holder for an Offered Certificate in excess of its
adjusted issue price at the time of its acquisition, but less than or equal to
the sum of all amounts payable on the debt instrument after the purchase date
other than payments of qualified stated interest.
 
     A holder of an Offered Certificate who acquires such instrument (including
at its original issuance) at a price in excess of its stated redemption price at
maturity, will be exempt from the OID rules described above. Moreover, such
holder may be able to elect to amortize the excess under a constant interest
rate method as "bond premium" pursuant to Section 171 of the Code. The
legislative history to the Tax Reform Act of 1986 indicates that amortization of
bond premium on an obligation providing for partial principal payments before
maturity should be governed by rules such as those provided for the accrual of
market discount (as described above).
 
     A holder electing to amortize bond premium must reduce his tax basis in the
obligation by the aggregate amount of deductions allowable for such premium. If
a debt instrument purchased at a premium is redeemed in full prior to maturity,
a purchaser who elects to deduct bond premium should be entitled to a deduction
for any remaining unamortized bond premium in the taxable year of redemption.
Under present law, amortizable bond premium generally offsets interest income on
the obligation rather than constituting a separate interest deduction item
subject to the investment interest limitations of the Code.
 
     The IRS has issued proposed regulations with respect to amortizing bond
premium which bring the amortization rules more in line with the final OID
regulations. If these proposed regulations become final in their existing form,
an election under the finalized regulations will apply to bonds held on or after
the first day of the taxable year in which the election was made.
 
SALES OF INVESTOR CERTIFICATES
 
     In general, a Certificateholder will recognize gain or loss upon the sale,
exchange, redemption or other taxable disposition of an Offered Certificate
measured by the difference between (a) the amount of cash and
 
                                       95
<PAGE>   112
 
the fair market value of any property received (other than amounts attributable
to, and taxable as, accrued stated interest) and (b) the Certificateholder's tax
basis in the Offered Certificate (as increased by any OID or market discount
included in income and as decreased by any deduction for amortizable bond
premium previously allowed and by the amount of principal payments previously
received thereon). Subject to the OID and market discount rules discussed above,
any such gain or loss generally will be capital gain or loss if such certificate
was held as a capital asset, and generally would be long-term capital gain or
loss if such Offered Certificate was held for more than one year.
 
     Under present law, the federal income tax rates for individuals applicable
to long-term capital gains (28%) are less than those applicable to ordinary
income (maximum 39.6%). However, these rates could be changed by subsequent
legislation.
 
FOREIGN HOLDERS
 
     This section generally discusses the United States federal income tax
consequences of the ownership and disposition of Offered Certificates by a
holder who is not a "United States person" (a "foreign holder"). The term
"United States person" means (a) a citizen or resident of the United States, (b)
a corporation or partnership created or organized in the United States or under
the laws of the United States or of any State, and (c) an estate or trust the
income of which is subject to United States federal income taxation regardless
of its source. The term "foreign person" means a person who is not a "United
States person." Some foreign holders (including certain residents of certain
United States possessions or territories) may be subject to special rules not
discussed herein.
 
     Payments of interest (including OID, if any) made to a foreign holder which
are not effectively connected with such holder's conduct of a trade or business
within the United States generally will not be subject to United States federal
income tax or withholding tax if (a) the foreign holder is not a "10 percent
shareholder" or a "controlled foreign corporation" with respect to which the
Seller or NFC is a "related person" within the meaning of the Code and (b) the
beneficial owner (and, if relevant, a financial institution on the beneficial
owner's behalf) provides an appropriate statement, signed under penalties of
perjury, certifying that the beneficial owner of the Offered Certificate is a
foreign person and providing the beneficial owner's name and address. The
statement generally must be provided in the year a payment occurs or in either
of the two preceding years.
 
     Any capital gain realized on the sale, exchange, redemption, retirement or
other taxable disposition of an Offered Certificate by a foreign holder
generally will not be subject to United States federal income tax or withholding
tax, provided that (a) the gain is not effectively connected with the foreign
holder's conduct of a trade or business in the United States and (b) in the case
of an individual foreign holder, (i) he is not present in the United States for
183 days or more in the taxable year of such disposition, or (ii)(A) he does not
have a "tax home" in the United States and (B) the gain is not attributable to
an office or other fixed place of business he maintained in the United States.
 
     If the interest, gain or income on an Offered Certificate held by a foreign
holder is effectively connected with such holder's conduct of a trade or
business in the United States, then the foreign holder (albeit exempt from the
withholding tax if he provides an appropriate statement) generally will be
subject to United States federal income tax on such interest, gain or income at
regular federal income tax rates. In addition, if such holder is a foreign
corporation, it may be subject to a branch profits tax equal to 30% of its
"effectively connected earnings and profits" within the meaning of the Code for
the taxable year, as adjusted for certain items, unless it qualifies for a lower
rate under an applicable tax treaty.
 
     Provided that an Offered Certificate is treated as debt, it will be
excludable, for United States federal estate tax purposes, from the estate of an
individual who, at the time of his death, was a foreign holder if, immediately
before his death, (a) he was not a "10 percent shareholder" of the Seller or NFC
within the meaning of the Code, and (b) such Offered Certificate was not
effectively connected with his conduct of a United States trade or business.
 
                                       96
<PAGE>   113
 
     See also the discussion below of potential consequences to foreign holders
if the IRS were to contend successfully that the Offered Certificates do not
constitute indebtedness for federal income tax purposes.
 
     The IRS has issued proposed regulations which may impose additional
reporting requirements on certain Foreign Holders.
 
     THE FOREGOING DESCRIPTION OF THE POTENTIAL UNITED STATES FEDERAL TAX
CONSEQUENCES TO FOREIGN HOLDERS IS NECESSARILY INCOMPLETE. FOREIGN HOLDERS ARE
STRONGLY URGED TO CONSULT THEIR OWN TAX ADVISORS WITH RESPECT TO THE APPLICATION
TO THEM OF THE FOREGOING MATTERS.
 
