TRANSAMERICAN ENERGY CORP
8-K, 1999-02-23
PETROLEUM REFINING
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                    FORM 8-K


                             CURRENT REPORT PURSUANT
                          TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of Earliest Event Reported):             February 23, 1999


                        TRANSAMERICAN ENERGY CORPORATION
                        --------------------------------
             (Exact name of registrant as specified in its charter)


                                    DELAWARE
                                    --------
                 (State or other jurisdiction of incorporation)


              33-85930                                    76-0441642
              --------                                    ----------
      (Commission File Number)                         (I.R.S. Employer
                                                      Identification No.)


                 1300 North Sam Houston Parkway East, Suite 200
                              Houston, Texas 77032
                              --------------------
          (Address of principal executive offices, including zip code)


                                 (281) 986-8822
                                 --------------
              (Registrant's telephone number, including area code)



<PAGE>   2



ITEM 1.            CHANGES IN CONTROL OF REGISTRANT.

                   Not applicable.

ITEM 2.            ACQUISITION OR DISPOSITION OF ASSETS.

                   Not Applicable.

ITEM 3.            BANKRUPTCY OR RECEIVERSHIP.

                   Not applicable.

ITEM 4.            CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT.

                   Not applicable.

ITEM 5.            OTHER EVENTS.

                   Not applicable.

ITEM 6.            RESIGNATIONS OF REGISTRANT'S DIRECTORS.

                   Not applicable.

ITEM 7.            FINANCIAL STATEMENTS AND EXHIBITS.

                   (a)     Financial statements of businesses acquired:

                           Not applicable.

                   (b)     Pro forma financial information:

                           Not applicable.

                   (c)     Exhibits:

                           4.1--     Second Supplemental Indenture dated
                                     November 13, 1998 between TransAmerican
                                     Energy Corporation ("TEC") and Firstar Bank
                                     of Minnesota, N.A.

                           4.2--     Third Supplemental Indenture dated 
                                     December 15, 1998 between TEC and Firstar
                                     Bank of Minnesota, N.A.

                           4.3--     Second Amendment dated December 15, 1998
                                     to Loan Agreement between TEC and
                                     TransTexas Gas Corporation ("TTG").

                           4.4--     First Amendment dated December 15, 1998 to
                                     Security and Pledge Agreement between TTG
                                     and TEC.



                                        2

<PAGE>   3



ITEM 8.            CHANGE IN FISCAL YEAR.

                   Not applicable.

ITEM 9.            SALES OF EQUITY SECURITIES PURSUANT TO REGULATION S.

                   Not applicable.

                                        3

<PAGE>   4



                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                             TRANSAMERICAN ENERGY CORPORATION


                                             By:         /s/ Ed Donahue     
                                                -------------------------------
                                             Name:     Ed Donahue
                                             Title:    Vice President


Dated: February 23, 1999






                                        4

<PAGE>   5


                                    EXHIBITS


<TABLE>
<CAPTION>
Exhibit
  No.                              Description                                                Page
- -------                            -----------                                                ----

<S>        <C>                                                                               <C>         
4.1--      Second Supplemental Indenture dated November 13, 1998 between
           TransAmerican Energy Corporation ("TEC") and Firstar Bank of
           Minnesota, N.A.

4.2--      Third Supplemental Indenture dated December 15, 1998 between TEC 
           and Firstar Bank of Minnesota, N.A.

4.3--      Second Amendment dated December 15, 1998 to Loan Agreement between
           TEC and TransTexas Gas Corporation ("TTG").

4.4--      First Amendment dated December 15, 1998 to Security and Pledge
           Agreement between TTG and TEC.
</TABLE>


                                        5


<PAGE>   1
                                                                    EXHIBIT 4.1

- --------------------------------------------------------------------------------







                        TRANSAMERICAN ENERGY CORPORATION,

                                   as Issuer,



                                       and



                        FIRSTAR BANK OF MINNESOTA, N.A.,

                                   as Trustee



                            ------------------------

                          SECOND SUPPLEMENTAL INDENTURE

                        Effective as of November 13, 1998

                           --------------------------



               $475,000,000 11 1/2% Senior Secured Notes due 2002

                                       and

            $1,130,000,000 13% Senior Secured Discount Notes due 2002

- --------------------------------------------------------------------------------



<PAGE>   2




                          SECOND SUPPLEMENTAL INDENTURE


         THIS SECOND SUPPLEMENTAL INDENTURE, effective as of November 13, 1998
(the "Supplemental Indenture"), is made and entered into by and among
TRANSAMERICAN ENERGY CORPORATION, a Delaware corporation (the "Company"), and
FIRSTAR BANK OF MINNESOTA, N.A. (the "Trustee"), under an Indenture dated as of
June 13, 1997, by and between the Company and the Trustee, as amended and
supplemented by a First Supplemental Indenture dated as of December 30, 1997
(the "Original Indenture"). All capitalized terms used in this Supplemental
Indenture that are defined in the Original Indenture, either directly or by
reference therein, have the respective meanings assigned to them therein, except
to the extent such terms are otherwise defined in this Supplemental Indenture or
the context clearly requires otherwise.

         WHEREAS, Section 9.2 of the Original Indenture provides, among other
things, that, with the consent of the Holders of not less than a majority in
aggregate Value of then outstanding Notes or, with respect to certain matters,
not less than 66-2/3% in aggregate Value of the Notes at the time outstanding,
the Company, when authorized by Board Resolutions, and the Trustee may amend or
supplement the Original Indenture or the Security Documents or enter into an
indenture supplemental thereto for the purposes of adding any provisions to or
changing in any manner or eliminating any of the provisions of the Original
Indenture or the Security Documents or of modifying in any manner the rights of
the Holders under the Original Indenture or the Notes; and

         WHEREAS, the Company has solicited consents from the Holders of the
Notes (the "Consent Solicitation") to amendments (the "Proposed Amendments") and
waivers (the "Proposed Waivers") to (i) the Original Indenture, and (ii) the
Loan Agreement dated June 13, 1997, as amended, between the Company and TARC;
and

         WHEREAS, the Holders of at least 66-2/3% in aggregate Value of Notes at
the time outstanding have consented to the Proposed Amendments and Proposed
Waivers pursuant to the Consent Solicitation; and

         WHEREAS, the Board of Directors of the Company has adopted resolutions
authorizing and approving the Proposed Amendments and the Company and the
Trustee are executing and delivering this Supplemental Indenture in order to
provide for such amendments;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties to this Supplemental
Indenture hereby agree as follows:

                                       -2-

<PAGE>   3


                                    ARTICLE I
                        AMENDMENTS TO ORIGINAL INDENTURE

         Section 1.01. Amended Definitions. The following definitions in Section
1.1 of the Original Indenture are hereby amended as follows:

         (a)     A definition of "Bridge Financing Transaction" is hereby added
to read in its entirety as follows:

                         "Bridge Financing Transaction" means a series of
                 related transactions (as more fully described in the Company's
                 Consent Solicitation Statement dated November 4, 1998 pursuant
                 to which consents were solicited from the Holders to amendments
                 to the Indenture to facilitate the Bridge Financing
                 Transaction, which description is incorporated herein by
                 reference) pursuant to which, among other things (i) the
                 Company issues the Bridge Loan Notes, (ii) the Company loans
                 the proceeds of the issuance of the Bridge Loan Notes to TARC,
                 (iii) the liens on deposit accounts of the Company and the TARC
                 Intercompany Bridge Loan securing the Notes are released and
                 (iv) the liens on the remainder of the TEC Collateral securing
                 the Notes are subordinated to the liens thereon securing the
                 Bridge Loan Notes.


         (b)     A definition of "Bridge Loan Notes" is hereby added to read in
its entirety as follows:

                         "Bridge Loan Notes" means promissory notes issued by
                 the Company pursuant to the Bridge Financing Transaction (which
                 may be issued with original issue discount) resulting in
                 proceeds to the Company not in excess of $25,000,000.


         (c)     The definition of "Excess Cash" is hereby amended to read in
its entirety as follows:

                         "Excess Cash" means the Net Cash Proceeds received by
                 the Company from Asset Sales by the Company and the aggregate
                 amount of cash and Cash Equivalents received by the Company
                 from its Subsidiaries, including from dividends or payments in
                 respect of Intercompany Loan Redemptions less the sum (without
                 duplication) of (a) the provision for income and other taxes of
                 the Company or, in the case of subclause (iii) of this clause
                 (a), TransAmerican, (i) for the current fiscal year, (ii) for
                 the immediately preceding fiscal year or (iii) relating to the
                 sale by TransTexas of the Capital Stock of TransTexas
                 Transmission Corporation, (b) without duplication, amounts
                 received pursuant to the Services Agreement, (c) amounts used
                 to pay consent fees in connection with a solicitation of
                 waivers or amendments to the Notes, (d) dividends received from
                 an Accounts Receivable Subsidiary; provided, that such funds
                 are then contributed to TARC, (e) payments of interest and
                 principal on loans by the Company to TARC or TransTexas which
                 loans are permitted by the terms of the Indenture, (f)
                 scheduled payments of interest and principal pursuant to the
                 terms of the Intercompany Loans and (g) amounts used to pay
                 interest, principal and premium on the Bridge Loan Notes.

                                       -3-

<PAGE>   4




         (d)     The definition of "First Lien Debt" is hereby amended to read
in its entirety as follows:

                         "First Lien Debt" means any Debt or other obligation
                 secured by a Permitted TransTexas Lien described in clause (c),
                 (d), (e), (f), (i), (k), (l), (o), (q), (r) to the extent that
                 the Incurrence of the Permitted Lien to which such clause
                 relates is one of the other clauses listed here, (s) or (t) of
                 the definition of "Permitted TransTexas Liens," a Permitted
                 TARC Lien described in clause (c), (d), (g), (j), (k), (m),
                 (o), (p), (q), (r) to the extent that the Incurrence of the
                 Permitted Lien to which such clause relates is one of the other
                 clauses listed here, (s), (t), (y) and (z) of the definition of
                 "Permitted TARC Liens," or a Permitted TEC Lien described under
                 clause (g) or (h) of Permitted TEC Liens including, in each
                 case, any refinancings thereof.


         (e)     The definition of "Intercreditor Agreements" is hereby amended
to read in its entirety as follows:

                         "Intercreditor Agreements" means the TARC Intercreditor
                 Agreement, the TransTexas Intercreditor Agreement and the
                 intercreditor agreements permitted by Section 12.2(d).

         (f)     The definition of "Permitted Investment" is hereby amended to
read in its entirety as follows:

                         "Permitted Investment" means, when used with reference
                 to the Company or its Subsidiaries, (i) trade credit extended
                 to persons in the ordinary course of business; (ii) purchases
                 of Cash Equivalents; (iii) Investments by TransTexas or its
                 wholly owned Subsidiaries in wholly owned Subsidiaries of
                 TransTexas (other than TTXD) that are engaged in Related
                 TransTexas Businesses and Investments by TARC or its wholly
                 owned Subsidiaries in wholly owned Subsidiaries of TARC that
                 are engaged in Related TARC Businesses; (iv) Swap Obligations;
                 (v) the receipt of capital stock in lieu of cash in connection
                 with the settlement of litigation; (vi) advances to officers
                 and employees in connection with the performance of their
                 duties in the ordinary course of business in an amount not to
                 exceed $3,000,000 in the aggregate outstanding at any time in
                 the case of each of (i) the TARC Entities and (ii) the
                 TransTexas Entities; (vii) margin deposits in connection with
                 Permitted Hedging Transactions; (viii) an Investment in one or
                 more Unrestricted Subsidiaries of (a) TransTexas in an
                 aggregate amount, net of return on such Investment, not in
                 excess of $25,000,000 less the amount of any Unrestricted
                 Non-Recourse Debt outstanding of TransTexas or any of its
                 Subsidiaries and (b) TARC of the assets comprising the
                 CATOFIN(R) Unit owned by TARC as of the date hereof; (ix)
                 Investments and expenditures made in the ordinary course of
                 business by TransTexas or its Subsidiaries, and of a nature
                 that is or shall have become customary in, the oil and gas
                 business as a means of actively exploiting, exploring for,
                 acquiring, developing, processing, gathering, marketing or
                 transporting oil or gas through agreements, transactions,
                 interests or arrangements which permit a person to share risks
                 or costs, comply with regulatory requirements regarding local
                 ownership or satisfy other objectives customarily achieved
                 through the conduct of the oil and gas business jointly with
                 third parties, including, without limitation, (a) ownership
                 interests in oil and gas properties or gathering systems and
                 (b) Investments and expenditures in the form of or pursuant to
                 operating agreements,

                                      -4-

<PAGE>   5

                 processing agreements, farm-in agreements, farm-out agreements,
                 development agreements, area of mutual interest agreements,
                 unitization agreements, pooling arrangements, joint bidding
                 agreements, service contracts, joint venture agreements,
                 partnership agreements (whether general or limited),
                 subscription agreements, stock purchase agreements and other
                 similar agreements with third parties (including Unrestricted
                 Subsidiaries); provided, that in the case of any joint venture
                 engaged in processing, gathering, marketing or transporting oil
                 or gas (i) all Debt of such joint venture (other than a joint
                 venture that is an Unrestricted Subsidiary) that would not
                 otherwise constitute Debt of one of the TransTexas Entities
                 shall be deemed Debt of TransTexas in proportion to its direct
                 or indirect ownership interest in such joint venture and (ii)
                 such joint venture shall be reasonably calculated to enhance
                 the value of the reserves of the TransTexas Entities or
                 marketability of production from such reserves; (x) a guaranty
                 by any Subsidiary of the Company permitted under Section 4.11;
                 (xi) deposits permitted by the definition of Permitted Liens or
                 any extension, renewal, or replacement of any of them, (xii)
                 the TTXD Equity Investment (in addition to any contribution by
                 TransTexas pursuant to clause (xiii) below), (xiii) capital
                 contributions by TransTexas to TTXD or to a joint venture, a
                 partnership, a limited liability company or a similar entity of
                 TransTexas' drilling and energy services business and pipeline
                 services business and related assets, (xiv) any acquisition by
                 TARC of tank storage facilities (or the company that owns such
                 facilities) in the vicinity of the TARC refinery, (xv)
                 guarantees by TransTexas of Debt of TTXD to the extent that
                 such Debt relates to assets contributed to TTXD pursuant to
                 clause (xiii) hereof, (xvi) Investments in Accounts Receivables
                 Notes by TARC in amounts not to exceed the greater of
                 $20,000,000 or 20% of the TARC Borrowing Base at any one time,
                 (xvii) loans from the Company to its Subsidiaries (other than
                 the TTXD Entities prior to the TTXD Spin-off) with (i) the
                 excess of the Excess Cash Offer Amount (after reserving the
                 full Interest Reserve Amount) over the Excess Cash Acceptance
                 Amount, provided, that such loans are on terms no less
                 favorable to the Company than were disclosed to the Holders of
                 the Notes in the Excess Cash Offer or (ii) the excess of the
                 Additional Interest Excess Cash Offer Amount over the
                 Additional Interest Excess Cash Acceptance Amount, provided,
                 that such loans are on terms no less favorable to the Company
                 than were disclosed to the Holders of the Notes in the
                 Additional Interest Excess Cash Offer, (xviii) an Investment in
                 Capital Stock resulting from an Asset Sale pursuant to clause
                 (xiii) of Section 4.14, (xix) Investments by the Company in an
                 Accounts Receivable Subsidiary, or by the Company or TARC in a
                 reincorporation subsidiary in each case in connection with the
                 initial capitalization thereof and not to exceed $1,000, (xx)
                 Investments by the Company or TARC or a wholly owned Subsidiary
                 of either of them solely for the purpose of facilitating a
                 repurchase of the TARC Warrants in connection with a merger,
                 (xxi) other Investments not in excess of $5,000,000 at any time
                 outstanding, (xxii) loans made (X) to officers, directors and
                 employees of the Company or any of its Subsidiaries approved by
                 the applicable Board of Directors (or by an authorized
                 officer), the proceeds of which are used solely to purchase
                 stock or to exercise stock options received pursuant to an
                 employee stock option plan or other incentive plan, in a
                 principal amount not to exceed the purchase price of such stock
                 or the exercise price of such stock options, as applicable and
                 (Y) to refinance loans, together with accrued interest thereon,
                 made pursuant to this clause, in each case not in excess of
                 $3,000,000 in the aggregate outstanding at any one time,
                 (xxiii) Investments by the Company in its Subsidiaries in an
                 aggregate amount not to exceed the proceeds of Subordinated
                 Debt permitted to be incurred pursuant to clause (5)(d) of
                 Section 4.11, (xxiv) Investments by the Company in TARC in an

                                      -5-

<PAGE>   6
                 amount not to exceed the amounts received by the Company from
                 an Accounts Receivable Subsidiary, (xxv) a capital contribution
                 by TTXD of any or all of its assets to a joint venture, a
                 partnership, a limited liability company or a similar entity,
                 (xxvi) a capital contribution by the Company to TARC in an
                 amount not to exceed $226,000,000 (inclusive of any equity
                 contribution made as described in the Offering Circular under
                 the heading "The Transactions -- TARC Equity Contribution"),
                 (xxvii) any deposit or escrow of funds in connection with
                 adjustments to the Lobo Sale purchase price, (xxviii) loans
                 made by the Company to TransTexas or TARC which in the
                 aggregate do not exceed $50,000,000 principal amount
                 outstanding at any one time or (xxix) loans from the Company to
                 TARC of an amount equal to the proceeds received by it from the
                 issuance of the Bridge Loan Notes.


         (g)     The definition of "Permitted TARC Liens" is hereby amended to
read in its entirety as follows:

                         "Permitted TARC Liens" means (a) Liens imposed by
                 governmental authorities for taxes, assessments, or other
                 charges not yet due or which are being contested in good faith
                 and by appropriate proceedings, if adequate reserves with
                 respect thereto are maintained on the books of any of the TARC
                 Entities in accordance with GAAP; (b) statutory Liens of
                 landlords, carriers, warehousemen, mechanics, materialmen,
                 repairmen, mineral interest owners, or other like Liens arising
                 by operation of law in the ordinary course of business provided
                 that (i) the underlying obligations are not overdue for a
                 period of more than 60 days, or (ii) such Liens are being
                 contested in good faith and by appropriate proceedings and
                 adequate reserves with respect thereto are maintained on the
                 books of any of the TARC Entities in accordance with GAAP; (c)
                 deposits of cash or Cash Equivalents to secure (i) the
                 performance of bids, trade contracts (other than borrowed
                 money), leases, statutory obligations, surety bonds,
                 performance bonds, and other obligations of a like nature
                 incurred in the ordinary course of business (or to secure
                 reimbursement obligations or letters of credit issued to secure
                 such performance or other obligations) in an aggregate amount
                 outstanding at any one time not in excess of $5,000,000 or (ii)
                 appeal or supersedeas bonds (or to secure reimbursement
                 obligations or letters of credit in support of such bonds); (d)
                 easements, servitudes, rights-of-way, zoning, similar
                 restrictions and other similar encumbrances or title defects
                 incurred in the ordinary course of business which, in the
                 aggregate, are not material in amount and which do not, in any
                 case, materially detract from the value of the property subject
                 thereto (as such property is used by any of the TARC Entities)
                 or materially interfere with the ordinary conduct of the
                 business of any of the TARC Entities including, without
                 limitation, any easement or servitude granted in connection
                 with the Port Commission Bond Financing; (e) Liens arising by
                 operation of law in connection with judgments, only to the
                 extent, for an amount and for a period not resulting in an
                 Event of Default with respect thereto; (f) Liens securing Debt
                 or other obligations not in excess of $3,000,000; (g) pledges
                 or deposits made in the ordinary course of business in
                 connection with worker's compensation, unemployment insurance,
                 other types of social security legislation, property insurance
                 and liability insurance; (h) Liens on Equipment, Receivables
                 and Inventory; (i) Liens on the assets of any entity existing
                 at the time such assets are acquired by any of the TARC
                 Entities, whether by merger, consolidation, purchase of assets
                 or otherwise so long as such Liens (i) are not

                                      -6-

<PAGE>   7

                 created, incurred or assumed in contemplation of such assets
                 being acquired by any of the TARC Entities and (ii) do not
                 extend to any other assets of any of the TARC Entities; (j)
                 Liens (including extensions and renewals thereof) on real or
                 personal property, acquired after the Issue Date ("New TARC
                 Property"); provided, however, that (i) such Lien is created
                 solely for the purpose of securing Debt Incurred to finance the
                 cost (including the cost of improvement or construction) of the
                 item of New TARC Property subject thereto and such Lien is
                 created at the time of or within six months after the later of
                 the acquisition, the completion of construction, or the
                 commencement of full operation of such New TARC Property, (ii)
                 the principal amount of the Debt secured by such Lien does not
                 exceed 100% of such cost plus reasonable financing fees and
                 other associated reasonable out-of-pocket expenses (iii) any
                 such Lien shall not extend to or cover any property or assets
                 other than such item of New TARC Property and any improvements
                 on such New TARC Property and (iv) such Lien does not extend to
                 assets or property which are part of the fixed refinery assets
                 which are part of the Capital Improvement Program; (k) leases
                 or subleases granted to others that do not materially interfere
                 with the ordinary course of business of any of the TARC
                 Entities, taken as a whole; (l) Liens on the assets of one of
                 the TARC Entities in favor of another TARC Entity; (m) Liens
                 securing reimbursement obligations with respect to letters of
                 credit that encumber documents relating to such letters of
                 credit and the products and proceeds thereof; provided, that,
                 such reimbursement obligations are not matured for a period of
                 over 60 days; (n) Liens in favor of customs and revenue
                 authorities arising as a matter of law to secure payment of
                 customs duties in connection with the importation of goods; (o)
                 Liens encumbering customary initial deposits and margin
                 deposits securing Swap Obligations or Permitted Hedging
                 Transactions; (p) Liens on cash deposits to secure
                 reimbursement obligations with respect to letters of credit
                 after the Delayed Coking Unit is completed; (q) Liens that
                 secure Unrestricted Non-Recourse Debt; provided, however, that
                 at the time of incurrence the aggregate fair market value of
                 the assets securing such Lien (exclusive of the stock of the
                 applicable Unrestricted Subsidiary) shall not exceed the amount
                 of allowed Unrestricted Non-Recourse Debt of TARC; (r) Liens on
                 the proceeds of any property subject to a Permitted TARC Lien
                 or on deposit accounts containing any such proceeds; (s) Liens
                 on the proceeds of any property that is not Collateral, on the
                 proceeds of any Debt Incurred in accordance with the provisions
                 hereof, or on deposit accounts containing any such proceeds;
                 (t) Liens imposed in connection with the Port Commission Bond
                 Financing; provided, that such liens do not extend to property
                 other than the Port Facility Assets; (u) any extension, renewal
                 or replacement of the Liens created pursuant to any of clauses
                 (a) through (g), (i) through (t) or (w) provided that such
                 Liens would have otherwise been permitted under such clauses,
                 and provided further that the Liens permitted by this clause
                 (u) do not secure any additional Debt or encumber any
                 additional property; (v) Liens of the trustee under indenture
                 and related collateral documents governing the terms of the
                 Senior TARC Mortgage Notes and the Senior TARC Discount Notes;
                 (w) Liens in favor of the Company or its assignee under the
                 Security Documents; (y) Liens on tank storage facilities in the
                 vicinity of the TARC refinery acquired after the date hereof
                 and (z) Liens securing the TARC Intercompany Bridge Loan.

