<PAGE>
AmeriCredit Automobile Receivables Trust 1999-D
Class A-1 6.4100% Asset Backed Notes
Class A-2 6.7900% Asset Backed Notes
Class A-3 7.0200% Asset Backed Notes
Preliminary Servicer's Certificate
This Servicer's Certificate has been prepared pursuant to Section 4.9 of the
Sale and Servicing Agreement among AmeriCredit Automobile Receivables Trust
1999-D, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS
Funding Corp., as Seller, and Bank One, N.A., as Backup Servicer and Trust
Collateral Agent, dated as of October 13, 1999. Defined terms have the meanings
assigned to them in the Sale and Servicing Agreement or in other Transaction
Documents.
The undersigned hereby certifies that no Trigger Event has occurred on the
related Determination Date and that, to the knowledge of the Servicer, no
Insurance Agreement Event of Default has occurred.
Monthly Period Beginning: 05/01/2000
Monthly Period Ending: 05/31/2000
<TABLE>
<CAPTION>
<S> <C> <C> <C> <C> <C>
I. MONTHLY PERIOD RECEIVABLES PRINCIPAL BALANCE CALCULATION:
A. Beginning of period Aggregate Principal Balance $815,204,747
------------
B. Purchase of Subsequent Receivables 0
------------
C. Monthly Principal Amounts
(1) Collections on Receivables outstanding
at end of period 22,460,957
------------
(2) Collections on Receivables paid off
during period 7,217,095
------------
(3) Receivables becoming Liquidated Receivables
during period 4,709,947
------------
(4) Receivables becoming Purchased Receivables
during period
------------
(5) Cram Down Losses occurring during period
------------
(6) Other Receivables adjustments 152,472
------------
(7) Less amounts allocable to Interest (12,008,670)
------------
Total Monthly Principal Amounts 22,531,801
------------
D. End of period Aggregate Principal Balance $792,672,946
------------
E. Pool Factor 88.0747746%
============
II. MONTHLY PERIOD NOTE BALANCE CALCULATION:
Class A-1 Class A-2 Class A-3 TOTAL
------------ ------------ ------------ ------------
A. Beginning of period Note Balance $337,055,880 $192,000,000 $258,000,000 $787,055,880
---------------------------------------------------------
B. Noteholders' Principal Distributable Amount 22,531,801 0 0 22,531,801
C. Noteholders' Accelerated Principal Amount 3,332,835 0 0 3,332,835
D. Accelerated Payment Amount Shortfall 126,995 0 0 126,995
E. Note Prepayment Amount 0 0 0 0
F. Deficiency Claim Amount 0 0 0 0
---------------------------------------------------------
G. End of period Note Balance $311,064,249 $192,000,000 $258,000,000 $761,064,249
=========================================================
H. Note Pool Factors 69.1253887% 100.0000000% 100.0000000% 84.5626943%
=========================================================
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III. RECONCILIATION OF PRE-FUNDING ACCOUNT:
A. Beginning of period Pre-Funding Account balance $0
------------
B. Purchase of Subsequent Receivables 0
------------
C. Investment Earnings 0
------------
D. Investment Earnings Transfer to Collections Account 0
------------
E. Payment of Mandatory Prepayment Amount
------------
0
------------
F. End of period Pre-Funding Account balance $0
============
IV. CALCULATION OF PRINCIPAL DISTRIBUTABLE AMOUNT
A. Total Monthly Principal Amounts $22,531,801
------------
B. Required Pro-forma Note Balance 713,405,651
------------
C. Pro-forma Note Balance (Assuming 100% Paydown of Total
Monthly Principal Amounts) 764,524,079
------------
D. Step-down Amount (B.-C.) 0
------------
E. Principal Distributable Amount (A.-D.) $22,531,801
============
V. RECONCILIATION OF CAPITALIZED INTEREST ACCOUNT:
A. Beginning of period Capitalized Interest Account balance $0
------------
B. Monthly Capitalized Interest Amount 0
------------
C. Investment Earnings 0
------------