BACKUP WITHHOLDING
 
     A 31% "backup" withholding tax and information reporting requirements apply
to certain payments of principal and interest (and OID, if any) on an
obligation, and to proceeds of certain sales of an obligation before maturity,
to certain nonexempt Offered Certificateholders who are United States persons,
if such holders fail to provide correct taxpayer identification numbers and
other information. The Seller, its paying agent, or a broker, as the case may
be, will be required to withhold from any payment that is subject to backup
withholding a tax equal to 31% of such payment unless the Offered
Certificateholder furnishes its taxpayer identification number in the manner
prescribed in applicable Treasury Regulations, and unless certain other
conditions are met.
 
     In the case of payments of principal and interest (and OID, if any) on
Offered Certificates by the Seller or paying agents of the Seller to foreign
holders, temporary Treasury regulations provide that backup withholding and
information reporting will not apply if the holder has provided the required
certification of its status as a foreign person under penalties of perjury, or
has otherwise established an exemption (provided that neither the Seller nor its
paying agent has actual knowledge that the holder is a United States person or
that the conditions of any other exemption are not in fact satisfied). Special
rules apply if payment is collected by a foreign office of a custodian, nominee
or other agent acting on behalf of an owner of an Offered Certificate. Payments
of the proceeds of a sale of Offered Certificates to or through a broker are
also subject to special rules.
 
     Any amounts withheld under the backup withholding rules will be allowed as
a refund or a credit against an Offered Certificateholder's United States
federal income tax, provided that the required information is furnished to the
IRS.
 
OTHER POSSIBLE CHARACTERIZATIONS OF CERTIFICATES
 
     As noted above, Tax Counsel has opined that the Offered Certificates would
be treated as indebtedness for federal income tax purposes, and the foregoing
discussion of tax consequences assumes that this will be the case. There can be
no assurance that the IRS or the courts will agree with Tax Counsel's opinion.
If a court were to determine that the Agreement does not create a debt
obligation for Federal income tax purposes, the arrangement created by the
Agreement could be classified for such purposes as, alternatively, a partnership
or a publicly traded partnership treated as a corporation. The tax consequences
to Offered Certificateholders of each such possible recharacterization are
described briefly below. Investors should consult their own tax advisors as to
the possible tax consequences to them of potential alternative treatments.
 
     If the arrangement created by the Agreement were characterized as a
partnership among the Seller and the Offered Certificateholders, the partnership
in all likelihood would be treated as a "publicly traded partnership." If such
partnership were nevertheless not taxable as a corporation (for example, because
its income is interest not derived in the conduct of a financial business), such
partnership would not be subject to Federal income tax. Rather, each item of
income, gain, loss, deduction and credit generated through the ownership of the
Dealer Notes by such a partnership would be passed through to the Seller and the
Offered Certificateholders as partners in such a partnership according to their
respective interests therein. The amount and timing of income reportable by the
Offered Certificateholders as partners could differ materially from the income
reportable by the Offered Certificateholders if the Offered Certificates are
characterized as debt.
 
                                       97
<PAGE>   114
 
     In addition, if such a partnership were considered to be engaged in a trade
or business within the United States, each foreign holder would be required to
file a United States income tax return and pay tax on its share of partnership
income at regular rates (including the branch profits tax in the case of a
foreign corporation). The partnership itself would be subject to a withholding
tax on distributions to (or, at its election, income allocable to) foreign
holders, and each foreign holder would be credited with his share of the
withholding tax paid by the partnership. Further, even if the partnership were
not considered to be engaged in a trade or business within the United States, it
appears that partnership withholding would be required in the case of any
foreign holder who is engaged in a trade or business within the United States to
which the Offered Certificate income is effectively connected.
 
     Alternatively, if such a partnership is not considered to be engaged in a
trade or business within the United States and if income with respect to an
Offered Certificate is not otherwise effectively connected with a foreign
holder's conduct of a trade or business within the United States, the holder
generally would be subject to United States federal withholding tax at a rate of
30% (unless reduced by an applicable treaty) on his distributive share of the
partnership's interest income.
 
     If the arrangement created by the Agreement were taxable as a corporation
because of being a publicly traded partnership, it would be subject to federal
income taxes (and possibly state income taxes -- see "Certain State Matters") at
corporate tax rates on its taxable income generated by ownership of the Dealer
Notes. Such a tax could result in reduced distributions to Offered
Certificateholders. In addition, if the Offered Certificates were treated as
interests in a publicly traded partnership taxable as a corporation, all or a
portion of any such distributions would, to the extent of the current and
accumulated earnings and profits of such corporation, be treated as dividend
income to the Offered Certificateholders. Such dividends, if payable to
corporate holders, would be eligible for the dividends received deduction. In
the case of foreign holders, such dividend income would generally be subject to
a 30% withholding tax unless the rate were reduced by an applicable treaty.
 
     If the arrangement created by the Agreement were treated as a partnership
(but not as a publicly traded partnership), any income allocated to a
Certificateholder that is a tax-exempt entity likely would constitute "unrelated
business taxable income."
 
     In the opinion of Tax Counsel, because the Offered Certificates would be
characterized as debt, no attempt will be made to comply with any IRS reporting
or tax payment requirements which might be applicable if the transaction were
treated as creating a partnership or a corporation.
 
                           CERTAIN STATE TAX MATTERS
 
GENERAL
 
     Offered Certificateholders may also become liable for state income taxes in
one or more taxing jurisdictions. State income tax consequences (including local
income tax consequences) to each Offered Certificateholder depend upon the
provisions of the state tax laws to which the Investor Certificateholder is
subject. Because each state's income tax laws are different, it is impossible to
predict the income tax consequences to the Offered Certificateholders in all of
the state taxing jurisdictions in which they are already subject to tax.
 
ILLINOIS AND NEW YORK
 
     Most of the activities to be undertaken by the Servicer and the Trustee
will take place in Illinois and New York. If the Offered Certificates are
characterized as indebtedness for federal income tax purposes, in the opinion of
Tax Counsel, as to Illinois and New York state tax consequences, although the
matter is not free from doubt, this treatment would also apply for purposes of
the Illinois income tax, and the New York income and corporate franchise taxes.
If the Offered Certificates are characterized as debt in the named states, the
Offered Certificateholders not otherwise subject to taxation in those states
will not, although the matter is not free from doubt, become subject to such
taxes solely because of their ownership of Offered Certificates. Offered
Certificateholders already subject to taxation in those states, however, could
be required to pay tax on
 
                                       98
<PAGE>   115
 
or measured by interest income (including OID, if any) generated by, and on gain
from the disposition of, the Offered Certificates.
 