         (h)     The definition of "Permitted TEC Liens" is hereby amended to
read in its entirety as follows:

                                      -7-

<PAGE>   8

                         "Permitted TEC Liens" means (a) Liens imposed by
                 governmental authorities for taxes, assessments, or other
                 charges not yet due or which are being contested in good faith
                 and by appropriate proceedings, if adequate reserves with
                 respect thereto are maintained on the books of any of the
                 Company in accordance with GAAP; (b) Liens arising by operation
                 of law in connection with judgments, only to the extent, for an
                 amount and for a period not resulting in an Event of Default
                 with respect thereto; (c) any extension, renewal, or
                 replacement of Liens created pursuant to either of clauses (a)
                 or (b) of this definition, provided that such Liens would have
                 otherwise been permitted under such clauses, and further
                 provided that the Liens permitted by this clause (c) shall not
                 be spread to cover any additional Debt or property; (d) Liens
                 of the trustee under this Indenture and related collateral
                 documents governing the terms of the Senior TARC Mortgage Notes
                 and the Senior TARC Discount Notes; (e) deposits of cash or
                 Cash Equivalents to secure appeal or supersedeas bonds (or to
                 secure reimbursement obligations or letters of credit in
                 support of such bonds), (f) pledges or deposits made in the
                 ordinary course of business in connection with worker's
                 compensation, unemployment insurance, and other types of social
                 security legislation, property insurance and liability
                 insurance, (g) a Lien on the stock of an Accounts Receivable
                 Subsidiary securing a guaranty of the Debt of an Accounts
                 Receivable Subsidiary described in the definition of
                 Unrestricted Non-Recourse Debt or (h) Liens securing the Bridge
                 Loan Notes.

         (i)     A definition of "TARC Intercompany Bridge Loan" is hereby added
to read in its entirety as follows:

                         "TARC Intercompany Bridge Loan" means the promissory
                 note from TARC to the Company which is issued pursuant to the
                 Bridge Financing Transaction resulting in proceeds of up to
                 $25,000,000 to TARC.


         (j)     A definition of "TEC Collateral" is hereby added to read in its
entirety as follows:

                         "TEC Collateral" means the assets of the Company which
                 are pledged to the Trustee as security for the Notes.


         Section 1.02. Section 4.10 of the Original Indenture.

         (a)     Section 4.10(a) of the Original Indenture is hereby amended to
read in its entirety as follows:

                         (a) The Company shall not, and shall not permit any of
                 its Subsidiaries (other than any of the TTXD Entities after the
                 date of the TTXD Spin-off) to, enter directly or indirectly
                 into, or permit to exist, any transaction or series of related
                 transactions with any Related Person (excluding any Related
                 Person which is a Related Person solely because the party
                 engaging in such transaction has the ability to control the
                 Related Person under the definition of "Control" contained
                 within the definition of "Related Person") (including, without
                 limitation: (i) the sale, lease, transfer or other disposition
                 of properties, assets or securities to such Related Person,
                 (ii) the purchase or lease of any property, assets or
                 securities from such Related Person, (iii) an Investment in
                 such Related Person (excluding

                                      -8-

<PAGE>   9

                 Investments permitted to be made pursuant to clauses (iii),
                 (vi), (viii), (x), (xii), (xiii), (xv), (xvi), (xvii), (xix),
                 (xx), (xxii), (xxiii), (xxiv) or (xxvi) of the definition of
                 "Permitted Investment"), and (iv) entering into or amending any
                 contract or agreement with or for the benefit of a Related
                 Person (each, a "Related Person Transaction")), except for (A)
                 permitted Restricted Payments, including for this purpose the
                 transactions excluded from the definition of Restricted
                 Payments by the proviso contained in the definition of
                 "Restricted Payments", (B) transactions made in good faith, the
                 terms of which are (x) fair and reasonable to the Company or
                 such Subsidiary, as the case may be, and (y) at least as
                 favorable as the terms which could be obtained by the Company
                 or such Subsidiary, as the case may be, in a comparable
                 transaction made on an arm's length basis with Persons who are
                 not Related Persons, (C) transactions (w) between the Company
                 and any of its Wholly Owned Subsidiaries or transactions
                 between Wholly Owned Subsidiaries of the Company, (x) among the
                 TTXD Entities, (y) among the TARC Entities, or (z) among the
                 TransTexas Entities, (D) transactions pursuant to the Services
                 Agreement, the Transfer Agreement, the Tax Allocation
                 Agreement, the Gas Purchase Agreement, the Drilling Agreement,
                 the Intercompany Notes, the Security Documents, and the
                 Registration Rights Agreements (E) the lease of office space to
                 the Company or an Affiliate of the Company by TransAmerican or
                 an Affiliate of TransAmerican, provided that payments
                 thereunder do not exceed in the aggregate $2,000,000 per year,
                 (F) any sale and leaseback or other transfer of TransTexas'
                 headquarters building located at 1300 North Sam Houston Parkway
                 East, Houston, Texas, (G) any employee compensation arrangement
                 in an amount which together with the amount of all other cash
                 compensation paid to such employee by the Company and its
                 Subsidiaries does not provide for cash compensation in excess
                 of $2,000,000 in any fiscal year of the Company or any
                 Subsidiary and which has been approved by a majority of the
                 Company's Independent Directors and found in good faith by such
                 directors to be in the best interests of the Company or such
                 Subsidiary, as the case may be, (H) loans to TARC and
                 TransTexas which are permitted to be Incurred pursuant to the
                 terms of Section 4.11; (I) the amounts payable by the Company
                 and its Subsidiaries to Southeast Contractors for employee
                 services provided to TARC not exceeding the actual costs to
                 Southeast Contractors of the employees, which costs consist
                 solely of payroll and employee benefits, plus related
                 administrative costs and an administrative fee, not exceeding
                 $2,000,000 per year in the aggregate; (J) the Company and its
                 Subsidiaries may pay a management fee to TransAmerican in an
                 amount not to exceed $2,500,000 per year and (K) transactions
                 effected pursuant to the Bridge Financing Transaction,
                 including without limitation (w) the borrowing by TARC from the
                 Company of up to $25 million on substantially the same terms as
                 the Bridge Loan Notes, (x) the repayment thereof, (y) the
                 pledge of the TARC Collateral as security therefor and (z) the
                 execution, delivery and performance of an agreement pursuant to
                 which the Company would direct TransTexas to make payments on
                 the TransTexas Intercompany Loan, during the period that the
                 Bridge Loan Notes remain outstanding, to an account which will
                 be dedicated to payments on the Bridge Loan Notes.

                         Notwithstanding the foregoing, the Company shall not,
                 and shall not permit any of its Subsidiaries to, directly or
                 indirectly (excluding clauses (I) and (J) of Section 4.10(a)),
                 loan or advance any funds to John R. Stanley, and the aggregate
                 amount of total compensation to John R. Stanley shall not
                 exceed (i) $1,000,000 per year in the aggregate from the
                 Company and TransTexas and (ii) following the Phase II
                 Completion Date, $1,000,000 from TARC.

                                     -9-

<PAGE>   10


         (b)     Section 4.10(b) of the Original Indenture is hereby amended to
read in its entirety as follows:

                         (b) Without limiting the foregoing, except for sales of
                 accounts receivable to an Accounts Receivable Subsidiary in
                 accordance with Section 4.20, (i) with respect to any Related
                 Person Transaction or series of Related Person Transactions
                 (other than any Related Person Transaction described in clause
                 (A) (with respect to Permitted Restricted Payments by virtue of
                 clauses (i), (ii), (iv)-(xii), (xiv), (xv), (xvi) and (xvii) of
                 the proviso contained in the definition of "Restricted
                 Payments"), (C), (D), (E), (F), (H) or (K) of Section 4.10(a))
                 with an aggregate value in excess of $1,000,000, such
                 transaction must first be approved by a majority of the Board
                 of Directors of the Company or its Subsidiary which is the
                 transacting party and a majority of the directors of such
                 entity who are disinterested in the transaction pursuant to a
                 Board Resolution, as (x) fair and reasonable to the Company or
                 such Subsidiary, as the case may be, and (y) on terms which are
                 at least as favorable as the terms which could be obtained by
                 the Company or such Subsidiary, as the case may be, on an arm's
                 length basis with Persons who are not Related Persons, and (ii)
                 with respect to any Related Person Transaction or series of
                 related Person Transactions (other than any Related Person
                 Transaction described in clause (A) (with respect to permitted
                 Restricted Payments by virtue of clauses (i), (ii), (iv)-(xii),
                 (xiv), (xv), (xvi) and (xvii) of the proviso contained in the
                 definition of "Restricted Payments") (C), (D), (E), (F), (G),
                 (H) or (K) of Section 4.10(a)) with an aggregate value in
                 excess of $5,000,000, the Company must first obtain a favorable
                 written opinion as to the fairness of such transaction to the
                 Company or such Subsidiary, as the case may be, from a
                 financial point of view, from a "big 6 accounting firm" or a
                 nationally recognized investment banking firm; provided that
                 such opinion shall not be necessary if approval of the Board of
                 Directors to such Related Person Transaction has been obtained
                 after receipt of bona fide bids of at least two other
                 independent parties and such Related Person Transaction is in
                 the ordinary course of business.

         Section 1.03. Section 4.11 of the Original Indenture.

         (a)     Section 4.11(2) is hereby amended to add subsection (s) thereto
to read in its entirety as follows:

                         (s) Debt of TARC to the Company evidenced by the TARC
                 Intercompany Bridge Loan.

         (b)     Section 4.11(5) is hereby amended to add subsection (f) thereto
to read in its entirety as follows:

                         (f) Debt evidenced by the Bridge Loan Notes.

         Section 1.04. Section 4.14 of the Original Indenture. Section 4.14(b)
is hereby amended to read in it entirety as follows:

                         (b) Notwithstanding the foregoing limitations on Asset
                 Sales and restrictions on the use of Net Cash Proceeds
                 therefrom:

                                      -10-

<PAGE>   11

                         (i)    TransTexas or any Subsidiary of TransTexas may
                 convey, sell, lease, transfer, or otherwise dispose of any or
                 all of its assets (upon voluntary liquidation or otherwise) to
                 TransTexas or a wholly owned Subsidiary of TransTexas;

                         (ii)   TARC or any Subsidiary of TARC may convey, sell,
                 lease, transfer, or otherwise dispose of any or all of its
                 assets (upon voluntary liquidation or otherwise) to TARC or any
                 wholly owned Subsidiary of TARC;

                         (iii)  the Company and its Subsidiaries may engage in
                 Asset Sales in the ordinary course of business;

                         (iv)   the Company and its Subsidiaries may engage in
                 Asset Sales not otherwise permitted in clauses (i) through
                 (iii) or (v) through (xiii) of this sentence provided that the
                 aggregate proceeds from all such Asset Sales do not exceed
                 $5,000,000 in any twelve-month period;

                         (v)    the Company and its Subsidiaries may engage in
                 Asset Sales pursuant to and in accordance with the provisions
                 of Article V;

                         (vi)   the Company and its Subsidiaries may sell,
                 assign, lease, license, transfer, abandon or otherwise dispose
                 of (a) damaged, worn out, unserviceable or other obsolete
                 property in the ordinary course of business or (b) other
                 property no longer necessary for the proper conduct of their
                 business;

                         (vii)  TARC and its Subsidiaries may sell accounts
                 receivable to an Accounts Receivable Subsidiary in accordance
                 with the provisions described under Section 4.20;

                         (viii) TARC and its Subsidiaries may convey, sell,
                 transfer or otherwise dispose of crude oil and refined products
                 in the ordinary course of business;

                         (ix)   the Company and its Subsidiaries may engage in
                 Asset Sales (a) the Net Cash Proceeds of which are used for
                 payment of cash interest on the Notes or the Intercompany
                 Loans, (b) in connection with the settlement of litigation or
                 the payment of judgments or (c) the Net Cash Proceeds of which
                 are used in connection with the settlement of litigation or for
                 the payment of judgments; provided, that the aggregate value of
                 assets transferred pursuant to clauses (b) and (c) above from
                 and after the Issue Date does not exceed $25,000,000;

                         (x)    TransTexas may sell, convey, contribute or
                 otherwise transfer the assets comprising the Related TTXD
                 Business to TTXD;

                         (xi)   TARC may transfer the Port Facility Assets in
                 connection with the Port Commission Bond Financing;

                                      -11-

<PAGE>   12

                         (xii)  TransTexas and its Subsidiaries may convey,
                 sell, transfer or otherwise dispose of Hydrocarbons or other
                 mineral products in the ordinary course of business;

                         (xiii) Prior to the TTXD Spin-off, TransTexas may sell,
                 transfer, contribute or otherwise dispose of the capital stock
                 of TTXD or the assets comprising the drilling and energy
                 services business and pipeline services business of TransTexas
                 provided that (a) in the case of a transfer, contribution or
                 other distribution to a company which has a class of equity
                 securities publicly traded on a national securities exchange or
                 on the NNM, (x) at least 50% of the value of the consideration
                 for such Asset Sale consists of cash and up to 50% of the value
                 of the consideration for such Asset Sale may consist of Capital
                 Stock and (y) the Net Cash Proceeds from such Asset Sale are
                 applied pursuant to clause (a)(ii) of the prior paragraph or
                 (b) in the case of a transfer, contribution or other
                 distribution to a joint venture, partnership, limited liability
                 company or similar entity newly formed for the purpose of this
                 transfer, up to 100% of the value of the consideration for such
                 Asset Sale may consist of Capital Stock or other equity
                 interests in such entity; provided, that any Net Cash Proceeds
                 from such Asset Sale are applied pursuant to clause (a)(ii) of
                 the prior paragraph;

                         (xiv)  The Company and TARC may sell shares of
                 TransTexas Common Stock in connection with a transaction
                 contemplated by the TransTexas Disbursement Agreement and
                 clause (xii) of the definition of "Restricted Payments;"

                         (xv)   The Company may transfer all or any portion of
                 its voting rights with respect to Capital Stock of TransTexas
                 pursuant to the Bridge Financing Transaction; and

                         (xvi)  Unless otherwise required by the foregoing
                 clauses (i) through (xv), the proceeds of any Asset Sale
                 permitted thereby shall be used by the Company or its
                 Subsidiaries for purposes not otherwise prohibited by this
                 Indenture.

         Section 1.05. Section 12.2 of the Original Indenture. Section 12.2 is
hereby amended to add subsection (d) thereto to read in its entirety as follows:

                         (d) The Trustee, upon the Company's request and at the
                 Company's expense, will execute, deliver, file and record all
                 instruments and do all acts and other things as may be
                 reasonably necessary to provide, pursuant to one or more
                 subordination, intercreditor and collateral agency agreements
                 (the "Subordination Agreements") among the Trustee, the initial
                 holders of the Bridge Loan Notes, the Company and a collateral
                 agent, as collateral agent, among other things, (i) that the
                 Liens on the TEC Collateral securing the Notes will be
                 subordinated to the Liens on the TEC Collateral securing the
                 Bridge Loan Notes, (ii) that the Liens on the TARC Collateral
                 securing the TARC Intercompany Loan will be subordinated to the
                 Liens on the TARC Collateral securing the TARC Intercompany
                 Bridge Loan, (iii) that determinations regarding the exercise
                 of remedies against the TEC Collateral securing both the Bridge
                 Loan Notes and the Notes will be made by a majority

                                      -12-

<PAGE>   13

                 of the outstanding principal amount of the Bridge Loan Notes,
                 (iv) that determination regarding the exercise of remedies
                 against the TARC Collateral securing both the TARC Intercompany
                 Bridge Loan and the TARC Intercompany Loan will be made by a
                 majority of the outstanding principal amount of the Bridge Loan
                 Notes, (v) that the collateral agent will act as collateral
                 agent with respect to the TEC Collateral and the TARC
                 Collateral for both the holders of the Bridge Loan Notes and
                 the holders of the Notes and (vi) that all of the Trustee's
                 voting rights with respect to the Capital Stock of TransTexas
                 included within the TEC Collateral shall be transferred to the
                 holders of the Bridge Loan Notes (pro rata based on the
                 principal amount thereof) until the Bridge Loan Notes have been
                 paid in full. The Subordination Agreement will provide that
                 nothing contained therein will impair or affect the right of
                 the holders of the Notes to institute suit for the enforcement
                 of any payment thereon as and when due. The subordination of
                 the Security Interests pursuant to the Subordination Agreement
                 shall be deemed not to impair the Security Interests in
                 contravention of the provisions of this Indenture.


         Section 1.06. Section 12.5 of the Original Indenture. Section 12.5(a)
is hereby amended to read in its entirety as follows:

                         (a)   Upon receipt of a Release Request, the Trustee
                 shall execute and deliver, within five Business Days from the
                 receipt of such Release Request, any instruments deemed by the
                 Company (or with respect to the Security Documents, the grantor
                 of the security interests thereunder) to be reasonably
                 necessary or reasonably appropriate to release all or a part of
                 the Collateral from the Security Interests, if the provisions
                 of this Section 12.5 have been complied with. Any such Release
                 Request shall request the Trustee to execute one or more
                 specifically described release instruments (which release
                 instruments shall accompany such Release Request) and shall
                 certify (i) that no Event of Default has occurred and is
                 continuing (or with respect to a Release Request relating to
                 any of the Security Documents, that no event of default has
                 occurred and is continuing under the applicable Security
                 Document) and (ii) that one of the conditions of this Section
                 12.5(a) set forth below (specifying such condition), and if
                 such specified condition is described in clause (i), (ii) or
                 (iii) below, that the conditions of Section 12.4, 12.6 or 12.7,
                 if applicable, have been, or simultaneously with or immediately
                 following the release will be, fulfilled:

                         (i)   the Collateral will be disposed of in compliance
                 with Section 12.4;

                         (ii)  there is a substitution of Substitute Collateral
                 in accordance with Section 12.6;

                         (iii) there is a deposit of cash in a cash collateral
                 account in accordance with Section 12.7;

                         (iv)  the Collateral to be released will be used within
                 five business days either to make redemptions or purchases of
                 Notes which will be delivered to the Trustee for cancellation;

                         (v)   the Collateral is to be released in connection
                 with an Asset Sale made in compliance with Section 4.14;

                                      -13-

<PAGE>   14

                         (vi)    all of the conditions precedent to the
                 termination of the Security Document under which the Lien in
                 the Collateral to be released was created, or to the release of
                 such Collateral from the Lien created by such Security
                 Document, as set forth in such Security Document, have been
                 satisfied;

                         (vii)   Holders of not less than 66 2/3% in Value of
                 the then outstanding Notes have consented in writing to such
                 release of Collateral from the Security Interests;

                         (viii)  the Collateral is to be released in connection
                 with the TTXD Spin-off;

                         (ix)    the Collateral is to be released in connection
                 with the repurchase by TransTexas of its common stock made
                 pursuant to the terms of clause (xii) of the definition of
                 "Restricted Payments" contained herein; or

                         (x)     the Collateral to be released relates to the
                 lien of the TARC Mortgage on a portion of Parcel B-1 of TARC's
                 refinery (which parcel is more particularly described in
                 Exhibit "A" to the TARC Mortgage) for dedication to a
                 governmental authority (such parcel being referred to as the
                 "Dedicated Parcel") for the purpose of relocating Prospect
                 Avenue from the western boundary line of such Parcel B-1 to the
                 eastern and northern boundary lines of such Parcel B-1,
                 provided that (i) the fee interest in and to the real property
                 currently dedicated for use as Prospect Avenue is conveyed to
                 TARC (such parcel being referred to as the "Reconveyed
                 Parcel"), (ii) TARC executes and delivers a supplemental
                 mortgage evidencing that the lien of the TARC Mortgage
                 encumbers the Reconveyed Parcel, (iii) the Company executes and
                 delivers a supplemental collateral assignment with respect to
                 such supplemental mortgage and (iv) the Company delivers to the
                 Trustee a certificate of the Construction Supervisor certifying
                 that the loss of the use of the Dedicated Parcel does not have
                 a material adverse affect on the use, operation or maintenance
                 of TARC's refinery or the Capital Improvement Program.