D. Investment Earnings Transfer to Collections Account 0
------------
E. Payment of Overfunded Capitalized Interest Amount 0
------------
F. Payment of Remaining Capitalized Interest Account 0
------------
0
------------
G. End of period Capitalized Interest Account balance $0
============
VI. RECONCILIATION OF COLLECTION ACCOUNT:
A. Available Funds:
(1) Collections on Receivables during period
(net of Liquidation Proceeds) $29,678,052
------------
(2) Liquidation Proceeds collected
during period 2,253,466
------------
(3) Purchase Amounts deposited in Collection
Account
------------
(4) (a) Investment Earnings - Collection Account 136,305
------------
(b) Investment Earnings - Transfer From Prefunding Account 0
------------
(c) Investment Earnings - Transfer From Capitalized
Interest Account 0
------------
(5) Collection of Supplemental Servicing Fees
(a) Extension Fees 105,112
------------
(b) Repo and Recovery Fees Advanced 103,081
------------
(c) Other Fees 136,298
------------
(6) Monthly Capitalized Interest Amount 0
------------
(7) Mandatory Prepayment Amount
------------
Total Available Funds 32,412,314
============
B. Distributions:
(1) Base Servicing Fee and Supplemental Servicing Fees
(a) Base Servicing Fee 1,528,509
------------
(b) Repo and Recovery Fees 103,081
------------
(c) Bank Service Charges 13,466
------------
(d) Other Fees 136,298
------------
(2) Agent fees 417
------------
(3) Refunds of Overpayments paid by AFS 36,837
------------
(4) Noteholders' Interest Distributable Amount
(a) Class A-1 1,800,440
------------
(b) Class A-2 1,086,400
------------
(c) Class A-3 1,509,300
------------
(5) Noteholders' Principal Distributable Amount
(a) Class A-1 22,531,801
------------
(b) Class A-2 0
------------
(c) Class A-3 0
------------
(6) Security Insurer Premiums
(a) FSA Insurance Premium 158,555
------------
(b) RCCA Premium 174,375
------------
Total distributions 29,079,479
------------
C. Excess Available Funds (or Deficiency Claim Amount) 3,332,835
------------
D. Noteholders' Accelerated Principal Amount (3,332,835)
------------
E. Deposit to Spread Account $0
------------
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VII. CALCULATION OF ACCELERATED PRINCIPAL AMOUNT
A. Excess Available Funds (VI.C.) $3,332,835
------------
B. Pro Forma Note Balance (II.A.-II.B.) 764,524,079
------------
C. Required Pro Forma Note Balance (90% x (I.D.+III.F.) 713,405,651
------------
D. Excess of Pro Forma Balance over Required Balance (B.-C.) 51,118,428
------------
E. End of Period Class A-1 Note Balance (before accel. payments) 311,191,244
------------
F. Lesser of D. or E. 51,118,428
------------
G. Accelerated Principal Amount (lesser of A. or F.) $3,332,835
------------
VIII. CALCULATION OF ACCELERATED PAYMENT AMOUNT SHORTFALL
A. Pro Forma Note Balance $764,524,079
------------
B. Required Pro Forma Note Balance 713,405,651
------------
C. Excess of Pro Forma Balance over Required Balance (A.-B.) 51,118,428
------------
D. End of Period Class A-1 Note Balance (before accel. payments) 311,191,244
------------
E. Greater of C. or D. 311,191,244
------------
F. Excess Available Funds (VI.C.) 3,332,835
------------
G. Investment Earnings on Collection Account 136,305
------------
H. Accelerated Payment Amount Shortfall (E.- F.+G.) $307,994,714
------------
IX. RECONCILIATION OF SPREAD ACCOUNT:
A. Beginning of period Spread Account balance $26,999,999
------------
B. Additions to Spread Account
(1) Deposits from Collections Account (VI. E.) 0
------------
(2) Investment Earnings 126,995
------------
(3) Deposits Related to Subsequent Receivables Purchases 0
------------
Total Additions 126,995
------------
C. Spread Account balance available for withdrawals 27,126,994
------------
D. Requisite Amount of Spread Account
(1) Initial Spread Account Deposit $18,000,000