     The above discussion of state tax consequences assumes the Offered
Certificates will be characterized as debt for federal income tax purposes.
However, if the arrangement created by the Agreement were treated as a
partnership or as a publicly traded partnership taxable as a corporation, the
state income tax consequences to the Offered Certificateholders could be
materially different.
 
     If the arrangement created by the Agreement were treated as a partnership
for Illinois and New York state tax purposes, it is possible that each state
could view the partnership as doing business in its state and, unless Offered
Certificateholders were treated as holding debt of such partnership, could treat
each Offered Certificateholder as deriving income from activities in the state.
As a result, the state might, under applicable income apportionment and sourcing
rules, treat some part of the partnership's income as allocable to such state
and then tax an Offered Certificateholder on its share of such income. Moreover,
classification of the arrangement as a "partnership" might cause an Offered
Certificateholder not otherwise subject to tax in these states to pay state tax
on income beyond that derived from the Offered Certificates. In addition, such
partnership could be subject to the Illinois personal property replacement tax,
which taxes would reduce the amounts available for distribution to Offered
Certificateholders.
 
     If the Offered Certificateholders were treated as owning interests in a
corporation for state tax purposes, then the hypothetical corporation could be
subject to Illinois income and New York income and corporate franchise taxes.
Such taxes could result in reduced distributions to Offered Certificateholders.
An Offered Certificateholder not otherwise subject to Illinois or New York state
tax law should not become subject to such tax laws solely as a result of its
ownership of Offered Certificates.
 
     There can be no assurance that no other state will claim that activities
with respect to the Agreement have taken place in such state and therefore
subject Offered Certificateholders to taxation in such state. If any state
taxing authority were to assert such a claim successfully, the treatment of the
Offered Certificates for purposes of such state's income tax laws would be
determined thereunder, and there can be no assurance that the Offered
Certificates would be treated as indebtedness for purposes of taxation in that
state.
 
     The foregoing description of the potential state tax consequences is
necessarily incomplete. Offered Certificateholders are urged to consult their
own tax advisors with respect to the applicability of state and local income and
franchise taxes to their investment in the Offered Certificates.
 
                     CERTAIN MATTERS RELATING TO BANKRUPTCY
 
     The Seller's certificate of incorporation includes a provision that, under
certain circumstances, requires the Seller to designate two directors who
qualify under the certificate of incorporation as "Independent Directors." The
Seller's certificate of incorporation provides that the Seller will not file a
voluntary petition for relief under the Bankruptcy Code without the unanimous
affirmative vote of its directors. Pursuant to the Pooling and Servicing
Agreement, the Servicer, the Master Trust Trustee and each Investor
Certificateholder covenant that it will not institute against the Seller or the
Master Trust any bankruptcy, reorganization or other proceedings under any
federal or state bankruptcy law until one year and one day after all
Certificateholders have been paid in full.
 
     The transfers of Dealer Notes from NITC to NFC, from NFC to the Seller and
from the Seller to the Active Trust have been structured as, and will be treated
by the parties as, sales. In 1993, the U.S. Court of Appeals for the Tenth
Circuit ruled that accounts sold prior to a bankruptcy should be treated as
property of the bankruptcy estate. In the event that NITC, NFC or the Seller
were to become a debtor in a bankruptcy case and a creditor or trustee in
bankruptcy of such debtor or such debtor itself were to apply this analysis or
otherwise take the position that the transfer of the Dealer Notes from such
debtor to the Seller or the Active Trust, as the case may be, should be
recharacterized as a pledge of such Dealer Notes to secure a borrowing by such
debtor, then delays in receipt of Collections on such Dealer Notes to the Active
Trust and payments on the Offered Certificates could result or, should the court
rule in favor of any creditor, trustee in bankruptcy or debtor, reductions in
the amount of such payments could result.
 
                                       99
<PAGE>   116
 
     In addition, if NFC or the Seller were to become a debtor in a bankruptcy
case and a creditor or trustee in bankruptcy of such debtor or such debtor
itself were to request a court to order that NFC should be substantively
consolidated with the Seller, delays in payments on the Offered Certificates
could result. Should the bankruptcy court rule in favor of any such creditor,
trustee in bankruptcy or debtor, reductions in the amount of such payments could
result.
 
     If NIC, NITC, NFC or the Seller were to become a debtor in a bankruptcy
case, an Early Amortization Event would occur. In such event, all Series
Allocable Principal Collections would be applied to principal payments on the
Offered Certificates and Dealer Notes thereafter would no longer be sold to the
Seller and transferred to the Active Trust. The occurrence of certain events of
bankruptcy, insolvency or receivership with respect to the Servicer will also
result in a Master Trust Servicer Termination Event. A trustee in bankruptcy of
the Servicer (including the Servicer as debtor in possession) may have the power
to prevent either the Active Trustee or the holders of Certificates issued by
the Active Trust from appointing a successor Servicer.
 
     In addition, if the Applicable Agreement is deemed an executory contract
under bankruptcy laws, a trustee in bankruptcy of any party to such agreement
(including such party as debtor in possession) may have the power to assume
(i.e., reaffirm) or reject such agreement. A party deciding whether to assume or
reject any such agreement would be given a reasonable period of time to make
such decision, perhaps even until the time of confirmation of the plan of
reorganization, which could result in delays in payments or distributions on the
related securities.
 
     Transfers made in certain isolated transactions contemplated by the
Applicable Agreement (including payments made by NFC or the Seller with respect
to repurchases of Dealer Notes) may be recoverable by NFC or the Seller, as
debtor in possession, or by a trustee in bankruptcy of NFC or the Seller, as a
preferential transfer from NFC or the Seller if such transfers are made within
certain periods prior to the filing of a bankruptcy case in respect of NFC or
the Seller and certain other conditions are met.
 
     In addition, application of federal bankruptcy and state debtor relief laws
to any Dealer could affect the interests of the Active Trust and the Active
Trustee in the Dealer Notes of such Dealer if the enforcement of such laws
result in any Dealer Notes conveyed to the Active Trust being written off as
uncollectible by the Servicer. Whether or not any such Dealer Notes are written
off as uncollectible, delays in payments due on such Dealer Notes could result.
 