                         (xi)    the Collateral to be released constitutes First
                 Lien Debt and the Company (or with respect to releases under
                 the Security Documents, the grantor of the security interest
                 thereunder) has satisfied all the requirements for obtaining
                 subordination of the Security Interests therein pursuant to
                 Section 12.2 and such Collateral is (or will be, upon obtaining
                 such release) encumbered by a Lien permitted pursuant to the
                 terms of clauses (d), (k), (s) or (t) of the definition of
                 Permitted TARC Lien or clauses (f), (l) or (o) of the
                 definition of Permitted TransTexas Lien.

                         (xii)   the Collateral to be released consists of
                 deposit accounts of the Company, the TARC Intercompany Bridge
                 Loan and the rights of the Company under the Loan Agreement
                 relating to the TARC Intercompany Bridge Loan and the Release
                 Request delivered to the Trustee with respect to such release
                 states that concurrently with or immediately following the
                 effectiveness of such release the Company will issue Bridge
                 Loan Notes.

                                      -14-

<PAGE>   15


                                   ARTICLE II
                               GENERAL PROVISIONS

         Section 2.01. Effectiveness of Amendments. This Supplemental Indenture
is effective as of the date first above written.

         Section 2.02. Ratification of Indenture. The Original Indenture is in
all respects acknowledged, ratified and confirmed, and shall continue in full
force and effect in accordance with the terms thereof and as supplemented by
this Supplemental Indenture. The Original Indenture and this Supplemental
Indenture, shall be read, taken and construed as one and the same instrument.

         Section 2.03. Certificate and Opinion as to Conditions Precedent.
Simultaneously with and as a condition to the execution of this Supplemental
Indenture, the Company is delivering to the Trustee:

                 (a)   an Officers' Certificate in the form attached hereto as
Exhibit A; and

                 (b)   an Opinion of Counsel covering the matters described in
Exhibit B attached hereto.

         Section 2.04. Effect of Headings. The Article and Section headings in
this Supplemental Indenture are for convenience only and shall not affect the
construction of this Supplemental Indenture.

         Section 2.05. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE
CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK,
AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAW.

         Section 2.06. Counterparts. This Supplemental Indenture may be executed
in any number if counterparts, each of which so executed shall be deemed to be
an original, but all such counterparts shall together constitute the same
instrument.

                                      -15-

<PAGE>   16


         IN WITNESS WHEREOF, the parties to this Supplemental Indenture have
caused the Supplemental Indenture to be duly executed, and their respective
corporate seals to be hereunto affixed and attached, on and effective as of day
and year first above written.




                                      TRANSAMERICAN ENERGY CORPORATION



Attest:                               By:
       ----------------------------      ---------------------------------------
       Tim Moore,                        Ed Donahue,
       Assistant Secretary               Vice President, Chief Financial Officer
                                         and Secretary


                                      FIRSTAR BANK OF MINNESOTA, N.A.,
                                      as Trustee



                                      By:
                                         ---------------------------------------
                                         Frank P. Leslie, III,
                                         Vice President

                                      -16-


<PAGE>   1
                                                                    EXHIBIT 4.2

- -------------------------------------------------------------------------------



                        TRANSAMERICAN ENERGY CORPORATION,

                                   as Issuer,



                                       and



                        FIRSTAR BANK OF MINNESOTA, N.A.,

                                   as Trustee



                            ------------------------

                          THIRD SUPPLEMENTAL INDENTURE

                        Effective as of December 15, 1998

                           --------------------------



               $475,000,000 11 1/2% Senior Secured Notes due 2002

                                       and

            $1,130,000,000 13% Senior Secured Discount Notes due 2002

- --------------------------------------------------------------------------------

<PAGE>   2
                          THIRD SUPPLEMENTAL INDENTURE

         THIS THIRD SUPPLEMENTAL INDENTURE, effective as of December 15, 1998
(the "Supplemental Indenture"), is made and entered into by and among
TRANSAMERICAN ENERGY CORPORATION, a Delaware corporation (the "Company"), and
FIRSTAR BANK OF MINNESOTA, N.A. (the "Trustee"), under an Indenture dated as of
June 13, 1997, by and between the Company and the Trustee, as amended and
supplemented by a First Supplemental Indenture dated as of December 30, 1997 and
a Second Supplemental Indenture dated as of November 13, 1998 (as so amended,
the "Original Indenture"). All capitalized terms used in this Supplemental
Indenture that are defined in the Original Indenture, either directly or by
reference therein, have the respective meanings assigned to them therein, except
to the extent such terms are otherwise defined in this Supplemental Indenture or
the context clearly requires otherwise.

         WHEREAS, Section 9.2 of the Original Indenture provides, among other
things, that, with the consent of the Holders of not less than a majority in
aggregate Value of then outstanding Notes or, with respect to certain matters,
not less than 66-2/3% in aggregate Value of the Notes at the time outstanding,
the Company, when authorized by Board Resolutions, and the Trustee (with certain
exceptions) may amend or supplement the Original Indenture or the Security
Documents or enter into an indenture supplemental thereto for the purposes of
adding any provisions to or changing in any manner or eliminating any of the
provisions of the Original Indenture or the Security Documents or of modifying
in any manner the rights of the Holders under the Original Indenture or the
Notes; and

         WHEREAS, the Company has solicited consents from the Holders of the
Notes (the "Consent Solicitation") to amendments (the "Proposed Amendments") and
waivers (the "Proposed Waivers") to (i) the Original Indenture, (ii) the Loan
Agreement dated June 13, 1997, as amended, between the Company and TARC, (iii)
the Loan Agreement dated June 13, 1997, as amended, between the Company and
TransTexas and (iv) the Security and Pledge Agreement dated June 13, 1997,
between the Company and TransTexas; and

         WHEREAS, the Holders of at least 66-2/3% in aggregate Value of Notes at
the time outstanding have consented to the Proposed Amendments and Proposed
Waivers pursuant to the Consent Solicitation; and

         WHEREAS, the Board of Directors of the Company has adopted resolutions
authorizing and approving the Proposed Amendments and the Company and the
Trustee are executing and delivering this Supplemental Indenture in order to
provide for such amendments;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties to this Supplemental
Indenture hereby agree as follows:



                                       -2-

<PAGE>   3

                                    ARTICLE I

                        AMENDMENTS TO ORIGINAL INDENTURE

         Section 1.01. Amended Definitions. The following definitions in Section
1.1 of the Original Indenture are hereby amended as follows:

         (a) The definition of "Accounts Receivable Subsidiary" is hereby
amended to read in its entirety as follows:

                "Accounts Receivable Subsidiary" means a subsidiary of the
             Company, TARC, TCR Holding or TransContinental designated as an
             Accounts Receivable Subsidiary for the purpose of financing the
             accounts receivable of TransContinental.

         (b) The definition of "Affiliate" is hereby amended to read in its
entirety as follows:

                "Affiliate" means, with respect to any specified Person, (i) any
             other Person directly or indirectly controlling or controlled by,
             or under direct or indirect common control with, such specified
             Person or (ii) any officer, director or controlling shareholder of
             such other Person. For purposes of this definition, the term
             "control" means (a) the power to direct the management and policies
             of a Person, directly or through one or more intermediaries,
             whether through the ownership of voting securities, by contract, or
             otherwise, or (b) without limiting the foregoing, the beneficial
             ownership of 10% or more of the voting power of the voting common
             equity of such Person (on a fully diluted basis) or of warrants or
             other rights to acquire such equity (regardless of whether
             presently exercisable). Notwithstanding the foregoing, none of the
             Purchasers shall be deemed to be "Affiliates" of the Company or any
             of its Subsidiaries.

         (c) The definition of "Capital Improvement Program" is hereby amended
to read in its entirety as follows:

                "Capital Improvement Program" means the expansion and
             improvement program at TARC (or, after the Transaction Closing
             Date, TransContinental) that will be executed in two phases: Phase
             I and Phase II. The most significant projects include: (i)
             conversion of the visbreaker unit to a delayed coking unit to
             process vacuum tower bottoms into lighter petroleum products, (ii)
             modernization and upgrade of a fluid catalytic cracking unit to
             increase gasoline production capacity and allow the direct
             processing of low cost atmospheric residual feedstocks and (iii)
             upgrading and expanding hydrotreating, alkylation and sulfur
             recovery units to increase sour crude processing capacity.

         (d) The definition of "CATOFIN(R) Unit" is hereby amended to read in
its entirety as follows:

                "CATOFIN(R) Unit" means certain real property owned by TARC
             before the Transaction Closing Date as more specifically defined in
             the TARC Mortgage, together with all personal property of
             TransContinental now or hereinafter located on such real property
             but only to the extent that such property is part of a refining
             unit designed to produce propane and butane mono-olefins using the
             CATOFIN(R) process.

                                       -3-

<PAGE>   4
         (e) The definition of "Consolidated Fixed Charge Coverage Ratio" is
hereby amended to read in its entirety as follows:

                "Consolidated Fixed Charge Coverage Ratio" on any date (the
             "Transaction Date") means, with respect to any Person, the ratio,
             on a pro forma basis, of (i) (x) with respect to any Person other
             than TCR Holding, the aggregate amount of Consolidated EBITDA of
             such Person (attributable to continuing operations and businesses
             and exclusive of the amounts attributable to operations and
             businesses discontinued or disposed of, on a pro forma basis as if
             such operations and businesses were discontinued or disposed of on
             the first day of the Reference Period) for the Reference Period or
             (y) with respect to TCR Holding, the aggregate amount of dividends
             and other distributions on the Capital Stock of TransContinental
             received by TCR Holding from TransContinental during the Reference
             Period to (ii) the aggregate Consolidated Fixed Charges of such
             Person (exclusive of amounts attributable to discontinued
             operations and businesses on a pro forma basis as if such
             operations and businesses were discontinued or disposed of on the
             first day of the Reference Period, but only to the extent that the
             obligations giving rise to such Consolidated Fixed Charges would no
             longer be obligations contributing to such Person's Consolidated
             Fixed Charges subsequent to the Transaction Date) during the
             Reference Period; provided, that for purposes of such computation,
             in calculating Consolidated EBITDA and Consolidated Fixed Charges,
             (a) the transaction giving rise to the need to calculate the
             Consolidated Fixed Charge Coverage Ratio shall be assumed to have
             occurred on the first day of the Reference Period, (b) the
             incurrence of any Debt or issuance of Disqualified Capital Stock or
             the retirement of any Debt or Capital Stock during the Reference
             Period or subsequent thereto and on or prior to the Transaction
             Date shall be assumed to have occurred on the first day of such
             Reference Period, (c) Consolidated Interest Expense attributable to
             any Debt (whether existing or being incurred) bearing a floating
             interest rate shall be computed as if the rate in effect on the
             Transaction Date had been the applicable rate for the entire
             period, unless such Person or any of its Subsidiaries is a party to
             a Swap Obligation (that remains in effect for the 12-month period
             after the Transaction Date) that has the effect of fixing the
             interest rate on the date of computation, in which case such rate
             (whether higher or lower) shall be used, and (d) Consolidated
             EBITDA and Consolidated Fixed Charges of any Person shall be
             calculated by giving pro forma effect to the TTXD Spin-off and each
             other transaction described in the Offering Circular under the
             heading "Offering Circular Summary -- The Transactions" as if such
             transactions had occurred on the first day of the Reference Period,
             in each case, other than the TTXD Spin-off, only if such
             transaction has occurred during the Reference Period.

         (f) The definitions of "Construction Supervisor" and "Debt" are hereby
amended to read in their entirety as follows:

                "Construction Supervisor" means Baker & O'Brien, Inc., as
             construction supervisor of the Capital Improvement Program or any
             successor construction supervisor appointed by the Company with the
             approval of TCR Holding, which approval shall not be unreasonably
             withheld.

                "Debt" means with respect to any person, without duplication (i)
             all liabilities, contingent or otherwise, of such Person (a) for
             borrowed money (whether or not the

                                       -4-

<PAGE>   5
             recourse of the lender is to the whole of the assets of such Person
             or only to a portion thereof), (b) evidenced by bonds, notes,
             debentures, or similar instruments or letters of credit or
             representing the balance deferred and unpaid of the purchase price
             of any property acquired by such Person or services received by
             such Person (other than long-term services or supply contracts
             which required minimum periodic payments), (c) evidenced by
             bankers' acceptances or similar instruments issued or accepted by
             banks or Swap Obligations, (d) for the payment of money relating to
             a Capitalized Lease Obligation, (e) the Attributable Debt
             associated with any Sale and Leaseback Transaction or (f) Dollar-
             Denominated Production Payments that TransTexas or any of its
             Subsidiaries elect to treat as Debt (excluding all other Permitted
             Production Payment Obligations); (ii) reimbursement obligations of
             such Person with respect to letters of credit; (iii) all
             liabilities of others of the kind described in the preceding clause
             (i) or (ii) that such Person has guaranteed or that is otherwise
             its legal liability (to the extent of such guaranty or other legal
             liability) other than for endorsements, with recourse, of
             negotiable instruments in the ordinary course of business; (iv) all
             obligations secured by a Lien (other than Permitted Liens, except
             to the extent the obligations secured by such Permitted Liens are
             otherwise included in clause (i), (ii) or (iii) of this definition
             and are obligations of such Person) to which the property or assets
             (including, without limitation, leasehold interests and any other
             tangible or intangible property rights) of such Person are subject,
             regardless of whether the obligations secured thereby shall have
             been assumed by or shall otherwise be such Person's legal liability
             (but, if such obligations are not assumed by such Person or are not
             otherwise such Person's legal liability, the amount of such Debt
             shall be deemed to be limited to the fair market value of such
             property or assets determined as of the end of the preceding fiscal
             quarter); and (v) any and all deferrals, renewals, extensions,
             refinancings, and refundings (whether direct or indirect) of, or
             amendments, modifications, or supplements to, any liability of the
             kind described in any of the preceding clauses (i) through (iv)
             regardless of whether between or among the same parties.
             Notwithstanding anything to the contrary contained herein, for
             purposes of Section 4.11, notes issued in satisfaction of the
             interest obligation on up to $150 million principal amount of 15%
             Senior Secured Notes due 2003 issued pursuant to the Transaction in
             accordance with the terms thereof shall not constitute Debt except
             for purposes of the third to last and second to last paragraphs of
             Section 4.11.


         (g) The definition of "Disqualified Capital Stock" is hereby amended to
read in its entirety as follows:

                "Disqualified Capital Stock" means, with respect to any Person,
             any Capital Stock of such Person or its Subsidiaries that, by its
             terms or by the terms of any security into which it is convertible
             or exchangeable, is, or upon the happening of an event or the
             passage of time would be, required to be redeemed or repurchased by
             such Person or its Subsidiaries, including at the option of the
             holder, in whole or in part, or has, or upon the happening of an
             event or passage of time would have, a redemption or similar
             payment due, on or prior to June 15, 2002.

         (h) The definition of "Equipment" is hereby amended to read in its
entirety as follows:


                                       -5-

<PAGE>   6
                "Equipment" means and includes, as to (i) TransTexas or any of
             its Subsidiaries, all of such Person's now owned or hereafter
             acquired Vehicles, drilling rigs, workover rigs, fracture
             stimulation equipment, well site compressors, rolling stock and
             related equipment and other assets accounted for as equipment by
             such Person on its financial statements, all proceeds thereof (from
             insurance or otherwise), and all documents of title, books,
             records, ledger cards, files, correspondence, and computer files,
             tapes, disks and related data processing software that at any time
             evidence or contain information relating to the foregoing;
             provided, however, that "Equipment" shall not include any assets
             constituting part of a natural gas pipeline or the compression or
             dehydration equipment used in the operation of any such pipeline;
             provided further, however, notwithstanding the foregoing,
             "Equipment" shall include (x) production related facilities, (y)
             assets comprising amine plants and (z) equipment and related assets
             designed to dehydrate, compress, treat, separate, stabilize, store
             or otherwise process hydrocarbons, including, without limitation,
             the facilities at Winnie, Texas (including the real property
             associated with such facilities at Winnie, Texas) and (ii) TARC or
             any of its Subsidiaries, all of such Person's now owned or
             hereafter acquired Vehicles, rolling stock and related equipment
             and other assets accounted for as equipment by such Person in its
             financial statements, all proceeds thereof (from insurance or
             otherwise), and all documents of title, books, records, ledger
             cards, files, correspondence and computer files, tapes, disks and
             related data processing software that at any time evidence or
             contain information relating to the foregoing.

         (i) The definition of "Excess Cash" is hereby amended to read in its
entirety as follows:

                "Excess Cash" means the Net Cash Proceeds received by the
             Company from Asset Sales by the Company and the aggregate amount of
             cash and Cash Equivalents received by the Company from its
             Subsidiaries, including from dividends or payments in respect of
             Intercompany Loan Redemptions less the sum (without duplication) of
             (a) the provision for income and other taxes of the Company or, in
             the case of subclause (iii) of this clause (a), TransAmerican, (i)
             for the current fiscal year, (ii) for the immediately preceding
             fiscal year or (iii) relating to the sale by TransTexas of the
             Capital Stock of TransTexas Transmission Corporation, (b) without
             duplication, amounts received pursuant to the Services Agreement,
             (c) amounts used to pay consent fees in connection with a
             solicitation of waivers or amendments to the Notes, (d) dividends
             received from an Accounts Receivable Subsidiary; provided, that
             such funds are then contributed to TARC, TCR Holding or
             TransContinental, (e) payments of interest and principal on loans
             by the Company to TARC, TCR Holding, TransContinental or TransTexas
             which loans are permitted by the terms of the Indenture, (f)
             scheduled payments of interest and principal pursuant to the terms
             of the Intercompany Loans, (g) amounts used to pay interest,
             principal and premium on the Bridge Loan Notes, and (h) amounts
             reserved to make interest payments on the Notes as permitted by
             Section 3.1.


         (j) The definition of "First Lien Debt" is hereby amended to read in
its entirety as follows:

                "First Lien Debt" means any Debt or other obligation secured by
             a Permitted TransTexas Lien described in clause (c), (d), (e), (f),
             (i), (j),(k), (l), (o), (q), (r) to the extent that the Incurrence
             of the Permitted Lien to which such clause relates is one of the
             other

                                       -6-

<PAGE>   7

             clauses listed here, (s) or (t) of the definition of "Permitted
             TransTexas Liens," a Permitted TARC Lien described in clause (c),
             (d), (g), (h), (j), (k), (m), (o), (p), (q), (r) to the extent that
             the Incurrence of the Permitted Lien to which such clause relates
             is one of the other clauses listed here, (s), (t), (y) and (z) of
             the definition of "Permitted TARC Liens," or a Permitted TEC Lien
             described under clause (g) or (h) of Permitted TEC Liens including,
             in each case, any refinancings thereof.

         (k) The definition of "Gas Purchase Agreement" is hereby amended to
read in its entirety as follows:

                "Gas Purchase Agreement" means the Interruptible Gas Sales Terms
             and Conditions between TARC and TransTexas, as in effect on the
             Issue Date and as amended from time to time, provided that any such
             amendment is approved by the Board of Directors of each of the
             parties thereto.

         (l) The definition of "Guarantee" is hereby amended to read in its
entirety as follows:

                "Guarantee" means any guarantee of the obligations of TARC or
             TCR Holding under the TARC Intercompany Loan or of TransTexas under
             the TransTexas Intercompany Loan by any Guarantor.

         (m) The definition of "Guarantor" is hereby amended to read in its
entirety as follows:

                "Guarantor" means each of TARC's, TCR Holding's or TransTexas'
             Subsidiaries that becomes a guarantor of either the TARC
             Intercompany Loan or the TransTexas Intercompany Loan in compliance
             with the provisions of this Indenture.

         (n) The definition of "Insurance Proceeds" is hereby amended to read in
its entirety as follows:

                "Insurance Proceeds" means the interest in and to all proceeds
             (net of costs of collection, including attorney's fees) which now
             or hereafter may be paid under any insurance policies now or
             hereafter obtained by or on behalf of the Company, TARC, TCR
             Holding, TransTexas, or any Guarantor in connection with any assets
             thereof, together with interest payable thereon and the right to
             collect and receive the same, including, without limitation,
             proceeds of casualty insurance, title insurance, business
             interruption insurance and any other insurance now or hereafter
             maintained with respect to such assets.