------------
(2) Subsequent Spread Account Deposits 8,999,999
------------
(3) Total Initial & Subsequent Spread Account Deposits (1)+(2) 26,999,999
------------
(4) $100,000 100,000
------------
(5) 1 1/2% of Original Pool Balance (total deliveries) $13,500,000
------------
(6) End of period Note Balance 761,064,249
------------
(7) Lesser of (5) or (6) 13,500,000
------------
(8) Floor Amount Greater of (4) or (7) 13,500,000
------------
(9) Aggregate Principal Balance 792,672,946
------------
(10) End of period Note Balance 761,064,249
------------
(11) Line (9) less line (10) (During Funding Period
amount equal to zero) 31,608,697
------------
(12) OC level (11)/(9) 3.99%
------------
(13) Spread Ending Balance as a Percent of Aggregate Principal Balance 3.41%
------------
(14) OC Percentage (12) + (13) 7.40%
------------
(15) 13% less OC level, if OC percentage is greater than or equal to 13% n/a
(16) If OC percentage is equal to or greater than 13%,
------------
Percent in (15) x End of Period
Aggregate Principal Balance n/a
------------
(17) If OC Percentage is less than 13%, 3% of Original Pool Balance
(total deliveries) 26,999,999
------------
(18) 15% of end of period Aggregate Principal Balance if Trigger Date n/a
------------
Requisite Amount of Spread Account (either (3), (8), (14), (16), (17) or
(18) as applicable) 26,999,999
------------
E. Withdrawals from Spread Account
(1) Priority First - Deficiency Claim Amount 0
------------
(2) Priority Second through Third
------------
(3) Priority Fourth - Accelerated Payment Amount Shortfall 307,994,714
------------
Accelerated Payment Amount Shortfall in Excess of
Requisite Amount 126,995
------------
(4) Priority Fifth through Sixth
------------
(5) Priority Seventh - to Servicer
------------
Total withdrawals 126,995
------------
F. End of period Spread Account balance $26,999,999
------------
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X. MONTHLY PERIOD NUMBER OF RECEIVABLES CALCULATION:
A. Beginning of period number of Receivables 60,805
------------
B. Number of Subsequent Receivables Purchased 0
------------
C. Number of Receivables becoming Liquidated
Receivables during period 338
------------
D. Number of Receivables becoming Purchased
Receivables during period
------------
E. Number of Receivables paid off during period 644
------------
F. End of period number of Receivables 59,823
============
XI. STATISTICAL DATA:
A. Weighted Average APR of the Receivables 18.33%
------------
B. Weighted Average Remaining Term of the Receivables 52.24
------------
C. Average Receivable Balance $13,250
------------
D. Aggregate Realized Losses $7,833,641
------------
</TABLE>
By: /s/ Preston A. Miller
---------------------------------------
Name: Preston A. Miller
---------------------------------------
Title: Executive Vice President and Treasurer
---------------------------------------
Date: June 2, 2000
---------------------------------------
4
<PAGE>
AmeriCredit Automobile Receivables Trust 1999-D
Class A-1 6.4100% Asset Backed Notes
Class A-2 6.7900% Asset Backed Notes
Class A-3 7.0200% Asset Backed Notes
Servicer's Certificate
This Servicer's Certificate has been prepared pursuant to Section 4.9 of the
Sale and Servicing Agreement among AmeriCredit Automobile Receivables Trust
1999-D, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS
Funding Corp., as Seller, and Bank One, N.A., as Backup Servicer and Trust
Collateral Agent, dated as of October 13, 1999. Defined terms have the meanings
assigned to them in the Sale and Servicing Agreement or in other Transaction
Documents.
The undersigned hereby certifies that no Trigger Event has occurred on the
related Determination Date and that, to the knowledge of the Servicer, no
Insurance Agreement Event of Default has occurred.