                  CERTAIN MATTERS RELATING TO THE DEALER NOTES
 
     The Seller has warranted in the Applicable Agreement that the transfer of
the Dealer Notes to the Active Trust is either (a) a valid transfer and
assignment of the Dealer Notes to the Active Trust or (b) a grant to the Active
Trust of a security interest in the Dealer Notes. The Seller has taken all
required actions under Illinois, New York and Delaware state law to perfect the
Active Trust's interests in such assets. In addition, the Seller has warranted
that, if the transfer of Dealer Notes by the Seller to the Active Trust is a
grant to the Active Trust of a security interest in the Dealer Notes, the Active
Trust will at all times have a first priority perfected security or ownership
interest in all Dealer Notes transferred to the Active Trust and all proceeds
thereof, except that if such a transfer is deemed to create a security interest
under the Uniform Commercial Code, certain prospective liens on the property of
the Seller may have priority over the Active Trust's interests in such Dealer
Notes. If the Seller were to become a debtor in a bankruptcy case, and a
bankruptcy trustee or the Seller as debtor in possession or a creditor of the
Seller were to take the position that the transfer of the Dealer Notes from the
Seller to the Active Trust should be recharacterized as a pledge of such Dealer
Notes, delays in distributions on the Offered Certificates or, should the
bankruptcy court rule in favor of any such trustee, debtor in possession or
creditor, reductions in such distributions could result. There is a substantial
possibility that the Active Trust may not have a perfected security interest in
any of the Dealer Notes created after the filing of a petition for relief under
the Bankruptcy Code. Nevertheless, it is anticipated that the Active Trust will
either own or have a perfected security interest in Dealer Notes existing on the
date of filing a petition under the Bankruptcy Code and will be able to make
payments in respect of principal and interest on
 
                                       100
<PAGE>   117
 
the 1990 Trust Investor Certificates or the Offered Certificates, as the case
may be, although there can be no assurance that all of such payments would be
timely.
 
                              ERISA CONSIDERATIONS
 
     The Employee Retirement Income Security Act of 1974, as amended ("ERISA"),
and the Code impose certain restrictions on employee benefit plans to which they
apply ("Plans") and on persons who have certain specified relationships to Plans
("parties in interest" within the meaning of ERISA and "disqualified persons"
within the meaning of the Code, referred to herein as "Parties in Interest").
ERISA also imposes certain duties on persons who are fiduciaries of Plans and
prohibits a Plan from engaging in a broad range of transactions involving "plan
assets" with Parties in Interest with respect to the Plan, unless a statutory or
administrative exemption applies. Accordingly, Plans with respect to which the
Seller, the Servicer or the Master Trust Trustee are Parties in Interest may be
prohibited from purchasing Offered Certificates unless such an exemption
applies. (Similar rules apply to the investment of individual retirement
accounts as defined in the Code.) Prohibited transactions may generate excise
taxes and other liabilities.
 
     If the assets of the Master Trust were deemed to be assets of Plans that
are Offered Certificateholders, a transaction involving the Master Trust's
assets might give rise to a prohibited transaction under ERISA and the Code,
unless an exemption applies. The U.S. Department of Labor ("DOL") has issued a
regulation (the "Plan Assets Regulation") concerning whether the assets of a
Plan will be deemed to include the underlying assets of an entity (such as a
master trust) when the Plan acquires an "equity" interest in the entity. An
equity interest is defined in the Plan Assets Regulation as an interest in an
entity other than an instrument which is treated as debt under applicable local
law and which has no substantial equity features. The Seller has been advised
that Offered Certificateholders will be taxed as if the Offered Certificates are
debt for federal income tax purposes. If under ERISA the Offered Certificates
are deemed to be debt, the Trust's assets will not be treated as Plan assets
solely as a result of the purchase of an Offered Certificate by a Plan. However,
the tax characterization of the Offered Certificates is not determinative of the
characterization of these securities for ERISA purposes.
 
     Assuming that the Offered Certificates are equity interests under
applicable local law or have substantial equity features, the Plan Assets
Regulation provides that the issuer of a security is not deemed to hold "plan
assets" if the security (a) is freely transferable, (b) is held by 100 or more
investors who are independent of both the issuer and one another, and (c)
satisfies certain registration requirements under the federal securities laws.
There can be no advance assurance that the Offered Certificates will meet the
criteria for this exemption. There will be no restrictions imposed on the
transfer of the Offered Certificates, and if the 100-investor threshold is met,
the Seller intends to cause the registration requirements to be satisfied.
However, it cannot be known in advance whether the 100-investor threshold will
be met by the Offered Certificates, and the Underwriter intends not to sell
Offered Certificates to Plans unless and until it believes the Offered
Certificates will meet the 100-investor threshold.
 
     The Plan Assets Regulation also provides an exemption from "plan assets"
treatment for securities issued by an entity if, immediately after the most
recent acquisition of any equity interest in the entity, less than 25% of the
value of each class of equity interests in the entity is held by "benefit plan
investors" (e.g., Plans, governmental plans, other benefit plans not subject to
ERISA and certain entities whose underlying assets include plan assets by reason
of a Plan's investment in the entity). Because the availability of this
exemption depends upon the identity of the Certificateholders at any time, there
can be no assurance that the Offered Certificates will qualify for this
exemption.
 
     Employee benefit plans that are governmental plans (as defined in section
3(32) of ERISA) and certain church plans (as defined in section 3(33) of ERISA)
are not subject to ERISA requirements. Accordingly, assets of such plans may be
invested in the Offered Certificates without regard to the ERISA restrictions
described above, subject to applicable provisions of other federal and state
laws.
 
     In accordance with ERISA's fiduciary standards, if the Underwriter offers
to sell certificates to Plans, the Plan fiduciary should determine whether an
investment in the Offered Certificates is permitted under the
 
                                       101
<PAGE>   118
 
documents and instruments governing the Plan, consistent with the Plan's overall
investment policy and appropriate in view of the composition of its investment
portfolio. Any Plan fiduciary who proposes to cause a Plan to purchase Offered
Certificates should consult with its own counsel with respect to the potential
consequences under ERISA and the Code of the Plan's acquisition and ownership of
Offered Certificates. Assets of a Plan or individual retirement account should
not be invested in the Offered Certificates unless it is clear that the assets
of the Master Trust will not be plan assets and that the investment by the Plan
will not be a prohibited transaction for which no statutory or administrative
exemption applies.
 