         (o) The definition of "Intercompany Loan Redemption" is hereby amended
to read in its entirety as follows:

                "Intercompany Loan Redemption" means an optional redemption by
             TCR Holding or TransTexas of all or a portion of the accreted value
             or principal amount, as the case may be, then outstanding under the
             TARC Intercompany Loan or the TransTexas Intercompany Loan,
             respectively, in cash at a redemption price equal to 100% of the
             accreted value of the TARC Intercompany Loan and the principal
             amount of the TransTexas Intercompany Loan in each case, plus
             accrued and unpaid interest, if any, to and including the
             redemption date.


                                       -7-

<PAGE>   8
         (p) The definition of "Inventory" is hereby amended to read in its
entirety as follows:

                "Inventory" means and includes, (i) as to TransTexas, all of
             TransTexas' now owned or hereafter acquired casing, drill pipe and
             other supplies accounted for as inventory by TransTexas on its
             financial statements (excluding any Hydrocarbons), all proceeds
             thereof (from insurance or otherwise), and all documents of title,
             books, records, ledger cards, files, correspondence, and computer
             files, tapes, disks and related data processing software that at
             any time evidence or contain information relating to the foregoing
             and (ii) as to TARC, feedstocks, refined products, chemicals and
             catalysts, other supplies and storeroom items and similar items
             accounted for as inventory by TARC on its financial statements, all
             proceeds thereof (from insurance or otherwise), and all documents
             of title, books, records, ledger cards, files, correspondence, and
             computer files, tapes, disks and related data processing software
             that at any time evidence or contain information relating to the
             foregoing.

         (q) The definition of "Permitted Hedging Transactions" is hereby
amended to read in its entirety as follows:

                "Permitted Hedging Transactions" means non-speculative
             transactions in futures, forwards, swaps or option contracts
             (including both physical and financial settlement transactions)
             engaged in by the TARC Entities, TransContinental or the TransTexas
             Entities as part of their normal business operations as a
             risk-management strategy or hedge against adverse changes in the
             prices of natural gas, condensate, feedstock or refined products;
             provided, that such transactions do not in the case of TransTexas
             or its Subsidiaries, on a monthly basis, relate to more than 90% of
             the TransTexas Entities' average net hydrocarbon production per
             month from the Continuing Operations for the most recent 3-month
             period measured at the time of such incurrence; provided, further,
             that, at the time of such transaction (i) the counter party to any
             such transaction is an Eligible Institution or a Person that has an
             Investment Grade Rating or has an issue of debt securities or
             preferred stock outstanding with an Investment Grade Rating or (ii)
             such counter party's obligation pursuant to such transaction is
             unconditionally guaranteed in full by, or secured by a letter of
             credit issued by, an Eligible Institution or a Person that has an
             Investment Grade Rating or that has an issue of debt securities or
             preferred stock outstanding with an Investment Grade Rating.

         (r) The definition of "Permitted Investment" is hereby amended to read
in its entirety as follows:

                "Permitted Investment" means, when used with reference to the
             Company or its Subsidiaries, (i) trade credit extended to persons
             in the ordinary course of business; (ii) purchases of Cash
             Equivalents; (iii) Investments by TransTexas or its wholly owned
             Subsidiaries in wholly owned Subsidiaries of TransTexas (other than
             TTXD) that are engaged in Related TransTexas Businesses,
             Investments by any of the TARC Entities or any of the TCR Holding
             Entities in any of the TCR Holding Entities that are engaged, or
             are formed to engage, in Related TARC Businesses or in
             TransContinental, Investments by any of the TCR Holding Entities in
             any of the TARC Entities that are engaged, or are formed to engage,
             in Related TARC Businesses and Investments by the Company in any of
             the TARC Entities or any of the TCR Holding Entities that are
             engaged, or are formed to engage, in


                                       -8-

<PAGE>   9
             Related TARC Businesses; (iv) Swap Obligations; (v) the receipt
             of capital stock in lieu of cash in connection with the settlement
             of litigation; (vi) advances to officers and employees in
             connection with the performance of their duties in the ordinary
             course of business in an amount not to exceed $3,000,000 in the
             aggregate outstanding at any time in the case of each of (i) the
             TARC Entities and (ii) the TransTexas Entities; (vii) margin
             deposits in connection with Permitted Hedging Transactions; (viii)
             an Investment in one or more Unrestricted Subsidiaries of (a)
             TransTexas in an aggregate amount, net of return on such
             Investment, not in excess of $25,000,000 less the amount of any
             Unrestricted Non-Recourse Debt outstanding of TransTexas or any of
             its Subsidiaries and (b) TARC of the assets comprising the
             CATOFIN(R) Unit owned by TARC as of the date hereof; (ix)
             Investments and expenditures made in the ordinary course of
             business by TransTexas or its Subsidiaries, and of a nature that is
             or shall have become customary in, the oil and gas business as a
             means of actively exploiting, exploring for, acquiring, developing,
             processing, gathering, marketing or transporting oil or gas or
             providing services with respect to such activities through
             agreements, transactions, interests or arrangements which permit a
             person to share risks or costs, comply with regulatory requirements
             regarding local ownership or satisfy other objectives customarily
             achieved through the conduct of the oil and gas business jointly
             with third parties, including, without limitation, (a) ownership
             interests in oil and gas properties or gathering systems and (b)
             Investments and expenditures in the form of or pursuant to
             operating agreements, processing agreements, farm-in agreements,
             farm-out agreements, development agreements, area of mutual
             interest agreements, unitization agreements, pooling arrangements,
             joint bidding agreements, service contracts, joint venture
             agreements, partnership agreements (whether general or limited),
             subscription agreements, stock purchase agreements and other
             similar agreements with third parties (including Unrestricted
             Subsidiaries); provided, that in the case of any joint venture
             primarily engaged in processing, gathering, marketing or
             transporting oil or gas (i) all Debt of such joint venture (other
             than a joint venture that is an Unrestricted Subsidiary) that would
             not otherwise constitute Debt of one of the TransTexas Entities
             shall be deemed Debt of TransTexas in proportion to its direct or
             indirect ownership interest in such joint venture and (ii) such
             joint venture shall be reasonably calculated to enhance the value
             of the reserves of the TransTexas Entities or marketability of
             production from such reserves; (x) a guaranty by any Subsidiary of
             the Company permitted under Section 4.11; (xi) deposits permitted
             by the definition of Permitted Liens or any extension, renewal, or
             replacement of any of them, (xii) the TTXD Equity Investment (in
             addition to any contribution by TransTexas pursuant to clause
             (xiii) below), (xiii) capital contributions by TransTexas to TTXD
             or to a joint venture, a partnership, a limited liability company
             or a similar entity of TransTexas' drilling and energy services
             business and pipeline services business and related assets, (xiv)
             any acquisition by TARC of tank storage facilities (or the company
             that owns such facilities) in the vicinity of the TARC refinery,
             (xv) guarantees by TransTexas of Debt of TTXD to the extent that
             such Debt relates to assets contributed to TTXD pursuant to clause
             (xiii) hereof, (xvi) Investments in Accounts Receivables Subsidiary
             Notes by the Company, any of the TARC Entities or any of the TCR
             Holding Entities in amounts not to exceed the greater of
             $20,000,000 or 20% of the TransContinental Borrowing Base at any
             one time, (xvii) loans from the Company to its Subsidiaries or
             TransContinental (other than the TTXD Entities prior to the TTXD
             Spin-off) with (i) the excess of the Excess Cash Offer Amount
             (after reserving the full Interest Reserve Amount) over the Excess
             Cash Acceptance Amount, provided, that such loans are on terms no
             less favorable to the Company than were

                                       -9-

<PAGE>   10
             disclosed to the Holders of the Notes in the Excess Cash Offer
             or (ii) the excess of the Additional Interest Excess Cash Offer
             Amount over the Additional Interest Excess Cash Acceptance Amount,
             provided, that such loans are on terms no less favorable to the
             Company than were disclosed to the Holders of the Notes in the
             Additional Interest Excess Cash Offer, (xviii) an Investment in
             Capital Stock resulting from an Asset Sale pursuant to clause
             (xiii) of Section 4.14(b), (xix) Investments by the Company in an
             Accounts Receivable Subsidiary, or by the Company or TARC in a
             reincorporation subsidiary in each case in connection with the
             initial capitalization thereof and not to exceed $1,000, (xx)
             Investments by the Company, TARC, TCR Holding or a wholly owned
             Subsidiary of any of them solely for the purpose of facilitating a
             repurchase of the TARC Warrants, (xxi) other Investments not in
             excess of $5,000,000 at any time outstanding, (xxii) loans made (X)
             to officers, directors and employees of the Company or any of its
             Subsidiaries approved by the applicable Board of Directors (or by
             an authorized officer), the proceeds of which are used solely to
             purchase stock or to exercise stock options received pursuant to an
             employee stock option plan or other incentive plan, in a principal
             amount not to exceed the purchase price of such stock or the
             exercise price of such stock options, as applicable and (Y) to
             refinance loans, together with accrued interest thereon, made
             pursuant to this clause, in each case not in excess of $3,000,000
             in the aggregate outstanding at any one time, (xxiii) Investments
             by the Company in its Subsidiaries in an aggregate amount not to
             exceed the proceeds of Subordinated Debt permitted to be incurred
             pursuant to clause (5)(d) of Section 4.11, (xxiv) Investments by
             the Company in TARC, TCR Holding or TransContinental in an amount
             not to exceed the amounts received by the Company from an Accounts
             Receivable Subsidiary, (xxv) a capital contribution by TTXD of any
             or all of its assets to a joint venture, a partnership, a limited
             liability company or a similar entity, (xxvi) a capital
             contribution by the Company to TARC in an amount not to exceed
             $226,000,000 (inclusive of any equity contribution made as
             described in the Offering Circular under the heading "The
             Transactions -- TARC Equity Contribution"), (xxvii) any deposit or
             escrow of funds in connection with adjustments to the Lobo Sale
             purchase price, (xxviii) loans made by the Company to TransTexas,
             TARC, TCR Holding or TransContinental which in the aggregate do not
             exceed $50,000,000 principal amount outstanding at any one time,
             (xxix) loans from the Company to TARC of an amount equal to the
             proceeds received by it from the issuance of the Bridge Loan Notes,
             (xxx) the purchase or other acquisition by TARC or TCR Holding or
             its Subsidiaries of Notes or (xxxi) the purchase or other
             acquisition by TransTexas of Notes to the extent, but only to the
             extent, that TransTexas has received such Notes, or an amount equal
             to its cost of acquiring such Notes, as a capital contribution from
             Persons other than the Company or its Subsidiaries.

         (s) The definition of "Permitted Production Payment Obligations" is
hereby amended to read in its entirety as follows:

                "Permitted Production Payment Obligations" means Volumetric
             Production Payments and Dollar-Denominated Production Payments each
             as permitted to be made hereunder, and similar burdens on the
             property of TransTexas or any Subsidiary of TransTexas to the
             extent such burdens are limited in recourse to (x) the properties
             subject to such interests or agreements (including, without
             limitation, TransTexas' contract rights in related Permitted
             Hedging Transactions), (y) the Hydrocarbons produced from such
             properties, and (z) the proceeds of such Hydrocarbons.

                                      -10-

<PAGE>   11

         (t) The definition of "Permitted TARC Liens" is hereby amended to read
in its entirety as follows:

                "Permitted TARC Liens" means (a) Liens imposed by governmental
             authorities for taxes, assessments, or other charges not yet due or
             which are being contested in good faith and by appropriate
             proceedings, if adequate reserves with respect thereto are
             maintained on the books of any of the TARC Entities in accordance
             with GAAP; (b) statutory Liens of landlords, carriers,
             warehousemen, mechanics, materialmen, repairmen, mineral interest
             owners, or other like Liens arising by operation of law in the
             ordinary course of business provided that (i) the underlying
             obligations are not overdue for a period of more than 60 days, or
             (ii) such Liens are being contested in good faith and by
             appropriate proceedings and adequate reserves with respect thereto
             are maintained on the books of any of the TARC Entities in
             accordance with GAAP; (c) deposits of cash or Cash Equivalents to
             secure (i) the performance of bids, trade contracts (other than
             borrowed money), leases, statutory obligations, surety bonds,
             performance bonds, and other obligations of a like nature incurred
             in the ordinary course of business (or to secure reimbursement
             obligations or letters of credit issued to secure such performance
             or other obligations) in an aggregate amount outstanding at any one
             time not in excess of $5,000,000 or (ii) appeal or supersedeas
             bonds (or to secure reimbursement obligations or letters of credit
             in support of such bonds); (d) easements, servitudes,
             rights-of-way, zoning, similar restrictions and other similar
             encumbrances or title defects incurred in the ordinary course of
             business which, in the aggregate, are not material in amount and
             which do not, in any case, materially detract from the value of the
             property subject thereto (as such property is used by any of the
             TARC Entities) or materially interfere with the ordinary conduct of
             the business of any of the TARC Entities including, without
             limitation, any easement or servitude granted in connection with
             the Port Commission Bond Financing; (e) Liens arising by operation
             of law in connection with judgments, only to the extent, for an
             amount and for a period not resulting in an Event of Default with
             respect thereto; (f) Liens securing Debt or other obligations not
             in excess of $3,000,000; (g) pledges or deposits made in the
             ordinary course of business in connection with worker's
             compensation, unemployment insurance, other types of social
             security legislation, property insurance and liability insurance;
             (h) Liens on Equipment, Receivables and Inventory; (i) Liens on the
             assets of any entity existing at the time such assets are acquired
             by any of the TARC Entities, whether by merger, consolidation,
             purchase of assets or otherwise so long as such Liens (i) are not
             created, incurred or assumed in contemplation of such assets being
             acquired by any of the TARC Entities and (ii) do not extend to any
             other assets of any of the TARC Entities; (j) Liens (including
             extensions and renewals thereof) on real or personal property,
             acquired after the Issue Date ("New TARC Property"); provided,
             however, that (i) such Lien is created solely for the purpose of
             securing Debt Incurred to finance the cost (including the cost of
             improvement or construction) of the item of New TARC Property
             subject thereto and such Lien is created at the time of or within
             six months after the later of the acquisition, the completion of
             construction, or the commencement of full operation of such New
             TARC Property, (ii) the principal amount of the Debt secured by
             such Lien does not exceed 100% of such cost plus reasonable
             financing fees and other associated reasonable out-of-pocket
             expenses (iii) any such Lien shall not extend to or cover any
             property or assets other than such item of New TARC Property and
             any improvements on such New TARC Property and

                                      -11-

<PAGE>   12
             (iv) such Lien does not extend to assets or property which are
             part of the fixed refinery assets which are part of the Capital
             Improvement Program; (k) leases or subleases granted to others that
             do not materially interfere with the ordinary course of business of
             any of the TARC Entities, taken as a whole; (l) Liens on the assets
             of one of the TARC Entities in favor of another TARC Entity; (m)
             Liens securing reimbursement obligations with respect to letters of
             credit that encumber documents relating to such letters of credit
             and the products and proceeds thereof; provided, that, such
             reimbursement obligations are not matured for a period of over 60
             days; (n) Liens in favor of customs and revenue authorities arising
             as a matter of law to secure payment of customs duties in
             connection with the importation of goods; (o) Liens encumbering
             customary initial deposits and margin deposits securing Swap
             Obligations or Permitted Hedging Transactions and Liens encumbering
             contract rights under Permitted Hedging Transactions; (p) Liens on
             cash deposits to secure reimbursement obligations with respect to
             letters of credit after the Delayed Coking Unit is completed; (q)
             Liens that secure Unrestricted Non-Recourse Debt; provided,
             however, that at the time of incurrence the aggregate fair market
             value of the assets securing such Lien (exclusive of the stock of
             the applicable Unrestricted Subsidiary) shall not exceed the amount
             of allowed Unrestricted Non-Recourse Debt of TARC, or TCR Holding;
             (r) Liens on the proceeds of any property subject to a Permitted
             TARC Lien or on deposit accounts containing any such proceeds; (s)
             Liens on the proceeds of any property that is not Collateral, on
             the proceeds of any Debt Incurred in accordance with the provisions
             hereof, or on deposit accounts containing any such proceeds; (t)
             Liens imposed on the Port Facility Assets; (u) any extension,
             renewal or replacement of the Liens created pursuant to any of
             clauses (a) through (g), (i) through (t), (u) or (w) provided that
             such Liens would have otherwise been permitted under such clauses,
             and provided further that the Liens permitted by this clause (u) do
             not secure any additional Debt or encumber any additional property;
             (v) Liens of the trustee under indenture and related collateral
             documents governing the terms of the Senior TARC Mortgage Notes and
             the Senior TARC Discount Notes; (w) Liens in favor of the Company
             or its assignee under the Security Documents; (y) Liens on tank
             storage facilities in the vicinity of the TARC refinery acquired
             after the date hereof;(z) Liens on any property of TARC and any
             agreement to grant such Liens; provided that such Liens may not be
             granted, and any agreement to grant such Liens shall not obligate
             TARC to grant such Liens, until the TARC Intercompany Loan has been
             paid in full and has not been refinanced, refunded or replaced with
             the proceeds of other Debt ("Other Debt"), which Other Debt has a
             lower cost of capital to TARC than the TARC Intercompany Loan and
             the principal amount of such Other Debt (or, if such Other Debt is
             issued with original issued discount, the original issue price of
             such Other Debt) is equal to or less than the original price of,
             plus amortization of the original issue discount on, the TARC
             Intercompany Loan at the time of the Incurrence of such Other Debt;
             (aa) Liens securing the TARC Intercompany Bridge Loan; (bb) Liens
             on any property owned by TransContinental; and (cc) a Lien in favor
             of the Purchasers and others securing Debt of TARC or TCR Holding
             in an aggregate principal amount not in excess of $150,000,000.