Monthly Period Beginning: 05/01/2000
Monthly Period Ending: 05/31/2000
<TABLE>
<CAPTION>
<S> <C> <C> <C> <C> <C>
I. MONTHLY PERIOD NOTE BALANCE CALCULATION:
Class A-1 Class A-2 Class A-3 TOTAL
------------ ------------ ------------ ------------
A. Preliminary End of period Note Balance $311,064,249 $192,000,000 $258,000,000 $761,064,249
---------------------------------------------------------
B. Deficiency Claim Amount 0 0 0 0
C. End of period Note Balance $311,064,249 $192,000,000 $258,000,000 $761,064,249
=========================================================
D. Note Pool Factors 69.1253887% 100.0000000% 100.0000000% 84.5626943%
=========================================================
II. RECONCILIATION OF SPREAD ACCOUNT:
A. Preliminary End of period Spread Account balance $26,999,999
------------
B. Priority First - Deficiency Claim Amount from preliminary certificate 0
------------
C. End of period Spread Account balance $26,999,999
------------
III. PERFORMANCE TESTS:
A. Delinquency Ratio
(1) Receivables with Scheduled Payment
delinquent more than 60 days
at end of period $17,208,618
------------
(2) Purchased Receivables with Scheduled Payment delinquent
more than 60 days at end of period
------------
(3) Beginning of period Principal Balance 815,204,747
------------
(4) Delinquency Ratio (1)+(2) divided by (3) 2.11%
------------
(5) Previous Monthly Period Delinquency Ratio 1.77%
------------
(6) Second previous Monthly Period Delinquency Ratio 1.30%
------------
(7) Average Delinquency Ratio (4)+(5)+(6)
divided by 3 1.73%
------------
(8) Compliance (Delinquency Test Failure is a
Delinquency Ratio equal to or greater than 5.00%) yes
------------
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<PAGE>
B. Cumulative Default Rate
(1) Defaulted Receivables in Current Period $5,419,902
------------
(2) Cumulative Defaulted Receivables Including
Defaulted Receivables in Current Period 24,334,806
------------
(3) Original Pool Balance 899,999,971
------------
(4) Cumulative Default Rate (2) divided by (3) 2.70%
------------
(5) Compliance (Default Test Failure is a Cumulative
Default Rate equal to or greater than 11.81%.) yes
------------
C. Cumulative Net Loss Rate
(1) Receivables becoming Liquidated Receivables during period $4,709,947
------------
(2) Purchased Receivables with Scheduled
Payment delinquent more than 30 days at end of period
------------
(3) Cram Down Losses occurring during period
------------
(4) Liquidation Proceeds collected during period (2,253,466)
------------
(5) Net Losses during period (1)+(2)+(3)-(4) 2,456,481
------------
(6) Net Losses since Initial Cut-off Date (Beginning of Period) 5,377,160
------------
(7) Cumulative Net Loss Rate before 50% of 90 Day Delinquencies
(5) + (6) divided by (9) 0.87%
------------
(8) 50% of Receivables with Scheduled Payment delinquent
more than 90 days at end of period 4,043,180
------------
(9) Original Aggregate Principal Balance plus Pre-Funded Amount
as of the Closing Date 900,000,000
------------
(10) Cumulative Net Loss Rate (5)+(6)+(8)
divided by (9) 1.32%
------------
(11) Compliance (Net Loss Test Failure is a
Net Loss Rate equal to or greater than 6.75%.) yes
------------
D. Extension Rate
(1) Principal Balance of Receivables extended during current period $11,795,769
------------
(2) Beginning of Period Aggregate Principal Balance 815,204,747
------------
(3) Extension Rate (1) divided by (2) 1.45%
------------
(4) Previous Monthly Extension Rate 0.72%
------------
(5) Second previous Monthly Extension Rate 0.33%
------------
(6) Average Extension Rate (3)+(4)+(5)
divided by 3 0.83%
------------
(7) Compliance (Extension Test Failure is an
Extension Rate equal to or greater than 4%.) yes
------------
IV. DELINQUENCY:
A. Receivables with Scheduled Payment delinquent
(1) 31-60 days # 3,803 $52,238,504 6.41%
------------------------------------------
(2) 61-90 days 961 13,430,322 1.65%
------------------------------------------
(3) over 90 days 271 3,778,296 0.46%
------------------------------------------
Receivables with Scheduled Payment delinquent
more than 30 days at end of period 5,035 $69,447,122 8.52%
==========================================
</TABLE>
By: /s/ Preston A. Miller
----------------------------------------
Name: Preston A. Miller
----------------------------------------
Title: Executive Vice President and Treasurer
----------------------------------------
Date: June 2, 2000
----------------------------------------
2