                              PLAN OF DISTRIBUTION
 
     Under the terms and subject to the conditions contained in an underwriting
agreement (the "Underwriting Agreement"), with respect to the Master Trust, the
Seller will agree to sell to each of the underwriters named in the related
Prospectus Supplement, and each of such underwriters will severally agree to
purchase from the Seller, the principal amount of the Offered Certificates set
forth therein and in the Prospectus Supplement.
 
     In the Underwriting Agreement, the underwriter(s) will agree, subject to
the terms and conditions set forth therein, to purchase all the Offered
Certificates which are offered hereby and by the Prospectus Supplement if any of
such Offered Certificates are purchased. In the event of a default by any such
underwriter, the Underwriting Agreement will provide that, in certain
circumstances, purchase commitments of the nondefaulting underwriters, if any,
may be increased or the Underwriting Agreement may be terminated.
 
     The Prospectus Supplement will either (i) set forth the price at which
Offered Certificates will be offered to the public and any concessions that may
be offered to certain dealers participating in the offering of such Offered
Certificates or (ii) specify that the Offered Certificates are to be resold by
the underwriter(s) in negotiated transactions at varying prices to be determined
at the time of such sale. After the initial public offering of any Offered
Certificates, the public offering price and such concessions may be changed.
 
     The underwriter(s), may engage in over-allotment, stabilizing transactions,
syndicate covering transactions and penalty bids in accordance with Regulation M
under the Exchange Act. Over-allotment involves syndicate sales in excess of the
offering size, which creates a syndicate short position. Stabilizing
transactions permit bids to purchase the underlying security so long as the
stabilizing bids do not exceed a specified maximum. Syndicate covering
transactions involve purchases of the Offered Certificates in the open market
after the distribution has been completed in order to cover syndicate short
positions. Penalty bids permit the underwriter(s) to reclaim a selling
concession from a syndicate member when the Offered Certificates originally sold
by such syndicate member are purchased in a syndicate covering transactions and
penalty bids may cause the prices of the Offered Certificates to be higher than
they would otherwise be in the absence of such transactions. These transactions,
if commenced, may be discontinued at any time.
 
     The Underwriting Agreement will provide that NFC and the Seller will
indemnify the underwriter(s) against certain liabilities, including liabilities
under the Securities Act.
 
     The Master Trust Trustee may, from time to time, invest the funds acquired
from the underwriters in the Excess Funding Account in Eligible Investments.
 
     The place and time of delivery for the Offered Certificates in respect of
which this Prospectus is delivered will be set forth in the Prospectus
Supplement.
 
                                 LEGAL MATTERS
 
     The legality of the Offered Certificates and certain legal matters
regarding tax consequences of the issuance of the Offered Certificates and
creditors rights will be passed upon for NFC and the Seller by Kirkland & Ellis,
Chicago, Illinois.
 
                                       102
<PAGE>   119
 
                                 INDEX OF TERMS
 
<TABLE>
<S>                                                             <C>
1990 Trust..................................................         1
1990 Trust Agreement........................................     1, 21
1990 Trust Amortization Event...............................        82
1990 Trust Amortization Period..............................        86
1990 Trust Amortization Term................................        87
1990 Trust Available Subordinated Amount....................        83
1990 Trust Collections......................................        81
1990 Trust Collections Account..............................        81
1990 Trust Deficiency Amount................................        75
1990 Trust Distribution Account.............................        81
1990 Trust Early Amortization Period........................        83
1990 Trust Excess Servicing.................................        24
1990 Trust Interest Deposit Account.........................        37
1990 Trust Interest Deposit Agreement.......................        37
1990 Trust Investment Income................................        74
1990 Trust Investment Securities............................        84
1990 Trust Investor Certificate Interest....................        88
1990 Trust Investor Certificates............................        22
1990 Trust Investor Interest Income.........................        85
1990 Trust Investor Loss Amount.............................        86
1990 Trust Liquidity Reserve Account........................        81
1990 Trust Maximum Subordinated Amount......................        84
1990 Trust Minimum Seller Interest..........................        83
1990 Trust Minimum Subordinated Amount......................        84
1990 Trust Monthly Servicing Fee............................        53
1990 Trust Non-Amortization Period..........................        86
1990 Trust Principal Losses.................................        86
1990 Trust Projected Spread.................................        81
1990 Trust Purchase Agreement...............................        90
1990 Trust Seller Collections...............................        12
1990 Trust Seller Interest..................................        23
1990 Trust Seller Interest Income...........................        88
1990 Trust Servicer Termination Event.......................        55
1990 Trust Spread Account...................................        81
1990 Trust Spread Account Deposit...........................        81
1990 Trust Termination Date.................................     5, 60
1990 Trust Total Invested Amount............................        54
1990 Trust Total Investor Interest..........................        50
1990 Trust Total Investor Percentage........................        53
1990 Trust Trustee..........................................     1, 21
Accumulation Period.........................................        15
Accumulation Period Commencement Date.......................        15
Accumulation Period Length..................................        15
Accumulation Period Principal Shortfall.....................        68
Acquisition.................................................        48
Active Interest Deposit Agreement...........................        37
Active Purchase Agreement...................................        90
Active Trust................................................         7
Active Trustee..............................................        48
Adjusted Invested Amount....................................        63
</TABLE>
 