         (u) The definition of "Permitted TransTexas Liens" is hereby amended to
read in its entirety as follows:

                "Permitted TransTexas Liens" means (a) Liens imposed by
             governmental authorities for taxes, assessments, or other charges
             not yet due or which are being contested in good


                                      -12-

<PAGE>   13
             faith and by appropriate proceedings, if adequate reserves with
             respect thereto are maintained on the books of any of the
             TransTexas Entities in accordance with GAAP; (b) statutory Liens of
             landlords, carriers, warehousemen, mechanics, materialmen,
             repairmen, mineral interest owners, or other like Liens arising by
             operation of law in the ordinary course of business, provided that
             (i) the underlying obligations are not overdue for a period of more
             than 60 days, or (ii) such Liens are being contested in good faith
             and by appropriate proceedings and adequate reserves with respect
             thereto are maintained on the books of any of the TransTexas
             Entities in accordance with GAAP; (c) (i) pledges of assets or
             deposits of cash or Cash Equivalents to secure the performance of
             bids, trade contracts (other than borrowed money), leases,
             statutory obligations, surety bonds, performance bonds and other
             obligations of a like nature incurred in the ordinary course of
             business (or to secure reimbursement obligations or letters of
             credit in support of such bonds) in an aggregate amount not in
             excess of 5% of the SEC PV10 indicated on TransTexas' most recent
             Reserve Report at the time such pledges or deposits are made or
             (ii) pledges of assets, the fair market value of which is not in
             excess of $40,000,000 in the aggregate pledged at any one time, or
             deposits of cash or Cash Equivalents, in each case, to secure
             appeal or supersedeas bonds (or to secure reimbursement obligations
             or letters of credit in support of such bonds); (d) Liens
             encumbering customary initial deposits and margin deposits securing
             Swap Obligations or Permitted Hedging Transactions and Liens
             encumbering contract rights under Permitted Hedging Transactions;
             (e) pledges of assets including, without limitation, the mortgage
             of a production payment by a Hedging Subsidiary, to secure margin
             obligations, settlement obligations, reimbursement obligations or
             letters of credit in connection with Permitted Hedging
             Transactions; provided that, at the time such pledge is made (or,
             if such pledge secures future Permitted Hedging Transactions, at
             the time any such Permitted Hedging Transaction is entered into),
             the maximum aggregate exposure under such Permitted Hedging
             Transactions does not exceed the greater of (i) $25,000,000 or (ii)
             10% of the SEC PV10 indicated on TransTexas' then most recent
             Reserve Report; (f) easements, rights-of-way, zoning, similar
             restrictions and other similar encumbrances or title defects
             incurred in the ordinary course of business which, in the
             aggregate, are not material in amount, and which do not in any case
             materially detract from the value of the property subject thereto
             (as such property is used by any of the TransTexas Entities) or
             materially interfere with the ordinary conduct of the business of
             any of the TransTexas Entities; (g) Liens arising by operation of
             law in connection with judgments, only to the extent, for an amount
             and for a period not resulting in an Event of Default with respect
             thereto; (h) Liens securing Debt or other obligations not in excess
             of $3,000,000 in the aggregate outstanding at any one time and
             Liens existing on the date of this Indenture; (i) pledges or
             deposits made in the ordinary course of business in connection with
             worker's compensation, unemployment insurance, and other types of
             social security legislation, property insurance and liability
             insurance; (j) Liens granted on Equipment, Inventory or
             Receivables; (k) Liens granted in connection with the Presale of
             Gas, provided that all of the proceeds from such Presale of Gas
             shall be applied to an Intercompany Loan Redemption; (l) Liens
             created on acreage drilled or to be drilled pursuant to Drilling
             Programs, on Hydrocarbons produced therefrom and on the proceeds of
             such Hydrocarbons to secure TransTexas' obligations thereunder,
             provided that (i) the number of wells included in such program
             commenced in any fiscal year does not exceed 30 per fiscal year
             (plus the number of wells included in programs commenced in prior
             years but not yet completed), (ii) such obligations are limited to
             a percentage of production from such


                                      -13-

<PAGE>   14
             wells, (iii) such Liens survive only until the Person to whom such
             Lien was granted has received production with a value equal to the
             reimbursable costs, expenses and fees related to property and
             services provided or paid for by such Person plus an agreed-upon
             interest component, and (iv) such Liens secure obligations that are
             nonrecourse to each of the Company or its Subsidiaries; (m) Liens
             on the assets of any entity existing at the time such assets are
             acquired by any of the TransTexas Entities, whether by merger,
             consolidation, purchase of assets or otherwise so long as such
             Liens (i) are not created, incurred or assumed in contemplation of
             such assets being acquired by any of the TransTexas Entities and
             (ii) do not extend to any other assets of any of the Company or its
             Subsidiaries; (n) any extension, renewal, or replacement of Liens
             created pursuant to any of clauses (a) through (g), (i), (k)
             through (m) or (q) through (t) of this definition, provided that
             such Liens would have otherwise been permitted under such clauses,
             and further provided that the Liens permitted by this clause (n) do
             not secure any additional Debt or encumber any additional property;
             (o) Liens securing (i) Royalty Payment Obligations and (ii)
             Permitted Production Payment Obligations; (p) Liens on the assets
             of any of the TransTexas Entities in favor of another TransTexas
             Entity; (q) Liens that secure Unrestricted Non-Recourse Debt;
             provided however, that at the time of incurrence the aggregate fair
             market value of the assets securing such Lien (exclusive of the
             stock of the applicable Unrestricted Subsidiary) shall not exceed
             the amount of allowed Unrestricted Non-Recourse Debt of TransTexas;
             (r) Liens on the proceeds of any property subject to a Permitted
             TransTexas Lien or on deposit accounts containing any such
             proceeds; (s) Liens on the proceeds of any property that is not
             Collateral; (t) Liens (including extensions and renewals thereof)
             on real or personal property, acquired after the Issue Date ("New
             TransTexas Property"); provided, however, that (i) such Lien is
             created solely for the purpose of securing Debt Incurred to finance
             the cost (including the cost of improvements or construction) of
             New TransTexas Property subject thereto and such Lien is created at
             the time of or within six months after the later of the
             acquisition, the completion of construction, or the commencement of
             full operation of such New TransTexas Property, (ii) the principal
             amount of the Debt secured by such Lien does not exceed 100% of
             such cost including costs and fees related to the financing
             thereof, (iii) any such Lien shall not extend to or cover any
             property or assets other than such item of New TransTexas property
             and any improvements on such New TransTexas Property; (u) Liens of
             the trustee under the Indenture and related collateral documents
             governing the terms of the TransTexas Senior Notes and (v) Liens in
             favor of the Company or its assignee under the Security Documents.

         (v) The definition of "Phase I Completion Date" is hereby amended to
read in its entirety as follows:

                "Phase I Completion Date" means the date on which the
             Construction Supervisor issues a written notice (the "Phase I
             Completion Notice") to the Company certifying that the Phase I
             Performance Test has been completed.

         (w) A definition of "Phase I Performance Test" is hereby added to the
Original Indenture to read in its entirety as follows:

                "Phase I Performance Test" means for a period of at least 72
             uninterrupted hours, TransContinental's refinery has sustained (i)
             an average feedstock throughput level of at

                                      -14-

<PAGE>   15




             least 150,000 barrels per day and (ii) no net production of vacuum 
             tower bottoms when using as input a combined feedstock slate with 
             an average API Gravity of 22 degrees or less.

         (x) The definition of "Phase II Completion Date" is hereby amended to
read in its entirety as follows:

                "Phase II Completion Date" means the date on which the
             Construction Supervisor issues a written notice (the "Phase II
             Completion Notice") to the Company certifying that for a period of
             at least 72 uninterrupted hours, TransContinental's refinery has
             sustained (i) an average feedstock throughput level of at least
             180,000 barrels per day and (ii) average production yields
             (measured as the liquid volume percent of feedstock throughput) of
             refined products with a specific gravity of gasoline or lighter of
             at least 40% and of middle distillates or lighter of at least 60%,
             when using a combined Crude Unit feedstock slate with an average
             API Gravity of 22 degrees or less.

         (y) The definition of "Plans" is hereby amended to read in its entirety
as follows:

                "Plans" means (a) the plans and specifications prepared by or on
             behalf of TARC (or, after the Transaction Closing Date,
             TransContinental), which describe and show the proposed expansion
             and modification of TARC's (or, after the Transaction Closing Date,
             TransContinental's) refinery, as amended from time to time with the
             consent of the Construction Supervisor and (b) a budget prepared by
             or on behalf of TARC (or, after the Transaction Closing Date,
             TransContinental), as amended from time to time with the consent of
             the Construction Supervisor.

         (z) The definition of "Port Commission Bond Financing" is hereby
amended to read in its entirety as follows:

                "Port Commission Bond Financing" means a financing transaction
             involving the transfer (including, without limitation, transfer by
             sale, lease, lien or mortgage) of TransContinental's interest in
             all or some of the following assets (together with the granting, at
             TransContinental's discretion, of any easements or servitudes
             reasonably necessary to the ownership or operation of such assets
             by the transferee) which are under construction in or near
             TransContinental's refinery: (i) the Prospect Road tank farm and
             other tanks; (ii) certain dock improvements; (iii) the dock vapor
             recovery system; (iv) the coke handling system; (v) the refinery
             waste water treatment facility and (vi) tankage for liquefied
             petroleum gas (the "Port Facility Assets").

        (aa) A definition of "Purchasers" is hereby added to the Original
Indenture to read in its entirety as follows:

                "Purchasers" means the initial purchasers from TARC pursuant to
             the Transaction of voting stock of TCR Holding and their
             transferees and Affiliates (in each case other than the Company and
             its Subsidiaries).


                                      -15-

<PAGE>   16
        (bb) A definition of "Refinery Assets" is hereby added to the Original 
Indenture to read in its entirety as follows:

                "Refinery Assets" means substantially all of the assets of TARC
             immediately prior to the Transaction Closing Date.

        (cc) The definition of "Related Person" is hereby amended to read in its
entirety as follows:

                "Related Person" means (i) any Person (other than a Purchaser or
             TransContinental and any of its Subsidiaries) directly or
             indirectly controlling or controlled by or under direct or indirect
             common control with the Company or any Subsidiary of the Company or
             any officer, director, or employee of the Company or any Subsidiary
             of the Company or of such Person, (ii) the spouse, any immediate
             family member, or any other relative who has the same principal
             residence of any Person described in clause (i) above, and any
             Person, directly or indirectly, controlling or controlled by or
             under direct or indirect common control with, such spouse, family
             member, or other relative, and (iii) any trust in which any Person
             described in clause (i) or (ii), above, is a fiduciary or has a
             beneficial interest. For purposes of this definition the term
             "control" means (a) the power to direct the management and policies
             of a Person, directly or through one or more intermediaries,
             whether through the ownership of voting securities, by contract, or
             otherwise, or (b) the beneficial ownership of 10% or more of the
             voting common equity of such Person (on a fully diluted basis) or
             of warrants or other rights to acquire such equity (whether or not
             presently exercisable).

        (dd) The definition of "Related TransTexas Business" is hereby amended
to read in its entirety as follows:

                "Related TransTexas Business" means (i) the exploration for,
             acquisition of, development of, production, transportation,
             gathering, and processing (in connection with natural gas and
             natural gas liquids only) of, crude oil, natural gas, condensate,
             and natural gas liquids; provided that the Related TransTexas
             Business shall not include any refining or distilling of
             Hydrocarbons other than processing and fractionating natural gas
             and natural gas liquids, (ii) the drilling and energy services
             business and pipeline services business, (iii) owning and operating
             a Hedging Subsidiary or (iv) owning and operating facilities in or
             near Winnie, Texas, designed for separation, dehydration,
             treatment, stabilization, processing and storage of hydrocarbons
             and related operations.

        (ee) The definition of "Restricted Payment" is hereby amended to read in
its entirety as follows:

                "Restricted Payment" means, with respect to any Person, (i) any
             Restricted Investment, (ii) any dividend or other distribution on
             shares of Capital Stock of such Person or any Subsidiary of such
             Person, (iii) any payment on account of the purchase, redemption,
             or other acquisition or retirement for value of any shares of
             Capital Stock of such Person, and (iv) any defeasance, redemption,
             repurchase, or other acquisition or retirement for value, or any
             payment in respect of any amendment in anticipation of or in
             connection with any such retirement, acquisition, or defeasance, in
             whole or in part, of any Subordinated Debt, directly or indirectly,
             of such Person or a Subsidiary of such Person prior to the


                                      -16-

<PAGE>   17
             scheduled maturity or prior to any scheduled repayment of
             principal in respect of such Subordinated Debt; provided, however,
             that the term "Restricted Payment" does not include (i) any
             dividend, distribution, or other payment on shares of Capital Stock
             of an issuer solely in shares of Qualified Capital Stock of such
             issuer that is at least as junior in ranking as the Capital Stock
             on which such dividend, distribution, or other payment is to be
             made, (ii) any dividend, distribution, or other payment to the
             Company from any of its Subsidiaries, (iii) any defeasance,
             redemption, repurchase, or other acquisition or retirement for
             value, in whole or in part, of any Subordinated Debt of such Person
             payable solely in shares of Qualified Capital Stock of such Person,
             (iv) any payments or distributions made pursuant to and in
             accordance with the Transfer Agreement, the TransTexas Drilling
             Agreement, the Services Agreement, the Office Leases or the Tax
             Allocation Agreement, (v) any dividend, distribution or other
             payment to TARC by TCR Holding or by any of TARC's Subsidiaries, to
             TCR Holding by any of TCR Holding's Subsidiaries or to TransTexas
             by any of its Subsidiaries, (vi) any Intercompany Loan Redemptions,
             (vii) any redemption, repurchase or other retirement for value of
             the TARC Warrants by the Company, TARC or TCR Holding, including
             any premium paid thereon, (viii) any redemption, repurchase or
             other retirement for value of the TEC Preferred Stock by the
             Company, including any premium paid thereon, (ix) any redemption,
             defeasance, repurchase or other retirement for value of the Senior
             TARC Mortgage Notes by TARC, including any premium paid thereon,
             (x) any redemption, defeasance, repurchase or other retirement for
             value of the Senior TARC Discount Notes by TARC, including any
             premium paid thereon, (xi) any redemption, defeasance, repurchase
             or other retirement for value of the Senior TransTexas Notes by
             TransTexas, including any premium paid thereon, (xii) an Investment
             by TransTexas in, or distribution by TransTexas on, its Capital
             Stock pursuant to share repurchases or dividends on its Capital
             Stock in each case as described in the Offering Circular under the
             caption "Transactions" in an aggregate amount not to exceed
             $400,000,000, (xiii) the redemption, purchase, retirement or other
             acquisition of any Debt, including any premium paid thereon, with
             the proceeds of any refinancing Debt permitted to be incurred
             pursuant to clause (1)(g), (2)(u), (2)(w), (3)(j), 4(j), (4)(w),
             (4)(z) or 5(e) of Section 4.11, (xiv) the distribution by
             TransTexas of shares of capital stock of TTXD in connection with
             the TTXD Spin-off, (xv) after the repayment of the TARC
             Intercompany Loan or the TransTexas Intercompany Loan, dividends or
             other distributions on shares of common stock of TARC or
             TransTexas, respectively, provided that each such dividend or
             distribution is paid to all holders of common stock of such entity
             on a pro rata basis, (xvi) the purchase by TARC, TCR Holding or
             TransTexas of shares of Capital Stock of TARC, TCR Holding,
             TransContinental, TransTexas or TTXD in connection with each of
             their employee benefit plans, including without limitation any
             employee stock ownership plans or any employee stock option plans,
             in an aggregate amount, with respect to the issuer, not to exceed
             7% of the aggregate number of shares of voting stock held by
             non-affiliates of the issuer measured from the date of the first
             such purchase, (xvii) dividends or other payments not to exceed
             $23,000,000 in the aggregate from the Company to TransAmerican,
             (xviii) any repayment or retirement for value by TARC, TCR Holding
             or TransTexas of any loan from the Company incurred pursuant to
             clause (1)(q), (1)(r), (2)(o), (2)(p), (3)(u), (3)(v), (4)(s), or
             (4)(t) of Section 4.11, (xix) any purchase of Capital Stock of TCR
             Holding by the Company or TARC, (xx) any purchase of Capital Stock
             of TransContinental by TCR Holding, (xxi) repayments by TCR Holding
             of its promissory note in the initial aggregate principal amount of
             $200,000,000 to TARC as part of a contemporaneous exchange of


                                      -17-

<PAGE>   18
             subordinated notes of TCR Holding, (xxii) after the repayment of 
             the TransTexas Intercompany Loan, repayments or repurchases by
             TransTexas of its Senior Subordinated Notes due 2003, and (xxiii)
             any distribution, dividend or payment on shares of Capital Stock of
             TCR Holding (x) the proceeds of which are used to purchase Notes or
             (y) that are exchanged for Notes and (xxiv) the redemption by TCR
             Holding of equity securities pursuant to the TCR Holding
             Participating Preferred Stock Redemption..

        (ff) The definition of "Services Agreement" is hereby amended to read in
its entirety as follows:

                "Services Agreement" means the Services Agreement among TNGC
             Holdings and its Subsidiaries, as in effect on the Issue Date and
             as amended from time to time, provided that any such amendment is
             approved by the Board of Directors of each of the parties thereto
             that will be bound by such amendment.

        (gg) The definition of "Subordinated Debt" is hereby amended to read in
its entirety as follows:

                "Subordinated Debt" means Debt of TARC, TCR Holding,
             TransContinental or TransTexas that (i) requires no payment of
             principal prior to or on the date on which all principal of and
             interest on the respective Intercompany Loans is paid in full and
             (ii) is subordinate and junior in right of payment to the
             respective Intercompany Loans in the event of a liquidation.

        (hh) The definition of "Subsidiary" is hereby amended to read in its
entirety as follows:

                "Subsidiary" with respect to any Person, means (i) a corporation
             with respect to which such Person or its Subsidiaries owns,
             directly or indirectly, at least fifty percent of such
             corporation's Capital Stock with voting power, under ordinary
             circumstances, to elect directors, or (ii) a partnership in which
             such Person or a subsidiary of such Person is, at the time, a
             general partner of such partnership and has more than 50% of the
             total voting power of partnership interests entitled (without
             regard to the occurrence of any contingency) to vote in the
             election of managers thereof, or (iii) any other Person (other than
             a corporation or a partnership) in which such Person, one or more
             Subsidiaries of such Person, or such Person and one or more
             Subsidiaries of such Person, directly or indirectly, at the date of
             determination thereof has (x) at least a fifty percent ownership
             interest or (y) the power to elect or direct the election of the
             directors or other governing body of such other Person; provided,
             however, that "Subsidiary" shall not include (i) for the purposes
             of Section 4.16, a joint venture an investment in which would
             constitute a Permitted Investment under clause (ix) of the
             definition thereof, (ii) any Unrestricted Subsidiary of such
             Person, except for purposes of Section 4.10 or (iii) an Accounts
             Receivable Subsidiary; provided, further, however, that, TCR
             Holding and its subsidiaries other than TransContinental shall be
             "Subsidiaries" of TARC and the Company (except for purposes of the
             Security Documents and Section 4.16) until, but only until, payment
             in full of the TARC Intercompany Loan, and TransContinental shall
             not be a "Subsidiary" of any Person.



                                      -18-

<PAGE>   19
        (ii) The definition of "TARC Collateral" is hereby amended to read in
its entirety as follows:

                "TARC Collateral" means (x) the assets of TARC and TCR Holding
             which are mortgaged or pledged to the Company as security for the
             TARC Intercompany Loan in accordance with the TARC Security
             Documents and (y) to the extent required hereby, the Guarantees by
             the Subsidiaries of TARC of the TARC Intercompany Loan.


        (jj) A definition of "TARC Intercompany Loan Amendment" is hereby added
to the Original Indenture to read in its entirety as follows:

                "TARC Intercompany Loan Amendment" means the second amendment to
             the TARC Intercompany Loan upon substantially the terms described
             in the form attached hereto as Exhibit C.

        (kk) A definition of "TransContinental" is hereby added to the Original
Indenture to read in its entirety as follows:

                "TransContinental" means TransContinental Refining Corporation,
             a Delaware corporation, to which the Refinery Assets will be
             transferred by TCR Holding pursuant to the Transaction and, for
             purposes of Section 4.11 hereof, its Subsidiaries.

        (ll) The definition of "TARC Borrowing Base" is hereby amended to read
in its entirety as follows:

                "TransContinental Borrowing Base" means, as of any date, an
             amount equal to the sum of (a) 90% of the book value of all
             accounts receivable owned by TransContinental and its Subsidiaries
             (excluding any accounts receivable that are more than 90 days past
             due, less (without duplication) the allowance for doubtful accounts
             attributable to such current accounts receivable) calculated on a
             consolidated basis and in accordance with GAAP and (b) 85% of the
             current market value of all inventory owned by TransContinental and
             its Subsidiaries as of such date. To the extent that information is
             not available as to the amount of accounts receivable as of a
             specific date, TransContinental may utilize, to the extent
             reasonable, the most recent available information for purposes of
             calculating the TransContinental Borrowing Base.

        (mm) The definition of "TARC Security Documents" is hereby amended to 
read in its entirety as follows:

                "TARC Security Documents" means the TARC Intercompany Loan, the
             TCR Holding Pledge Agreement, the Disbursement Agreement,
             registration rights agreements relating to the shares of TARC and
             TransContinental common stock pledged to the Indenture Trustee and
             each other agreement relating to the pledge of assets to secure the
             TARC Intercompany Loan and any guarantee of the obligations of TCR
             Holding under the TARC Intercompany Loan by any Guarantor that may
             be entered into after the date of the TARC Intercompany Loan,
             pursuant to the terms of the TARC Intercompany Loan, in each case
             as amended from time to time.


                                      -19-

<PAGE>   20
        (nn) A definition of "TARC Subordinated Notes" is hereby added to the
Original Indenture to read in its entirety as follows:

                "TARC Subordinated Notes" means the 16% Series A and Series C
             Senior Subordinated Notes due 2003 issued by TARC.

        (oo) A definition of "TCR Holding" is hereby added to the Original 
Indenture to read in its entirety as follows:

                "TCR Holding" means TCR Holding Corporation, a Delaware
             corporation, to which the Refinery Assets will be transferred by
             TARC pursuant to the Transaction.

        (pp) A definition of "TCR Holding Entities" is hereby added to the
Original Indenture to read in its entirety as follows:

                "TCR Holding Entities" means TCR Holding and each of its
             Subsidiaries.


        (qq) A definition of "TCR Holding Participating Preferred Stock
Redemption" is hereby added to the Original Indenture to read in its entirety as
follows:

                "TCR Holding Participating Preferred Stock Redemption" means the
             redemption by TCR Holding of its Participating Preferred Stock
             issued pursuant to the Transaction in exchange for (i) debt
             securities of TCR Holding with an aggregate principal amount equal
             to the liquidation preference of such Participating Preferred
             Stock, with a maturity date of June 1, 2002 and bearing interest at
             a rate sufficient to pay interest on the TARC Intercompany Loan and
             the TARC Subordinated Notes and (ii) common stock of TCR Holding
             equal to 30.6% of the equity interest in TCR Holding and 41% of the
             voting power of TCR Holding's capital stock.

        (rr) A definition of "TCR Holding Pledge Agreement" is hereby added to
the Original Indenture to read in its entirety as follows:

                "TCR Holding Pledge Agreement" means the Pledge Agreement
             between TCR Holding and the Company pursuant to which TCR Holding
             pledges all of the common stock of TransContinental owned by TCR
             Holding upon consummation of the Transaction to the Company as
             security for the TARC Working Capital Loan.

        (ss) The definition of "TARC Warrants" is hereby amended to read in its
entirety as follows:

                "TARC Warrants" means the common stock purchase warrants of TARC
             issued on February 23, 1995, December 30, 1997 and March 16, 1998
             and all other common stock purchase warrants of TARC outstanding on
             the Transaction Closing Date.

        (tt) A definition of "TARC Working Capital Loan" is hereby added to the
Original Indenture to read in its entirety as follows:

                "TARC Working Capital Loan" means a loan by the Company to TARC
             of up to $50 million.