                                       103
<PAGE>   120
Advance.....................................................        52
Advance Reimbursement.......................................        53
Aggregate NITC Earned Interest..............................        52
Agreements..................................................        53
Amortizing Class............................................        74
Applicable Agreement........................................         7
Applicable Floating Rate....................................        20
Applicable Voting Percentage................................        79
Assignments.................................................        48
Available Certificateholder Interest Collections............        65
Available Draw Funds........................................        66
Available Seller's Finance Charge Collections...............        64
Available Seller's Principal Collections....................        64
Available Subordinated Amount...............................    19, 69
Average Coverage Differential...............................        83
Calculation Day.............................................        37
Cede........................................................         3
CEDEL.......................................................        44
Certificate Principal.......................................        74
Certificate Principal Account...............................        81
Certificate Principal Account Losses........................        86
Certificate Register........................................        40
Certificateholder Charge-Off................................        71
Certificateholders..........................................         7
Certificateholders' Interest................................        48
Certificates................................................         1
Citibank....................................................        43
Class A-1 Investor Certificates.............................        22
Class A-2 Investor Certificates.............................        22
Class A-3 Investor Certificates.............................        22
Class A-4 Investor Certificate..............................        22
Class Amortization Date.....................................        83
Class Amortization Percentages..............................        75
Class Amortization Period...................................        41
Class Certificate Margin....................................        80
Class Certificate Rate......................................        80
Class Charged-Off Amounts...................................        87
Class Initial Invested Amount...............................        87
Class Invested Amount.......................................        87
Class Investor Interest.....................................        86
Class Loss Amount...........................................        87
Class Termination Date......................................        89
Closing Date................................................         8
Code........................................................        92
Collections.................................................        61
Collections Account.........................................        56
Commission..................................................         3
Concentration Limit.........................................        29
Contributed Dealer Notes....................................        90
Controlled Amortization Amount..............................        68
Controlled Deposit Amount...................................        68
Cooperative.................................................        44
Corporate Trust Office......................................        77
 
                                       104
<PAGE>   121
Credit Guidelines...........................................        32
Current Interest Rate.......................................        37
Daily Note Sale.............................................        91
Dealer......................................................        32
Dealer Agreement............................................        32
Dealer Finance Charge Collections...........................        53
Dealer Finance Charges......................................        52
Dealer Note Collections.....................................        62
Dealer Note Losses..........................................        63
Dealer Notes................................................        31
Deficiency Amount...........................................        66
Definitive Certificates.....................................        45
Deposit Amount..............................................        37
Determination Date..........................................        46
Disclosure Document.........................................        29
Distribution Account........................................        56
Distribution Date...........................................     1, 52
Distribution Period.........................................        52
DOL.........................................................       101
Draw Amount.................................................        67
DTC.........................................................         2
Due Period..................................................        52
Early Amortization Event....................................        72
Early Amortization Period...................................        73
Early Amortization Period Commencement Date.................        73
Early Amortization Period Shortfall Amount..................        69
Early Distribution..........................................        72
Early Distribution Amount...................................        72
Early Distribution Date.....................................        72
Eligible Dealer Note........................................        48
Eligible Deposit Account....................................        56
Eligible Institution........................................        57
Eligible Investments........................................        57
Enhancement.................................................        47
Enhancement Agreement.......................................        61
Enhancement Provider........................................        62
ERISA.......................................................       101
Euroclear...................................................        44
Euroclear Operator..........................................        44
Euroclear Participants......................................        44
Excess Funding Account......................................        56
Excess Interest Collections.................................        66
Excess Seller's Percentage..................................        64
Excess Seller's Principal Collections.......................        65
Exchange Act................................................         3
Expected Payment Date.......................................        41
FDIC........................................................        80
Finance Charge Collections..................................        63
Finance Charges.............................................        52
Financed Vehicles...........................................        32
Flat Charge.................................................        35
Floating Allocation Percentage..............................        64
Foreign Agency Depositaries.................................        43
 
                                       105
<PAGE>   122
foreign holder..............................................        96
Fully Funded Date...........................................        14
Harco.......................................................        33
Independent Directors.......................................        99
Indirect Participants.......................................        43
Ineligible Dealer Note......................................        50
Initial Investment Amount...................................         1
Insurance Proceeds..........................................        31
Interest Credit.............................................        39
Interest Deposit Account....................................        37
Interest Rate Swap..........................................        20
Invested Amount.............................................        63
Investment Events...........................................        72
Investment Income...........................................        61
Investment Period...........................................    11, 14
Investment Period Commencement Date.........................        72
Investment Period Shortfall Amount..........................        69
Investor Loss Amount........................................        74
IRS.........................................................        92
LIBOR.......................................................        27
Liquidity Reserve Account...................................        19
Master Intercompany Agreement...............................        37
Master Loan.................................................        90
Master Revolving Credit Agreement...........................        31
Master Revolving Note.......................................        31
Master Trust................................................         1
Master Trust Adjusted Investment Amount.....................        63
Master Trust Invested Amount................................        63
Master Trust Purchase Agreement.............................        90
Master Trust Seller's Certificates..........................        46
Master Trust Seller's Interest..............................        58
Master Trust Servicer Termination Event.....................        55
Master Trust Trustee........................................      1, 5
Maximum Subordinated Amount.................................        70
Minimum Master Trust Seller's Interest......................        58
Minimum Series Seller's Interest............................        59
Monthly Interest............................................         9
Navistar Group..............................................        48
Navistar Vehicle............................................        31
Negative Carry Reserve Fund.................................        59
Negative Carry Reserve Fund Deposit Amount..................        59
Negative Carry Reserve Fund Required Amount.................        59
Negative Carry Subordinated Amount..........................        70
Net Swap Payment............................................        20
Net Swap Receipt............................................        20
New Issuance................................................         9
NFC.........................................................         1
NFSC........................................................         1
NFSC Certificate............................................        46
NIC.........................................................        48
NITC Earned Interest........................................        37
NITC Finance Charges........................................        52
NITC Future Due Interest....................................        37
 
                                       106
<PAGE>   123
NITC Interest Amount........................................        37
NITC Interest Transfer Date.................................        62
NITC Payment Date...........................................        37
Non-Amortization Period.....................................        84
Non-Amortizing Class........................................        84
Non-Interest Bearing Dealer Notes...........................        37
OEM Note....................................................        49
OEM Supplier................................................        48
OEM Vehicle.................................................        31
Offered Certificate Rate....................................        41
Offered Certificateholders..................................         2
Offered Certificateholders' Interest........................         9
Offered Certificates........................................         1
Offered Series..............................................         1
Offered Series Dealer Note Losses...........................        64
Offered Series Finance Charge Collections...................        64
Offered Series Principal Collections........................        63
Offered Series Servicing Fee................................        54
OID.........................................................        94
Open Account................................................        40
Open Account Statement......................................        35
Participants................................................        43
Parties in Interest.........................................       100
Plan Assets Regulation......................................       101
Plans.......................................................       100
Pooling and Servicing Agreement.............................     1, 40
Principal Allocation Percentage.............................        64
Principal Collections.......................................        62
Principal Shortfall.........................................        68
Principal Terms.............................................        47
Projected Spread............................................        70
Prospectus Supplement.......................................         1
Purchase Agreements.........................................        90
Qualified Institution.......................................        80
Rating Agencies.............................................        58
Rating Agency Condition.....................................        58
Record Date.................................................        41
Registration Statement......................................         3
Related 1990 Certificate....................................         2
Related 1990 Certificate Collections........................         8
Related 1990 Certificate Interest Collections...............        41
Related 1990 Certificate Principal Collections..............        41
Related 1990 Certificate Rate...............................        22
Remaining Available Seller's Principal Collections..........        69
Required Excess Seller Interest Percentage..................        65
Required Subordinated Amount................................        70
Retail SPAs.................................................        38
Revolving Period............................................        13
Scheduled Class Amortization Date...........................        82
Securities Act..............................................         3
Seller......................................................         1
Seller's Percentage.........................................        65
Seller's Principal Collections..............................        65
 
                                       107
<PAGE>   124
Series......................................................         2
Series Accounts.............................................        57
Series Allocable Dealer Note Losses.........................        63
Series Allocable Finance Charge Collections.................        63
Series Allocable Principal Collections......................        62
Series Allocable Servicing Fee..............................        54
Series Allocation Percentage................................        62
Series Issuance Date........................................        47
Series Principal Account....................................        15
Series Principal Account Losses.............................        63
Series Termination Date.....................................        73
Servicer....................................................         1
Servicer Termination Event..................................        45
Servicing Fee...............................................        53
Shared Seller Principal Collections.........................        69
Shared Principal Collections................................        68
Special Servicer Agent......................................        56
Specified Accumulation Period Commencement Date.............        15
Spread Account..............................................        17
Spread Account Deposit Amount...............................        70
Subordinated Percentage.....................................        70
Subsequent 1990 Trust Investor Certificate..................         2
Supplement..................................................         9
Supplemental Certificate....................................        46
Swap Counterparty...........................................        59
Swap Fixed Rate.............................................        59
Swap Floating Rate..........................................        60
Swap Payment................................................        20
Swap Receipt................................................        20
Tax Counsel.................................................        92
Tax Opinion.................................................        47
Terms and Conditions........................................        45
Transfer Date...............................................        71
Trust Accounts..............................................        80
Trustees....................................................        54
Trusts......................................................        53
Turnover....................................................        83
Uncollectible Finance Charges...............................        53
Underwriting Agreement......................................       102
Uniform Commercial Code.....................................        26
United States person........................................        96
Unpaid Dealer Finance Charges...............................        52
Up-Front Interest Credit....................................        37
Wholesale Note and Inventory Statement......................        35
 
                                       108
<PAGE>   125
 
ANNEX I
 
                          GLOBAL CLEARANCE, SETTLEMENT
                        AND TAX DOCUMENTATION PROCEDURES
 
     Except in certain limited circumstances, the globally Offered Certificates
(the "Global Securities") will be available only in book-entry form. Investors
in the Global Securities may hold such Global Securities through any of DTC,
CEDEL or Euroclear. The Global Securities will be tradeable as home market
instruments in both the European and U.S. domestic markets. Initial settlement
and all secondary trades will settle in same day funds.
 
     Secondary market trading between investors holding Global Securities
through CEDEL and Euroclear will be conducted in the ordinary way in accordance
with their normal rules and operating procedures and in accordance with
conventional eurobond practice (i.e., seven calendar day settlement).
 
     Secondary market trading between investors holding Global Securities
through DTC will be conducted according to the rules and procedures applicable
to U.S. corporate debt obligations.
 
     Secondary cross-marketing trading between CEDEL or Euroclear and DTC
participants holding Global Securities will be effected on a
delivery-against-payment basis through Citibank, N.A. ("Citibank") and Morgan
Guaranty Trust Company of New York ("Morgan") as the respective depositaries of
CEDEL and Euroclear and as participants in DTC.
 
     Non-U.S. holders of Global Securities will be exempt from U.S. withholding
taxes, provided that such holders meet certain requirements and deliver
appropriate U.S. tax documents to the securities clearing organizations or their
participants.
 
INITIAL SETTLEMENT
 
     All Global Securities will be held in book-entry form by DTC in the name of
Cede Co. as nominee of DTC. Investors' interests in the Global Securities will
be represented through financial institutions acting on their behalf as direct
and indirect participants in DTC. As a result, CEDEL and Euroclear will hold
positions on behalf of their participants through their respective depositaries,
Citibank and Morgan, which in turn will hold such positions in accounts as
participants of DTC.
 
     Investors electing to hold their Global Securities through DTC will follow
the settlement practices applicable to securities previously issued by the
Master Trust. Investor securities custody accounts will be credited with their
holdings against payment in same-day funds on the settlement date.
 
     Investors electing to hold their Global Securities through CEDEL or
Euroclear accounts will follow the settlement procedures applicable to
conventional eurobonds, except that there will be no temporary global security
and no "lock-up" or restricted period. Global Securities will be credited to the
securities custody accounts on the settlement date against payment in same-day
funds.
 
SECONDARY MARKET TRADING
 
     Since the purchaser determines the place of delivery, it is important to
establish at the time of the trade where both the purchaser's and seller's
accounts are located to ensure that settlement can be made on the desired value
date.
 
     Trading between DTC participants. Secondary market trading between DTC
participants will be settled using the procedures applicable to securities
previously issued by the Master Trust in same-day funds.
 
     Trading between CEDEL and/or participants. Secondary market trading between
CEDEL participants and/or Euroclear participants will be settled using the
procedures applicable to conventional eurobonds in same-day funds.
 