                                      -20-

<PAGE>   21

        (uu) The definition of "Tax Allocation Agreement" is hereby amended to 
read in its entirety as follows:

                "Tax Allocation Agreement" means the Tax Allocation Agreement,
             dated as of August 24, 1993, among TNGC Holdings Corporation, the
             Company and certain Subsidiaries, as in effect on the Issue Date
             and as amended from time to time, provided that any such amendment
             is approved by the Board of Directors of each of the parties
             thereto that will be bound by such amendment.

        (vv) A definition of "Transaction" is hereby added to the Original 
Indenture to read in its entirety as follows:

                "Transaction" means a series of related transactions (as more
             fully described in the Company's Consent Solicitation Statement
             dated September 30, 1998, as amended, pursuant to which consents
             were solicited from the Holders to amendments to the Indenture to
             facilitate the Transaction, which description is incorporated
             herein by reference) pursuant to which, among other things, (i) the
             Lien on the TARC Collateral is released, (ii) TARC transfers to TCR
             Holding the Refinery Assets in exchange for (x) all of the capital
             stock of TCR Holding and (y) the assumption by TCR Holding of
             certain debt and other obligations of TARC, (iii) TCR Holding
             transfers to TransContinental the Refinery Assets in exchange for
             all of the common stock of TransContinental and TransContinental
             assumes the debt and other obligations of TARC assumed by TCR
             Holding other than the TARC Working Capital Loan and (iv) certain
             Purchasers purchase (x) debt securities issued by TARC, (y) equity
             securities issued by TransContinental and (z) TCR Holding capital
             stock from TARC for aggregate gross proceeds of approximately $151
             million.

        (ww) A definition of "Transaction Closing Date" is hereby added to the
Original Indenture to read in its entirety as follows:

                "Transaction Closing Date" means the date the Refinery Assets
             are transferred by TARC to TCR Holding and by TCR Holding to
             TransContinental pursuant to the Transaction.

        (xx) A definition of "TransTexas Intercompany Loan Amendment" is hereby
added to the Original Indenture to read in its entirety as follows:

                "TransTexas Intercompany Loan Amendment" means the second
             amendment to the TransTexas Intercompany Loan upon substantially
             the terms described in the form attached hereto as Exhibit D.



                                      -21-

<PAGE>   22
        (yy) A definition of "TransTexas Security Agreement Amendment" is
hereby added to the Original Indenture to read in its entirety as follows:

                "TransTexas Security Agreement Amendment" means the first
             amendment to the TransTexas Security Agreement upon substantially
             the terms described in the form attached hereto as Exhibit E.

        (zz) The definition of "Unrestricted Non-Recourse Debt" is hereby
amended to read in its entirety as follows:

                "Unrestricted Non-Recourse Debt" of the Company or any of its
             Subsidiaries means (i) Debt of such Person that is secured solely
             (other than with respect to clause (ii) below) by a Lien upon the
             stock of an Unrestricted Subsidiary of such Person and as to which
             there is no recourse (other than with respect to clause (ii) below)
             against such Person or any of its assets other than against such
             stock (and the dollar amount of any Debt of such Person as
             described in this clause (i) shall be deemed to be zero for
             purposes of all other provisions of the Indenture) and (ii)
             guarantees of the Debt of Unrestricted Subsidiaries of such Person;
             provided, that the aggregate of all Debt of such Person Incurred
             and outstanding pursuant to clause (ii) of this definition,
             together with all Permitted Investments (net of any return on such
             Investment) in Unrestricted Subsidiaries of such Person, does not
             exceed (x) (w)$25,000,000 in the case of TransTexas, (x) 20% of
             TARC's Consolidated EBITDA since the Phase II Completion Date in
             the case of TARC, (y) 20% of TCR Holding's Consolidated EBITDA
             since the Phase II Completion Date in the case of TCR Holding or
             (z) 20% of TransContinental's consolidated EBITDA since the Phase
             II Completion Date in the case of TransContinental plus in the case
             of clause (ii) of this definition of Unrestricted Non- Recourse
             Debt, Restricted Payments permitted to be made pursuant to clauses
             (i) or (ii), as applicable, of Section 4.3.

        Section 1.02. Section 4.3 of the Original Indenture. Section 4.3 of the
Original Indenture is hereby amended to read in its entirety as follows:

                Section 4.3 Limitation on Restricted Payments. The Company shall
             not, and shall not permit any of its Subsidiaries (other than any
             of the TTXD Entities after the TTXD Spin- off) to, directly or
             indirectly, make any dividend or other distribution on shares of
             Capital Stock of the Company or any Subsidiary of the Company or
             make any payment on account of the purchase, redemption, or other
             acquisition or retirement for value of any such shares of Capital
             Stock (except (x) to TransTexas by any of its Subsidiaries or (y)
             to TARC by any of its Subsidiaries) unless such dividends,
             distributions, or payments are made in cash or Capital Stock or a
             combination thereof (other than the TTXD Spin-off or a dividend of
             the common stock of TransTexas by TARC to the Company). In
             addition, the Company shall not, and shall not permit any of its
             Subsidiaries (other than any of the TTXD Entities after the TTXD
             Spin-off) to, directly or indirectly, make any Restricted Payment;
             provided, however, that TransTexas, TARC or TCR Holding may make a
             Restricted Payment if, at the time or after giving effect thereto
             on a pro forma basis no Default or Event of Default would occur or
             be continuing, and:

             (i)  in the case of Restricted Payments by TransTexas:

                         (a) the Consolidated Fixed Charge Coverage Ratio of 
                  TransTexas exceeds 2.25 to 1;


                                      -22-

<PAGE>   23
                         (b) TransTexas' Adjusted Consolidated Tangible Assets
                  are equal to or greater than 150% of the total consolidated
                  principal amount or accreted value, as the case may be, of
                  Debt of TransTexas and its Subsidiaries (excluding, for
                  purposes of the calculation of Debt, any Swap Obligations);
                  and

                         (c) the aggregate amount of all Restricted Payments
                  made by TransTexas and its Subsidiaries, including such
                  proposed Restricted Payment and all payments that may be made
                  pursuant to the proviso at the end of this sentence (if not
                  made in cash, then the fair market value of any property used
                  therefor) from and after the Issue Date and on or prior to the
                  date of such Restricted Payment, would not exceed the sum of
                  (x) 25% of Adjusted Consolidated Net Income of TransTexas
                  accrued for the period (taken as one accounting period),
                  commencing with the first full fiscal quarter that commenced
                  after the Issue Date, to and including the fiscal quarter
                  ended immediately prior to the date of each calculation (or,
                  in the event Adjusted Consolidated Net Income for such period
                  is a deficit, then minus 100% of such deficit), minus (y) 100%
                  of the amount of any write-downs, write-offs, other negative
                  revaluations, and other negative extraordinary charges not
                  otherwise reflected in Adjusted Consolidated Net Income of
                  TransTexas during such period, plus (z) the aggregate Net
                  Proceeds received by TransTexas from the issuance or sale
                  (other than to the Company or a Subsidiary of the Company) of
                  its Qualified Capital Stock from and after the Issue Date and
                  on or prior to the date of such Restricted Payment); or

             (ii) in the case of Restricted Payments by TARC:

                         (a) TARC's Consolidated Fixed Charge Coverage Ratio
                  exceeds 2.25 to 1; and

                         (b) the aggregate amount of all Restricted Payments
                  made by all of the TARC Entities, including such proposed
                  Restricted Payment and all payments that may be made pursuant
                  to the proviso at the end of this sentence (if not made in
                  cash, then the fair market value of any property used
                  therefor), from and after the Issue Date and on or prior to
                  the date of such Restricted Payment, would not exceed an
                  amount equal to (x) 25% of Adjusted Consolidated Net Income of
                  TARC accrued for the period (taken as one accounting period)
                  from the first full fiscal quarter that commenced after the
                  Issue Date to and including the fiscal quarter ended
                  immediately prior to the date of each calculation for which
                  financial statements are available (or, if TARC's Adjusted
                  Consolidated Net Income for such period is a deficit, then
                  minus 100% of such deficit), plus (y) the aggregate Net
                  Proceeds received by TARC from the issuance or sale (other
                  than to the Company or a Subsidiary of the Company) of its
                  Qualified Capital Stock from and after the Issue Date and on
                  or prior to the date of such Restricted Payment, minus (z)
                  100% of the amount of any write-downs, write-offs, other
                  negative revaluations, and other negative extraordinary
                  charges not otherwise reflected in TARC's Adjusted
                  Consolidated Net Income during such period; or


                                      -23-

<PAGE>   24
            (iii) in the case of Restricted Payments by TCR Holding:

                         (a) TCR Holding's Consolidated Fixed Charge Coverage
                  Ratio exceeds 2.25 to 1; and

                         (b) the aggregate amount of all Restricted Payments
                  made by all of the TCR Holding Entities, including such
                  proposed Restricted Payment and all payments that may be made
                  pursuant to the proviso at the end of this sentence (if not
                  made in cash, then the fair market value of any property used
                  therefor), from and after the Transaction Closing Date and on
                  or prior to the date of such Restricted Payment, would not
                  exceed an amount equal to the sum of (w) $1,000,000, plus (x)
                  50% of Adjusted Consolidated Net Income of TCR Holding accrued
                  for the period (taken as one accounting period) from the first
                  full fiscal quarter that commenced after the Transaction
                  Closing Date to and including the fiscal quarter ended
                  immediately prior to the date of each calculation for which
                  financial statements are available (or, if TCR Holding's
                  Adjusted Consolidated Net Income for such period is a deficit,
                  then minus 100% of such deficit), plus (y) the aggregate Net
                  Proceeds received by TCR Holding from the issuance or sale
                  (other than to the Company or a Subsidiary of the Company) of
                  its Qualified Capital Stock from and after the Transaction
                  Closing Date and on or prior to the date of such Restricted
                  Payment, minus (z) 100% of the amount of any write-downs,
                  write-offs, other negative revaluations, and other negative
                  extraordinary charges not otherwise reflected in TCR Holding's
                  Adjusted Consolidated Net Income during such period;

                  provided, that nothing in this Section 4.3 shall prohibit the 
                  payment of any dividend within 60 days after the date of its 
                  declaration if such dividend could have been made on the date 
                  of its declaration in compliance with the foregoing
                  provisions.

    Section 1.03. Section 4.6 of the Original Indenture. Section 4.6(b) of
the Original Indenture is hereby amended to read in its entirety as follows:

                  (b) Each of the Company and its Subsidiaries shall provide, or
          shall cause to be provided, for itself and each of its Subsidiaries,
          insurance (including appropriate self-insurance) against loss or
          damage of the kinds that, in its reasonable, good faith opinion, are
          adequate and appropriate for the conduct of its business and the
          business of such Subsidiaries in a prudent manner, with reputable
          insurers or with the government of the United States of America or an
          agency or instrumentality thereof, in such amounts, with such
          deductibles, and by such methods as is customary, in its reasonable,
          good faith opinion, and adequate and appropriate for the conduct of
          its business and the business of its Subsidiaries in a prudent manner
          for companies engaged in a similar business. In addition, all such
          insurance shall be payable to the Trustee as loss payee, as its
          interests may appear, under a "standard" or "Texas" loss payee clause.
          Without limiting the foregoing, each of the Company and its
          Subsidiaries shall (i) keep all of its physical property insured with
          hazard insurance on an "all risks" basis, with broad form flood and
          earthquake coverages and electronic data processing coverage, with a
          full replacement cost endorsement and an "agreed amount" clause in an
          amount equal to 100% of the full replacement cost of such property,
          (ii) maintain all such workers' compensation or similar insurance as
          may be required by law and (iii) maintain, in amounts and with
          deductibles

                                      -24-

<PAGE>   25
          equal to those generally maintained by businesses engaged in similar 
          activities in similar geographic areas, general public liability 
          insurance against claims of bodily injury, death or property damage 
          occurring on, in or about the properties of the Company and its 
          Subsidiaries.

    Section 1.04. Section 4.7 of the Original Indenture. Section 4.7(d) of the 
Original Indenture is hereby deleted.

    Section 1.05. Section 4.10 of the Original Indenture.

    (a)   Section 4.10(a) of the Original Indenture is hereby amended to read in
    its entirety as follows:


                  (a) The Company shall not, and shall not permit any of its
          Subsidiaries (other than any of the TTXD Entities after the date of
          the TTXD Spin-off) to, enter directly or indirectly into, or permit to
          exist, any transaction or series of related transactions with any
          Related Person (excluding any Related Person which is a Related Person
          solely because the party engaging in such transaction has the ability
          to control the Related Person under the definition of "Control"
          contained within the definition of "Related Person") (including,
          without limitation: (i) the sale, lease, transfer or other disposition
          of properties, assets or securities to such Related Person, (ii) the
          purchase or lease of any property, assets or securities from such
          Related Person, (iii) an Investment in such Related Person (excluding
          Investments permitted to be made pursuant to clauses (iii), (vi),
          (viii), (x), (xii), (xiii), (xv), (xvi), (xvii), (xix), (xx), (xxii),
          (xxiii), (xxiv), (xxvi) or (xxix) of the definition of "Permitted
          Investment"), and (iv) entering into or amending any contract or
          agreement with or for the benefit of a Related Person (each, a
          "Related Person Transaction")), except for (A) permitted Restricted
          Payments, including for this purpose the transactions excluded from
          the definition of Restricted Payments by the proviso contained in the
          definition of "Restricted Payments", (B) transactions made in good
          faith, the terms of which are (x) fair and reasonable to the Company
          or such Subsidiary, as the case may be, and (y) at least as favorable
          as the terms which could be obtained by the Company or such
          Subsidiary, as the case may be, in a comparable transaction made on an
          arm's length basis with Persons who are not Related Persons, (C)
          transactions, (w) between the Company and any of its Wholly Owned
          Subsidiaries or transactions between Wholly Owned Subsidiaries of the
          Company, (x) among the TTXD Entities, (y) among the TARC Entities, or
          (z) among the TransTexas Entities, (D) transactions pursuant to the
          Services Agreement, the Tax Allocation Agreement, the Gas Purchase
          Agreement, including amendments thereto that are approved by each of
          the parties thereto, the Intercompany Loans, the Security Documents,
          the Transfer Agreement and the Registration Rights Agreements, (E) the
          lease of office space to the Company or an Affiliate of the Company by
          TransAmerican or an Affiliate of TransAmerican, provided that payments
          thereunder do not exceed in the aggregate $2,000,000 per year, (F) any
          sale and leaseback or other transfer of TransTexas' headquarters
          building located at 1300 North Sam Houston Parkway East, Houston,
          Texas, (G) any employee compensation arrangement in an amount which
          together with the amount of all other cash compensation paid to such
          employee by the Company and its Subsidiaries does not provide for cash
          compensation in excess of $2,000,000 in any fiscal year of the Company
          or any Subsidiary and which has been approved by a majority of the
          Company's

                                      -25-

<PAGE>   26

          Independent Directors and found in good faith by such directors to be
          in the best interests of the Company or such Subsidiary, as the case
          may be, (H) loans to TARC, TCR Holding and TransTexas which are
          permitted to be Incurred pursuant to the terms of Section 4.11; (I)
          the amounts payable by the Company and its Subsidiaries to Southeast
          Contractors for employee services provided to TARC or TransContinental
          not exceeding the actual costs to Southeast Contractors of the
          employees, which costs consist solely of payroll and employee
          benefits, plus related administrative costs and an administrative fee,
          not exceeding $2,000,000 per year in the aggregate; (J) the Company
          and its Subsidiaries may pay a management fee to TransAmerican in an
          amount not to exceed $2,500,000 per year; (K) transactions effected
          pursuant to the Bridge Financing Transaction, including without
          limitation (w) the borrowing by TARC from the Company of up to $25
          million on substantially the same terms as the Bridge Loan Notes, (x)
          the repayment thereof, (y) the pledge of the TARC Collateral as
          security therefor and (z) the execution, delivery and performance of
          an agreement pursuant to which the Company would direct TransTexas to
          make payments on the TransTexas Intercompany Loan, during the period
          that the Bridge Loan Notes remain outstanding, to an account which
          will be dedicated to payments on the Bridge Loan Notes; (L)
          transactions effected pursuant to the Transaction, including without
          limitation (i) the execution, delivery and performance of the TARC
          Intercompany Loan Amendment, the TransTexas Intercompany Loan
          Amendment, the TransTexas Security Agreement Amendment, the TCR
          Holding Pledge Agreement, an amendment of the Services Agreement and a
          Stock Purchase Agreement among TARC, TCR Holding, TransContinental,
          the Company and certain of the Purchasers providing for the sale to
          such Purchasers of Capital Stock of TCR Holding owned by TARC pursuant
          to the Transaction, (ii) the transfer of the Refinery Assets by TARC
          to TCR Holding and, as consideration therefor, the issuance by TCR
          Holding to TARC of Capital Stock of TCR Holding, the assumption by TCR
          Holding of certain debt and obligations of TARC (including Debt of
          TARC to the Purchasers and certain others), and (iii) the transfer of
          the Refinery Assets by TCR Holding to TransContinental and, as
          consideration therefor, the issuance by TransContinental of its common
          stock to TCR Holding and the assumption by TransContinental of certain
          debt and obligations of TCR Holding; (M) the delivery of Notes to the
          Company in satisfaction of the TARC Intercompany Loan; (N) the
          issuance and sale of the TCR Holding Participating Preferred Stock;
          (O) the delivery by TransTexas of Notes to the Company in satisfaction
          of the TransTexas Intercompany Loan, and the delivery of such Notes to
          the Company in partial satisfaction of the TransTexas Intercompany
          Loan; (P) transactions between or among TCR Holding or
          TransContinental and any of their respective Related Persons, provided
          such transaction is approved by the Board of Directors of each of the
          parties thereto; and (Q) the TCR Holding Participating Preferred Stock
          Redemption.

          Notwithstanding the foregoing, the Company shall not, and shall not
          permit any of its Subsidiaries to, directly or indirectly (excluding
          clauses (I) and (J) of Section 4.10(a)), loan or advance any funds to
          John R. Stanley, and the aggregate amount of total compensation to
          John R. Stanley shall not exceed (i) $1,000,000 per year in the
          aggregate from the Company and TransTexas and (ii) $1,000,000 in the
          aggregate from TARC and TCR Holding.

    (b)   Section 4.10(b) of the Original Indenture is hereby amended to read in
          its entirety as follows:

                                      -26-

<PAGE>   27
                  (b) Without limiting the foregoing, except for sales of
          accounts receivable to an Accounts Receivable Subsidiary in accordance
          with Section 4.20, (i) with respect to any Related Person Transaction
          or series of Related Person Transactions (other than any Related
          Person Transaction described in clause (A) (with respect to Permitted
          Restricted Payments by virtue of clauses (i), (ii), (iv)-(xii), (xiv),
          (xv), (xvi) and (xvii) of the proviso contained in the definition of
          "Restricted Payments"), (C), (D), (E), (F), (H), (K), (L), (M), (N),
          (O), (P) or (Q) of Section 4.10(a)) with an aggregate value in excess
          of $1,000,000, such transaction must first be approved by a majority
          of the Board of Directors of the Company or its Subsidiary which is
          the transacting party and a majority of the directors of such entity
          who are disinterested in the transaction pursuant to a Board
          Resolution, as (x) fair and reasonable to the Company or such
          Subsidiary, as the case may be, and (y) on terms which are at least as
          favorable as the terms which could be obtained by the Company or such
          Subsidiary, as the case may be, on an arm's length basis with Persons
          who are not Related Persons, and (ii) with respect to any Related
          Person Transaction or series of related Person Transactions (other
          than any Related Person Transaction described in clause (A) (with
          respect to permitted Restricted Payments by virtue of clauses (i),
          (ii), (iv)-(xii), (xiv), (xv), (xvi) and (xvii) of the proviso
          contained in the definition of "Restricted Payments") (C), (D), (E),
          (F), (G), (H), (K), (L), (M), (N), (O), (P) or (Q) of Section 4.10(a))
          with an aggregate value in excess of $5,000,000, the Company must
          first obtain a favorable written opinion as to the fairness of such
          transaction to the Company or such Subsidiary, as the case may be,
          from a financial point of view, from a nationally recognized
          investment banking or accounting firm; provided that such opinion
          shall not be necessary if approval of the Board of Directors to such
          Related Person Transaction has been obtained after receipt of bona
          fide bids of at least two other independent parties and such Related
          Person Transaction is in the ordinary course of business.

    Section 1.06. Section 4.11 of the Original Indenture.