                                       109
<PAGE>   126
 
     Finally, day traders that use CEDEL or Euroclear and that purchase Global
Securities from DTC participants for delivery to CEDEL participants or Euroclear
participants should note that these trades would automatically fail on the sale
side unless affirmative action were taken. At least three techniques should be
readily available to eliminate this potential problem:
 
          (1) borrowing through CEDEL or Euroclear for one day (until the
     purchase side of the day trade is reflected in their CEDEL or Euroclear
     accounts) in accordance with the clearing system's customary procedures;
 
          (2) borrowing the Global Securities in the U.S. from a DTC participant
     no later than one day prior to settlement, which would give the Global
     Securities sufficient time to be reflected in their CEDEL or Euroclear
     account in order to settle the sale side of the trade; or
 
          (3) staggering the value dates for the buy and sell sides of the trade
     so that the value date for the purchase from the DTC participants is at
     least one day prior to the value date for the sale to the CEDEL participant
     or Euroclear participants.
 
CERTAIN U.S. FEDERAL INCOME TAX DOCUMENTATION REQUIREMENTS
 
     A holder of Global Securities holding securities through CEDEL or Euroclear
(or through DTC if the holder has an address outside the U.S.) will be subject
to the 30% U.S. withholding tax that generally applies to payments of interest
(including original issue discount) on registered debt issued by U.S. persons
unless such holder takes one of the following steps to obtain an exemption or
reduced tax rate:
 
     Exemption for non-U.S. persons with effectively connected income (Form
4224). A non-U.S. person, including a non-U.S. corporation or bank with a U.S.
branch, for which the interest income is effectively connected with its conduct
of a trade or business in the United States, can obtain an exemption from the
withholding tax by filing Form 4224 (Exemption from Withholding of Tax on Income
Effectively Connected with the Conduct of a Trade or Business in the United
States).
 
     Exemption or reduced rate for non-U.S. persons resident in treaty countries
(Form 1001). Non-U.S. persons that are beneficial owners residing in a country
that has a tax treaty with the United States can obtain an exemption or reduced
tax rate (depending on the treaty terms) by filing Form 1001 (Ownership,
Exemption or Reduced Rate Certificate). If the treaty provides only for a
reduced rate, withholding tax will be imposed at that rate unless the filer
alternatively files Form W-8. Form 1001 may be filed by the beneficial owner or
his agent.
 
     Exemption for U.S. persons (Form W-9). U.S. persons can obtain a complete
exemption from the withholding tax by filing Form W-9 (Request for Taxpayer
Identification Number and Certification).
 
     U.S. Federal Income Tax Reporting Procedure. The holder of Global Security,
or in the case of a Form 1001 or a Form 4224 filer, his agent, files by
submitting the appropriate form to the person through whom he holds (the
clearing agency, in the case of persons holding directly on the books of the
clearing agency). Form W-8 and Form 1001 are effective for three calendar years
and Form 4224 is effective for one calendar year.
 
     This summary does not deal with all aspects of federal income tax
withholding that may be relevant to foreign holders of these Global Securities.
Investors are advised to consult their own tax advisors for specific tax advice
concerning their holding and disposing of the Global Securities.
 
                                       110
<PAGE>   127
 
           ---------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS
SUPPLEMENT AND THE PROSPECTUS IN CONNECTION WITH THE OFFER MADE BY THIS
PROSPECTUS SUPPLEMENT AND THE PROSPECTUS, AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY NIC, NITC, NFC, NFSC OR THE UNDERWRITER. THIS PROSPECTUS SUPPLEMENT AND THE
PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF ANY OFFER TO
BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES OFFERED BY THIS
PROSPECTUS SUPPLEMENT AND THE PROSPECTUS, NOR DOES IT CONSTITUTE AN OFFER TO
SELL OR A SOLICITATION OF ANY OFFER TO BUY ANY SECURITIES BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED, OR IN WHICH
THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO
ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. NEITHER
THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT
INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                 PAGE
                                                 ----
<S>                                              <C>
The Dealer Notes...............................   S-3
Description of the Series 1997-1
  Certificates.................................   S-9
Other Series Issued By Master Trust............  S-13
1990 Trust Investor Certificates...............  S-14
Underwriting...................................  S-15
Legal Opinions.................................  S-15
Index of Terms.................................  S-16
</TABLE>
 
                                   PROSPECTUS
 
<TABLE>
<CAPTION>
                                                 PAGE
                                                 ----
<S>                                              <C>
Available Information..........................    3
Reports to the Offered Certificateholders......    3
Incorporation of Certain Documents by
  Reference....................................    3
Prospectus Summary.............................    5
Risk Factors...................................   26
Navistar Financial Securities Corporation and
  the Master Trust.............................   30
Use of Proceeds................................   31
The Navistar Financial Dealer Floor Plan
  Financing Business...........................   31
Relationship with NITC.........................   36
Description of the Offered Certificates........   40
Terms of the 1990 Trust Investor
  Certificates.................................   80
Description of the Purchase Agreements.........   90
Federal Income Tax Matters.....................   92
Certain State Tax Matters......................   98
Certain Matters Relating to Bankruptcy.........   99
Certain Matters Relating to the Dealer Notes...  100
ERISA Considerations...........................  101
Plan of Distribution...........................  102
Legal Matters..................................  102
Index of Terms.................................  103
Annex I -- Global Clearance, Settlement and Tax
  Documentation Procedures.....................  109
</TABLE>
 
    UNTIL         , 1997, ALL DEALERS EFFECTING TRANSACTIONS IN THE SERIES
1997-1 CERTIFICATES, WHETHER OR NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE
REQUIRED TO DELIVER A PROSPECTUS SUPPLEMENT AND THE PROSPECTUS TO WHICH IT
RELATES. THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS
TO DELIVER A PROSPECTUS SUPPLEMENT AND PROSPECTUS WHEN ACTING AS UNDERWRITERS
AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
           =========================================================
 
                               NAVISTAR FINANCIAL
                             SECURITIES CORPORATION
                                     SELLER
 
                                  $200,000,000
 
                           FLOATING RATE DEALER NOTE
                           ASSET BACKED CERTIFICATES
                                 SERIES 1997-1
 
                      NAVISTAR FINANCIAL CORPORATION LOGO
 
                         NAVISTAR FINANCIAL CORPORATION
                                    SERVICER
 
                             PROSPECTUS SUPPLEMENT
 
                           CREDIT SUISSE FIRST BOSTON
 
           ---------------------------------------------------------


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