    (a)   The first paragraph of Section 4.11 of the Original Indenture is 
    hereby amended to read in its entirety as follows:

                  Section 4.11 Limitation on Incurrences of Additional Debt and
          Issuances of Disqualified Capital Stock. Except as set forth in this
          Section 4.11, from and after the Issue Date, the Company shall not,
          and shall not permit any of its Subsidiaries or TransContinental
          (other than any of the TTXD Entities after the TTXD Spin-off) to,
          directly or indirectly, create, incur, assume, guarantee, or otherwise
          become liable for, contingently or otherwise (to "Incur" or, as
          appropriate, an "Incurrence"), any Debt or issue any Disqualified
          Capital Stock, except:

    (b)   Section 4.11(1)(g) of the Original Indenture is hereby amended to
    read in its entirety as follows:

                  (g) TransTexas may Incur Debt as an extension, renewal,
          replacement, or refunding of any item of the Debt permitted to be
          Incurred by clauses (m) or (o) hereof, or this clause (g) (each such
          item of Debt is referred to as "Pre-Phase I TransTexas Refinancing
          Debt"), provided, that (1) the maximum principal amount of each item
          of Pre-Phase I TransTexas Refinancing Debt (or, if such Pre-Phase I
          TransTexas Refinancing Debt is issued with


                                      -27-

<PAGE>   28
          original issue discount, the original issue price of such Pre-Phase I
          TransTexas Refinancing Debt) permitted under this clause (g) may not
          exceed the lesser of (x) the principal amount of the item of Debt
          being extended, renewed, replaced, or refunded plus reasonable
          financing fees and other associated reasonable out-of-pocket expenses
          including consent payments, premium, if any, and related fees, in each
          case other than those paid to a Related Person (collectively,
          "Refinancing Fees"), or (y) if such item of Debt being extended,
          renewed, replaced, or refunded was issued at an original issue
          discount, the original issue price, plus amortization of the original
          issue discount as of the time of the Incurrence of the Pre-Phase I
          TransTexas Refinancing Debt plus Refinancing Fees, (2) each item of
          Pre- Phase I TransTexas Refinancing Debt has a Weighted Average Life
          and a final maturity that is equal to or greater than the related Debt
          being extended, renewed, replaced, or refunded at the time of such
          extension, renewal, replacement, or refunding and (3) each item of
          Pre- Phase I TransTexas Refinancing Debt shall rank with respect to
          the Notes and the TransTexas Intercompany Loan to an extent no less
          favorable in respect thereof to the Holders than the related Debt
          being refinanced;

   (c) Section 4.11(1)(r) of the Original Indenture is hereby amended to read in
   its entirety as follows:

                  (r) Debt of TransTexas owed to the Company which together with
          any Debt incurred pursuant to clauses (2)(p), (3)(v) and (4)(t) hereof
          does not in the aggregate exceed $50,000,000 principal amount
          outstanding at any one time; provided that such Debt must have a
          maturity date which is not after the maturity date of the Notes; and
          provided further, that such loan must bear cash interest at a rate of
          11.616% per annum.

    (d) The first paragraph of Section 4.11(2) of the Original Indenture is 
    hereby amended to read in its entirety as follows:

                  (2) in the case of TARC, TCR Holding, TransContinental or any
          of their Subsidiaries prior to the earlier to occur of (x) the Phase I
          Completion Date or (y) the Notes being rated "B2" or better by Moody's
          Investors Services, Inc. or "BB" or better by Standard and Poor's
          Corporation, Inc.:

    (e) Section 4.11(2)(b) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (b) Subordinated Debt of TARC solely to any wholly owned
          Subsidiary of TARC, Debt of TCR Holding solely to TransContinental or
          any wholly owned Subsidiary of TCR Holding, Debt or Disqualified
          Capital Stock of TCR Holding to TARC, Debt of any wholly owned
          Subsidiary of TARC solely to TARC or to any wholly owned Subsidiary of
          TARC or Debt of TransContinental or any wholly owned Subsidiary of TCR
          Holding solely to TCR Holding or to any wholly owned Subsidiary of TCR
          Holding;



                                      -28-

<PAGE>   29
    (f) Section 4.11(2)(c) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (c) Debt of TransContinental outstanding at any time in an
          aggregate principal amount not to exceed the greater of (x)
          $100,000,000 or (y) the TransContinental Borrowing Base, less, in each
          case, the amount of any Debt of an Accounts Receivable Subsidiary
          (other than Debt owed to TransContinental).

    (g) Section 4.11(2)(h) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (h) Debt represented by trade payables or accrued expenses, in
          each case, incurred on normal, customary terms in the ordinary course
          of business, not overdue for a period of more than 90 days (or, if
          overdue for a period of more than 90 days, being contested in good
          faith and by appropriate proceedings and adequate reserves with
          respect thereto being maintained on the books of the obligor thereon
          in accordance with GAAP) and not constituting any amounts due to banks
          or other financial institutions;

    (h) Section 4.11(2)(i) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (i) Swap Obligations;

    (i) Section 4.11(2)(j) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (j) Unrestricted Non-Recourse Debt;

    (j) Section 4.11(2)(p) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (p) Debt of TARC, TCR Holding or TransContinental owed to the
          Company which together with any Debt Incurred pursuant to clauses
          (1)(r), (3)(v) and (4)(t) hereof does not in the aggregate exceed
          $50,000,000 principal amount outstanding at any one time; provided
          that such Debt must have a maturity date which is not after the
          maturity date of the Notes; and provided further, that such loan must
          bear cash interest at the rate of 11.616% per annum;

    (k) Section 4.11(2)(q) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (q) each of TARC, TCR Holding and TransContinental may Incur
          Debt as an extension, renewal, replacement, or refunding of any item
          of the Debt permitted to be Incurred by clauses (e), (1), (r), (v),
          (w) or (x) hereof, or this clause (q) (each such item of Debt is
          referred to as "Pre-Phase I TARC Refinancing Debt"), provided, that
          (1) the maximum principal amount of each item of Pre-Phase I TARC
          Refinancing Debt (or, if such Pre-Phase I TARC Refinancing Debt is
          issued with original issue discount, the original issue price of such
          Pre-Phase I TARC Refinancing Debt) permitted under this clause (q) may
          not exceed the lesser of (x) the principal amount of the item of Debt
          being extended, renewed, replaced, or refunded plus Refinancing Fees
          or (y) if such item of Debt being

                                      -29-

<PAGE>   30
          extended, renewed, replaced, or refunded was issued at an original
          issue discount, the original issue price, plus amortization of the
          original issue discount as of the time of the Incurrence of the
          Pre-Phase I TARC Refinancing Debt plus Refinancing Fees, (2) each item
          of Pre-Phase I TARC Refinancing Debt has a Weighted Average Life and a
          final maturity that is equal to or greater than the related Debt being
          extended, renewed, replaced, or refunded at the time of such
          extension, renewal, replacement, or refunding and (3) each item of
          Pre-Phase I TARC Refinancing Debt shall rank with respect to the Notes
          and the TARC Intercompany Loan to an extent no less favorable in
          respect thereof to the Holders than the Related Debt being refinanced;

    (l) Section 4.11(2) of the Original Indenture is hereby amended to add 
    subsections (t), (u), (v) (w), (x) and (y) thereto to read as follows:

                  (t) Debt of TARC, TCR Holding or TransContinental with an
          aggregate principal amount outstanding at any one time of up to
          $225,000,000;

                  (u) Debt of TARC which is assumed by TCR Holding or
          TransContinental in connection with the Transaction;

                  (v) Subordinated Debt of TCR Holding with an aggregate
          principal amount outstanding at any one time not in excess of
          $200,000,000;

                  (w) Debt of TCR Holding (other than Debt incurred pursuant to
          clause (t) above) which is assumed by TransContinental in connection
          with the Transaction;

                  (x) Disqualified Capital Stock of TCR Holding or
          TransContinental or unsecured Debt of TCR Holding or unsecured or
          secured Debt of TransContinental (x) the proceeds of which are used to
          repurchase Notes or (y) that is exchanged for Notes; and

                  (y) Debt or Disqualified Capital Stock of TCR Holding or
          TransContinental that is used to refinance or replace the TARC
          Intercompany Loan.

    (m) Section 4.11(3)(j) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (j) TransTexas may Incur Debt as an extension, renewal,
          replacement, or refunding of any item of the Debt permitted to be
          Incurred by clauses (c), (j), (q) or (s) hereof, or the third
          paragraph of this section or Debt permitted to be refinanced pursuant
          to clause (l) (g) hereof (each such item of Debt is referred to as
          "TransTexas Refinancing Debt"), provided, that (1) the maximum
          principal amount of each item of TransTexas Refinancing Debt (or, if
          such TransTexas Refinancing Debt is issued with original issue
          discount, the original issue price of such TransTexas Refinancing
          Debt) permitted under this subclause (j) may not exceed the lesser of
          (x) the principal amount of the Debt being extended, renewed,
          replaced, or refunded plus Refinancing Fees, or (y) if such Debt being
          extended, renewed, replaced, or refunded was issued at an original
          issue discount, the original issue price, plus amortization of the
          original issue discount as of the time of the Incurrence of the
          TransTexas Refinancing Debt plus Refinancing Fees, (2) each item of
          TransTexas


                                      -30-

<PAGE>   31
          Refinancing Debt has a Weighted Average Life and a final maturity that
          is equal to or greater than the related Debt being extended, renewed,
          replaced, or refunded at the time of such extension, renewal,
          replacement, or refunding and (3) each item of TransTexas Refinancing
          Debt shall rank with respect to the Notes and the TransTexas
          Intercompany Loan to an extent no less favorable in respect thereof to
          the Holders than the related Debt being refinanced;

    (n) Section 4.11(3)(v) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (v) Debt of TransTexas owed to the Company which together with
          any Debt Incurred pursuant to clauses (1)(r), (2)(p) and (4)(t) hereof
          does not in the aggregate exceed $50,000,000 principal amount
          outstanding at any one time; provided that such Debt must have a
          maturity date which is not after the maturity date of the Notes; and
          provided further, that such loan must bear cash interest at a rate of
          11.616% interest per annum.

    (o) The first paragraph of Section 4.11(4) of the Original Indenture is 
    hereby amended to read in its entirety as follows:

                  (4) in the case of TARC, TCR Holding, TransContinental or any
          of their Subsidiaries after the earlier to occur of (x) the Phase I
          Completion Date or (y) the Notes being rated "B2" or better by Moody's
          Investors Services, Inc. or "BB--" or better by Standard and Poor's
          Corporation, Inc.:

    (p) Section 4.11(4)(b) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (b) Subordinated Debt of TARC solely to any wholly owned
          Subsidiary of TARC, Debt of TCR Holding solely to TransContinental or
          any wholly owned Subsidiary of TCR Holding, Debt or Disqualified
          Capital Stock of TCR Holding to TARC, Debt of any wholly owned
          Subsidiary of TARC solely to TARC or to any wholly owned Subsidiary of
          TARC or Debt of any wholly owned Subsidiary of TCR Holding solely to
          TransContinental or TCR Holding or to any wholly owned Subsidiary of
          TCR Holding;

    (q) Section 4.11(4)(d) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (d) Debt of TransContinental outstanding at any time in an
          aggregate principal amount not to exceed the greater of (x)
          $100,000,000 or (y) the TransContinental Borrowing Base, less, in each
          case, the amount of any Debt of an Accounts Receivable Subsidiary
          (other than Debt owed to TransContinental) and any Debt outstanding
          pursuant to clause (c) of clause (2) above;



                                      -31-

<PAGE>   32
    (r) Section 4.11(4)(j) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (j) each of TARC, TCR Holding and TransContinental may Incur
          Debt as an extension, renewal, replacement, or refunding of any item
          of the Debt permitted to be Incurred by clauses (c) or (g) above, the
          fourth paragraph of this section, this clause (j), clauses (o), (r),
          (x), (y) or (z) below or Debt permitted to be refinanced pursuant to
          clause (2)(q) hereof (each such item of Debt is referred to as "TARC
          Refinancing Debt"), provided that (1) the maximum principal amount of
          each item of TARC Refinancing Debt (or, if such TARC Refinancing Debt
          is issued with original issue discount, the original issue price of
          such TARC Refinancing Debt) permitted under this clause (j) may not
          exceed the lesser of (x) the principal amount of the item of Debt
          being extended, renewed, replaced, or refunded plus Refinancing Fees,
          or (y) if such item of Debt being extended, renewed, replaced, or
          refunded was issued at an original issue discount, the original issue
          price, plus amortization of the original issue discount at the time of
          the Incurrence of the TARC Refinancing Debt plus Refinancing Fees, (2)
          each item of TARC Refinancing Debt has a Weighted Average Life and a
          final maturity that is equal to or greater than the related Debt being
          extended, renewed, replaced. or refunded at the time of such
          extension, renewal, replacement, or refunding and (3) each item of
          TARC Refinancing Debt shall rank with respect to the Notes and the
          TARC Intercompany Loan to an extent no less favorable in respect
          thereof to the Holders than the related Debt being refinanced;

     (s) Section 4.11(4)(k) of the Original Indenture is hereby amended to read
     in its entirety as follows:

                  (k) Debt represented by trade payables or accrued expenses, in
          each case, incurred on normal, customary terms in the ordinary course
          of business, not overdue for a period of more than 90 days (or, if
          overdue for a period of more than 90 days, being contested in good
          faith and by appropriate proceedings and adequate reserves with
          respect thereto being maintained on the books of the obligor thereon
          in accordance with GAAP) and not constituting any amounts due to banks
          or other financial institutions;

     (t) Section 4.11(4)(l) of the Original Indenture is hereby amended to read
     in its entirety as follows:

                  (l) Swap Obligations;

     (u) Section 4.11(4)(m) of the Original Indenture is hereby amended to read
     in its entirety as follows:

                  (m) Unrestricted Non-Recourse Debt;

     (v) Section 4.11(4)(r) of the Original Indenture is hereby amended to read
     in its entirety as follows:

                  (r) Debt of TransContinental Incurred in connection with the
          acquisition, construction or improvement of a CATOFIN(R) Unit not in
          excess of 20% of TransContinental's Consolidated EBITDA accrued for
          the period (taken as one accounting period) commencing with the first
          full fiscal quarter that commenced after the Phase I Completion Date,
          to and including the fiscal quarter ended immediately prior to the
          date

                                      -32-

<PAGE>   33

          of such calculation, provided, that, no such Debt may be Incurred
          unless (i) the Phase II Completion Date has occurred or (ii) the
          Construction Supervisor shall have provided the Trustee with written
          certification that, based upon its bi-monthly evaluation of the
          Capital Improvement Program, the amounts remaining in the disbursement
          accounts to complete Phase II are sufficient to complete Phase II in
          accordance with the Plans approved by the Construction Supervisor;

     (w) Sections 4.11(4)(s) and (t) of the Original Indenture are hereby
     amended to read in their entirety as follows:

                  (s) Debt of TARC or any of its Subsidiaries owed to the
          Company which is loaned pursuant to terms of the fourth paragraph of
          either Section 4.21 or 4.24;

                  (t) Debt of TARC, TCR Holding or TransContinental owed to the
          Company which together with any Debt Incurred pursuant to clauses
          (1)(r), (2)(p) and (3)(v) hereof does not in the aggregate exceed
          $50,000,000 principal amount outstanding at any one time; provided
          that such Debt must have a maturity date which is not after the
          maturity date of the Notes; and provided further, that such loan must
          bear cash interest at the rate of 11.616% per annum;

     (x) Section 4.11(4) of the Original Indenture is hereby amended to add
     subsections (u), (v), (w), (x) (y) and (z) to read in their entirety as
     follows:

                  (u) Debt of TransContinental with an aggregate principal
          amount of up to $225,000,000 outstanding at any one time;

                  (v) Debt of TARC which is assumed by TCR Holding or
          TransContinental in connection with the Transaction;

                  (w) Subordinated Debt of TCR Holding with an aggregate
          principal amount outstanding at any one time not in excess of
          $200,000,000;

                  (x) Debt of TCR Holding (other than Debt incurred pursuant to
          clause (u) above) which is assumed by TransContinental in connection
          with the Transaction;

                  (y) Disqualified Capital Stock of TCR Holding or
          TransContinental or unsecured Debt of TCR Holding or unsecured or
          secured Debt of TransContinental (x) the proceeds of which are used to
          repurchase Notes or (y) that is exchanged for Notes; and

                  (z) Debt or Disqualified Capital Stock of TCR Holding or
          TransContinental that is used to refinance or replace the TARC
          Intercompany Loan.

     (y) Section 4.11(5)(e) of the Original Indenture is hereby amended to read
     in its entirety as follows:

                  (e) The Company may Incur Debt as an extension, renewal,
          replacement, or refunding of any item of the Debt permitted to be
          Incurred by subclauses (d) hereof, or this

                                      -33-

<PAGE>   34
          subclause (e) (each such item of Debt is referred to as "TEC
          Refinancing Debt"), provided, that (1) the maximum principal amount of
          each item of TEC Refinancing Debt (or, if such TEC Refinancing Debt is
          issued with original issue discount, the original issue price of such
          Refinancing Debt) permitted under this subclause (e) may not exceed
          the lesser of (x) the principal amount of the item of Debt being
          extended, renewed, replaced, or refunded plus Refinancing Fees, or (y)
          if such item of Debt being extended, renewed, replaced, or refunded
          was issued at an original issue discount, the original issue price,
          plus amortization of the original issue discount as of the time of the
          Incurrence of the TEC Refinancing Debt plus Refinancing Fees, (2) each
          item of TEC Refinancing Debt has a Weighted Average Life and a final
          maturity that is equal to or greater than the related Debt being
          extended, renewed, replaced, or refunded at the time of such
          extension, renewal, replacement, or refunding and (3) each item of TEC
          Refinancing Debt shall rank with respect to the Notes to an extent no
          less favorable in respect thereof to the Holders than the related Debt
          being refinanced.

     (z) The third to last and second to last paragraphs of Section 4.11 of the
     Original Indenture are hereby amended to read in their entirety as follows:

                  Notwithstanding the foregoing provisions of this covenant, (a)
          TARC, TCR Holding and TransContinental may Incur Senior Debt and TARC,
          TCR Holding and TransContinental may issue Disqualified Capital Stock
          if, at the time such Senior Debt is Incurred or such Disqualified
          Capital Stock is issued, (i) no Default or Event of Default shall have
          occurred and be continuing at the time or immediately after giving
          effect to such transaction on a pro forma basis, and (ii) immediately
          after giving effect to the Consolidated Fixed Charges in respect of
          such Debt being Incurred or such Disqualified Capital Stock being
          issued and the application of the proceeds therefrom to the extent
          used to reduce Debt or Disqualified Capital Stock, on a pro forma
          basis, the Consolidated Fixed Charge Coverage Ratio of the entity
          incurring such Debt for the Reference Period is greater than 2.5 to 1,
          and (b) TARC, TCR Holding and TransContinental may Incur Subordinated
          Debt if, at the time such Subordinated Debt is incurred, (i) no
          Default or Event of Default shall have occurred and be continuing at
          the time or immediately after giving effect to such transaction on a
          pro forma basis, and (ii) immediately after giving effect to the
          Consolidated Fixed Charges in respect of such Subordinated Debt being
          incurred and the application of the proceeds therefrom to the extent
          used to reduce Debt, on a pro forma basis, the Consolidated Fixed
          Charge Coverage Ratio of the entity incurring such Debt for the
          Reference Period is greater than 2.0 to 1.

                  Debt Incurred and Disqualified Capital Stock issued by any
          Person that is not a Subsidiary of TransTexas, TARC, TCR Holding or
          TransContinental, as the case may be, which Debt or Disqualified
          Capital Stock is outstanding at the time such Person becomes a
          Subsidiary of, or is merged into, or consolidated with TransTexas,
          TARC, TCR Holding or TransContinental or one of their Subsidiaries, as
          the case may be, shall be deemed to have been Incurred or issued, as
          the case may be, at the time such Person becomes a Subsidiary of, or
          is merged into, or consolidated with TransTexas, TARC, TCR Holding or
          TransContinental, respectively, or one of their respective
          Subsidiaries.


                                      -34-

<PAGE>   35
    Section 1.07. Section 4.12 of the Original Indenture. Section 4.12 of
the Original Indenture is hereby amended to read in its entirety as follows:

                  Section 4.12. Limitations on Restricting Subsidiary Dividends.
          The Company shall not, and shall not permit any of its Subsidiaries
          (other than TARC, TCR Holding, TransTexas or any of the TTXD Entities)
          to, directly or indirectly, create, assume, or suffer to exist any
          consensual encumbrance or restriction on the ability of any Subsidiary
          of the Company (other than TARC, TCR Holding, TransTexas or any of the
          TTXD Entities) to pay dividends or make other distributions on the
          Capital Stock of any Subsidiary of the Company, except encumbrances
          and restrictions existing under this Indenture and any agreement of a
          Person acquired by the Company or a Subsidiary of the Company, which
          restrictions existed at the time of acquisition, were not put in place
          in anticipation of such acquisition and are not applicable to any
          Person or property, other than the Person or any property of the
          Person so acquired. Notwithstanding anything contained herein to the
          contrary, neither TARC, TCR Holding nor TransTexas may create an
          encumbrance or restriction on their ability to pay premium, if any,
          principal of, or interest on, the Intercompany Loans.

    Section 1.08. Section 4.13 of the Original Indenture. Section 4.13 of
the Original Indenture is hereby amended to read in its entirety as follows:

                  Section 4.13 Limitation on Liens. The Company shall not, and
          shall not permit any of its Subsidiaries to, directly or indirectly,
          Incur, or suffer to exist any Lien upon any of its respective property
          or assets, whether now owned or hereafter acquired which property or
          assets constitute Collateral, other than (a) in the case of the
          Company, Permitted TEC Liens, (b) in the case of any of the TARC
          Entities, Permitted TARC Liens, and (c) in the case of TransTexas,
          Permitted TransTexas Liens. Notwithstanding anything in this Indenture
          to the contrary, (i) TARC shall not, directly or indirectly, incur or
          suffer to exist any Lien on the Capital Stock of TCR Holding owned by
          it (other than to secure the TARC Intercompany Loan), (ii) TCR Holding
          may incur a Lien on Capital Stock of TransContinental to secure the
          TARC Working Capital Loan and (iii) TransContinental shall not be
          bound by this Section 4.13. For the purpose of determining compliance
          with this Section 4.13, if a Lien meets the criteria of more than one
          of the types of Permitted Liens, the Company or the Subsidiary in
          question shall have the right to determine in its sole discretion the
          category of Permitted Lien to which such Lien applies, shall not be
          required to include such Lien in more than one of such categories, and
          may elect to apportion such Lien between or among any two or more
          categories otherwise applicable.

    Section 1.09. Section 4.14 of the Original Indenture.

    (a)   Section 4.14(a) of the Original Indenture is hereby amended to read in
    its entirety as follows:
    
                  (a) The Company shall not, and shall not permit any of its
          Subsidiaries to, consummate an Asset Sale unless (A) an amount equal
          to the Net Cash Proceeds therefrom is (i) in the case of an Asset Sale
          by the Company, applied as described under Section 4.21, (ii) in the
          case of an Asset Sale by one of the TransTexas Entities, applied to an
          Intercompany Loan Redemption of the TransTexas Intercompany Loan,
          (iii) in the case of an Asset Sale by one of the TARC Entities,
          applied to an Intercompany Loan Redemption of the TARC Intercompany
          Loan, (iv) used to make cash payments in the ordinary course of
          business and consistent with past practices that are not otherwise
          prohibited by this

                                      -35-

<PAGE>   36
          Indenture, provided that the aggregate amount so used pursuant to this
          clause (iv) from and after the Issue Date does not exceed $25,000,000
          with respect to TransTexas, or $15,000,000 with respect to the TARC
          Entities (without duplication of amounts used to acquire any Capital
          Assets in accordance with clauses (v), (vi) and (vii) of this
          paragraph (a) below), (v) with respect to an Asset Sale by TransTexas
          or any of its Subsidiaries (x) to the extent such Asset Sale occurs
          prior to the payment in full of the TransTexas Intercompany Loan (and
          any other loans from the Company pursuant to clauses (xvii) or (xxvii)
          of the definition of "Permitted Investment") and includes proved
          reserve assets, used for Capital Expenditures in a Related TransTexas
          Business within 180 days after the date of such Asset Sale, provided
          that TransTexas' most recent Reserve Report indicates that TransTexas
          and its Subsidiaries, after giving effect to the Asset Sale and to the
          addition of proved reserves associated with any assets acquired in
          connection with such Asset Sale, have proved reserves as indicated on
          the most recent Reserve Report at least equal to (1) if such sale
          occurs during the fiscal year ending January 31, 1998, 450 Bcfe of
          natural gas, (2) if such sale occurs during the fiscal year ending
          January 31, 1999, 500 Bcfe of natural gas or with an SEC PV 10 of at
          least $600,000,000 and (3) if such sale occurs during the fiscal year
          ending January 31, 2000 or thereafter, 600 Bcfe of natural gas or with
          an SEC PV 10 of at least $700,000,000, or (y) to the extent such Asset
          Sale occurs substantially contemporaneously with or after the payment
          in full of the TransTexas Intercompany Loan (and any other loan to
          TransTexas from the Company pursuant to clauses (xvii) or (xxviii) of
          the definition of "Permitted Investment") or involves assets that do
          not include proved reserves, used for Capital Expenditures in a
          Related TransTexas Business within 180 days after the date of such
          Asset Sale; (vi) with respect to an Asset Sale by TARC or any of its
          Subsidiaries after the Phase II Completion Date, used for Capital
          Expenditures in a Related TARC Business within 180 days after the date
          of such asset sale; provided that, prior to the payment in full of the
          TARC Intercompany Loan (and any other loan to TARC from the Company
          pursuant to clauses (xvii) or (xxviii) of the definition of "Permitted
          Investment"), the aggregate amount does not exceed $10,000,000, (vii)
          with respect to an Asset Sale by TransTexas or TARC or any of their
          Subsidiaries resulting from (x) the damage to or destruction of assets
          for which insurance proceeds are paid or (y) condemnation, eminent
          domain or similar type proceedings, in each case, used for Capital
          Expenditures in a Related TransTexas Business (in the case of Asset
          Sales by any of the TransTexas Entities) or a Related TARC Business
          (in the case of Asset Sales by any of the TARC Entities) within 360
          days after the date of such Asset Sale or (viii) with respect to an
          Asset Sale by TCR Holding or any of its Subsidiaries, used to purchase
          Notes; and (B) in the case of any Asset Sale or series of related
          Asset Sales for total proceeds in excess of $5,000,000, at least 85%
          of the value of the consideration for such Asset Sale consists of: (i)
          cash, Cash Equivalents, Notes or Exchange Assets or any combination
          thereof if such Asset Sale is by TARC or TCR Holding or any of their
          respective Subsidiaries or (ii) cash, Cash Equivalents or Exchange
          Assets or any combination thereof if such Asset Sale is by TransTexas
          or any of its Subsidiaries.

     (b) Section 4.14(b) of the Original Indenture is hereby amended to read in
     its entirety as follows:

                  (b) Notwithstanding the foregoing limitations on Asset Sales
          and restrictions on the use of Net Cash Proceeds therefrom:

                                      -36-

<PAGE>   37
                     (i) TransTexas or any Subsidiary of TransTexas may convey,
                  sell, lease, transfer, or otherwise dispose of any or all of
                  its assets (upon voluntary liquidation or otherwise) to
                  TransTexas or a wholly owned Subsidiary of TransTexas;

                     (ii) TARC or any Subsidiary of TARC may convey, sell,
                  lease, transfer, or otherwise dispose of any or all of its
                  assets (upon voluntary liquidation or otherwise) to TARC or
                  any wholly owned Subsidiary of TARC;

                     (iii) the Company and its Subsidiaries may engage in Asset
                  Sales in the ordinary course of business;

                     (iv) the Company and its Subsidiaries may engage in Asset
                  Sales not otherwise permitted in clauses (i) through (iii) or
                  (v) through (xiii) of this sentence provided that the
                  aggregate proceeds from all such Asset Sales do not exceed
                  $5,000,000 in any twelve-month period;

                     (v) the Company and its Subsidiaries may engage in Asset
                  Sales pursuant to and in accordance with the provisions of
                  Article V;

                     (vi) the Company and its Subsidiaries may sell, assign,
                  lease, license, transfer, abandon or otherwise dispose of (a)
                  damaged, worn out, unserviceable or other obsolete property in
                  the ordinary course of business or (b) other property no
                  longer necessary for the proper conduct of their business;

                     (vii) TARC and its Subsidiaries may sell accounts
                  receivable to an Accounts Receivable Subsidiary in accordance
                  with the provisions described under Section 4.20;

                     (viii) TARC and its Subsidiaries may convey, sell, transfer
                  or otherwise dispose of crude oil and refined products in the
                  ordinary course of business;

                     (ix) the Company and its Subsidiaries may engage in Asset
                  Sales (a) the Net Cash Proceeds of which are used for payment
                  or prepayment of cash interest or dividend expense on the TCR
                  Holding Participating Preferred Stock on the Notes or the
                  Intercompany Loans up to an amount equal to the two next
                  ensuing interest payments payable under the relevant
                  obligation (less any amount previously prepaid for such
                  interest payments pursuant to this clause (ix)(a)), which
                  payment or prepayment must be made within 180 days of the
                  first regular interest payment date under the relevant
                  obligation following the consummation of the Asset Sale;
                  provided, that any Net Cash Proceeds not used or otherwise
                  designated within 60 days for a purpose or purposes permitted
                  by this Section 4.14 shall be deposited in a segregated
                  account designated for the purposes of paying or prepaying
                  principal of or interest on the Notes or Intercompany Loans or
                  dividend expense on the TCR Holding Participating Preferred
                  Stock, as applicable, (b) in connection with the settlement of
                  litigation or the payment of judgments or (c) the Net Cash
                  Proceeds of which are used in connection with the settlement
                  of litigation or for the payment of judgments; provided, that
                  the aggregate value of assets transferred pursuant to clauses
                  (b) and (c) above from and after the Issue Date does not
                  exceed $25,000,000;


                                      -37-

<PAGE>   38

                     (x) TransTexas may sell, convey, contribute or otherwise
                  transfer the assets comprising the Related TTXD Business to
                  TTXD;

                     (xi) TARC may transfer the Port Facility Assets in
                  connection with the Port Commission Bond Financing;

                     (xii) TransTexas and its Subsidiaries may convey, sell,
                  transfer or otherwise dispose of Hydrocarbons or other mineral
                  products in the ordinary course of business;

                     (xiii) Prior to the TTXD Spin-off, TransTexas may sell,
                  transfer, contribute or otherwise dispose of the capital stock
                  of TTXD or the assets comprising the drilling and energy
                  services business and pipeline services business of TransTexas
                  provided that (a) in the case of a transfer, contribution or
                  other distribution to a company which has a class of equity
                  securities publicly traded on a national securities exchange
                  or on the NNM, (x) at least 50% of the value of the
                  consideration for such Asset Sale consists of cash and up to
                  50% of the value of the consideration for such Asset Sale may
                  consist of Capital Stock and (y) the Net Cash Proceeds from
                  such Asset Sale are applied pursuant to clause (a)(ii) of the
                  prior paragraph or (b) in the case of a transfer, contribution
                  or other distribution to a joint venture, partnership, limited
                  liability company or similar entity newly formed for the
                  purpose of this transfer, up to 100% of the value of the
                  consideration for such Asset Sale may consist of Capital Stock
                  or other equity interests in such entity; provided, that any
                  Net Cash Proceeds from such Asset Sale are applied pursuant to
                  clause (a)(ii) of the prior paragraph;

                     (xiv) The Company and TARC may sell shares of TransTexas
                  Common Stock in connection with a transaction contemplated by
                  the TransTexas Disbursement Agreement and clause (xii) of the
                  definition of "Restricted Payments;"

                     (xv) The Company may transfer all or any portion of its
                  voting rights with respect to Capital Stock of TransTexas
                  pursuant to the Bridge Financing Transaction;

                     (xvi) TARC may transfer the Refinery Assets to TCR Holding
                  and TCR Holding may transfer the Refinery Assets to
                  TransContinental;

                     (xvii) TARC may sell or otherwise transfer Capital Stock of
                  TCR Holding pursuant to the Transaction;

                     (xviii) TARC may sell or otherwise transfer Capital Stock
                  of TCR Holding in connection with a financing consummated to
                  provide funds to TransContinental, provided that TARC complies
                  with Section 4.9;

                                      -38-

<PAGE>   39
                     (xix) TARC may sell or otherwise transfer Capital Stock of
                  TCR Holding owned by it pursuant to the TCR Holding
                  Participating Preferred Stock Redemption; and

                     (xx) Unless otherwise required by the foregoing clauses (i)
                  through (xviii), the proceeds of any Asset Sale permitted
                  thereby shall be used by the Company or its Subsidiaries for
                  purposes not otherwise prohibited by this Indenture.

     (c) Section 4.14(c) of the Original Indenture is hereby amended to read in
     its entirety as follows:

                  (c) The Company shall not, and shall not permit any of its
          Subsidiaries to, consummate a Non-Collateral Asset Sale unless an
          amount equal to the Net Cash Proceeds therefrom is used (i) to
          purchase Notes within ninety (90) days after the date of such Non-
          Collateral Sale in the case of Non-Collateral Asset Sales by any of
          the TARC Entities or (ii) for Capital Expenditures in (A) a Related
          TARC Business in the case of Non-Collateral Asset Sales by any of the
          TARC Entities or (B) a Related TransTexas Business in the case of
          Non-Collateral Asset Sales by any of the TransTexas Entities, in each
          case within 180 days after the date of such Non-Collateral Asset Sale.

     (d) New subsections Section 4.14(d) and (e) are hereby added to the
     Original Indenture to follow subsection 4.14(c) to read in their entirety
     as follows:

                  (d) For the purpose of determining compliance with this
          Section 4.14 with respect to the application or use of the Net Cash
          Proceeds of any Asset Sale consummated by the Company, any TARC
          Entity, any TCR Holding Entity, any TransTexas Entity or any other
          Subsidiary of the Company, if such Net Cash Proceeds would be eligible
          for application or use under or pursuant to more than one of the
          categories of application or use permitted under Section 4.14(a) or
          Section 4.14(b), without, for purposes of determining such eligibility
          only, giving effect to any specific limitation on the amount or the
          aggregate amount of Net Cash Proceeds that may be applied or used
          under any otherwise eligible category of application or use in effect
          at the time such application is to be effected, the Person in question
          consummating such Asset Sale shall have the right to determine in its
          sole discretion the eligible category or categories of application or
          use pursuant to which all or any portion of such Net Cash Proceeds
          shall be applied or used, and may, at its option and in its sole
          discretion, elect either (i) to effect the application or use of the
          full amount of such Net Cash Proceeds pursuant to any one of such
          eligible categories of application or use permitted under Section
          4.14(a) or Section 4.14(b), subject, however, to any limitation on the
          amount or the aggregate amount that may be applied or used under such
          eligible category of application or use in effect at the time such
          application or use is effected, or (ii) to effect the application or
          use of such Net Cash Proceeds by apportioning the full amount of such
          Net Cash Proceeds to be applied or used between or among any two or
          more of such eligible categories of application or use permitted under
          Section 4.14(a) or Section 4.14(b) in such amounts and order of
          application or use as the Person in question consummating such Asset
          Sale may determine in its sole discretion, subject, however, as to
          each portion of such Net Cash Proceeds apportioned for application or
          use under any one of such eligible categories of application or use,
          to any limitation on the amount or the


                                      -39-

<PAGE>   40
          aggregate amount of Net Cash Proceeds that may be applied or used
          under such eligible category of application or use in effect at the
          time such application or use is effected.

                  (e) Notwithstanding anything in this Indenture to the
          contrary, TARC shall not, directly or indirectly, convey, sell,
          transfer or otherwise dispose of any of the Capital Stock of TCR
          Holding owned by it except (i) pursuant to the Transaction, (ii)
          pursuant to a sale of a majority of the Capital Stock of TCR Holding
          or (iii) as permitted by Section 4.14(b)(xvii).

    Section 1.10. Section 4.16 of the Original Indenture. The first paragraph of
Section 4.16 of the Original Indenture is hereby amended to read in its entirety
as follows:

                  Section 4.16 Guarantee by Subsidiaries. If, other than
          pursuant to the Transaction, TARC or TransTexas or any of their
          respective Subsidiaries shall make Investments in an aggregate amount,
          or otherwise transfer (including by capital contribution) or cause to
          be transferred, in a manner otherwise permitted pursuant to this
          Indenture, any assets (tangible or intangible), businesses, divisions,
          real property, or equipment having a book value as shown in the
          Company's most recent consolidated balance sheet or the notes thereto
          (or if greater, a fair market value at the time of transfer) in excess
          of $1,000,000 in or to any Subsidiary of the Company (other than TARC)
          that is not a Guarantor or an obligor on either the TransTexas
          Intercompany Loan or the TARC Intercompany Loan, other than TTXD or
          any Subsidiary of TTXD after the TTXD Spin-off, the Company shall (a)
          cause such transferee Subsidiary to (x) guarantee payment of the
          TransTexas Intercompany Loan, in the case of Subsidiaries of
          TransTexas, or the TARC Intercompany Loan in the case of Subsidiaries
          of TARC, by executing a Guarantee and (y) execute the appropriate
          security document, in substantially the form of the relevant Security
          Document attached hereto, necessary to grant a security interest in
          all of the assets of such Subsidiary (other than Equipment, Inventory
          and Receivables) to secure such Guarantee and (b) deliver to the
          Trustee an Opinion of Counsel, in form reasonably satisfactory to the
          Trustee, that such Guarantee is a valid, binding and enforceable
          obligation of such Subsidiary, subject to customary exceptions for
          bankruptcy, fraudulent transfer and equitable principles. If TARC or
          TransTexas or any of their Subsidiaries shall subsequently sell or
          otherwise transfer all of the Capital Stock of such Subsidiary held by
          TARC, TransTexas or any of their Subsidiaries, the Guarantee required
          hereby shall be withdrawn or cancelled. In addition, if the TTXD
          Spin-off has occurred the Guarantee by TTXD or any of its Subsidiaries
          shall be withdrawn or cancelled.

    Section 1.11. Section 4.18 of the Original Indenture. Section 4.18 of the 
Original Indenture is hereby amended to read in its entirety as follows:

                  Section 4.18 Limitations on Line of Business. The TransTexas
          Entities shall not directly or indirectly engage to any substantial
          extent in any line or lines of business activity other than a Related
          TransTexas Business or such other business activities as are
          reasonably related or incidental thereto. The Company shall not permit
          TransContinental directly or indirectly to engage to any substantial
          extent in any line or lines of business activity other than a Related
          TARC Business or such other business activities as are reasonably
          related or incidental thereto. Neither the Company nor any Affiliate
          of John R.

                                      -40-

<PAGE>   41




          Stanley (other than Persons who are Affiliates solely by being
          directors or Affiliates of directors of one or more companies
          affiliated with John R. Stanley and other than TARC, TCR Holding,
          TransContinental, TransTexas, TTXD or any of their Subsidiaries) may
          engage to any substantial extent in any line or lines of business
          activity that is a Related TransTexas Business. The Company shall not
          have any direct Subsidiaries other than TARC, TTXD, TransTexas, an
          Accounts Receivable Subsidiary, and any wholly owned Subsidiary formed
          solely for the purpose of facilitating the reincorporation of TARC in
          Delaware or the repurchase of the TARC Warrants.

    Section 1.12. Section 4.21 of the Original Indenture. The first paragraph of
Section 4.21 of the Original Indenture is hereby amended to read in its entirety
as follows:

                  Not later than (x) 20 Business Days after any date on which
          the Accumulated Amount (as defined below) exceeds $5,000,000, or (y)
          if there is included in the Accumulated Amount any payments in respect
          of an Intercompany Loan Redemption of the TransTexas Intercompany
          Loan, then not later than 91 days after any date on which the
          Accumulated Amount exceeds $5,000,000 after deducting any portion
          thereof applied by the Company to purchase (and surrender to the
          Trustee for cancellation) Notes pursuant to an Open Market Purchase
          during the period ending the day prior to the end of such 91 day
          period, the Company shall make an irrevocable, unconditional offer (an
          "Excess Cash Offer") to the Holders to purchase the maximum amount of
          Notes which could be acquired by application of the Accumulated Amount
          as defined below (the "Excess Cash Offer Amount"), at a purchase price
          (the "Excess Cash Offer Price") equal to 100% of the Accreted Value of
          the Senior Secured Discount Notes and the principal amount of the
          Senior Secured Notes plus accrued and unpaid interest, if any, to and
          including, the date the Notes tendered are purchased and paid for in
          accordance with this Indenture, which date shall be no later than 25
          Business Days after the first date on which the Excess Cash Offer is
          required to be made (the "Excess Cash Purchase Date"). The Excess Cash
          Offer Amount required to be paid hereunder shall be reduced by the
          amount needed to pay the cash interest on the Notes through maturity
          (less any interest payable to the Company on the TARC Intercompany
          Loan, and the TransTexas Intercompany Loan and any other intercompany
          loan payable to the Company) after giving effect to the Notes
          repurchased pursuant to the Excess Cash Offer (the "Interest Reserve
          Amount"). The Company shall send notice of an Excess Cash Offer at
          least 20 Business Days prior to the close of business on the third
          Business Day prior to the Excess Cash Purchase Date (the "Final Put
          Date"), by first-class mail, to each Holder at his address set forth
          upon the registry of the Company, with a copy to the Trustee. The
          notice to the Holders will contain all information, instructions, and
          materials required by applicable law or otherwise material to such
          Holders' decision to tender Notes pursuant to the Excess Cash Offer.
          An amount equal to the aggregate of all Excess Cash received by the
          Company, less the aggregate amount thereof theretofore applied to
          purchase Notes pursuant hereto is referred to as the "Accumulated
          Amount." "Open Market Purchase" means any repurchase of Notes with any
          prepayment of the TransTexas Intercompany Loan which repurchases
          consist of Senior Secured Notes at a repurchase price (excluding
          interest) no greater than par, or Senior Secured Discount Notes at a
          repurchase price (excluding interest, if any) no greater than the
          accreted value thereof; provided, however, that Senior Secured
          Discount Notes may not be repurchased unless cash or Cash Equivalents
          in an amount needed to pay the cash


                                      -41-

<PAGE>   42
          interest on the Notes through June 15, 1999 is first set aside and
          reserved solely for such interest payments. For purposes hereof,
          amounts applied to purchase Notes pursuant to an Open Market Purchase
          shall be deemed to be the earliest received prepayments of the
          TransTexas Intercompany Loan which have not theretofore been applied
          to purchase Notes pursuant to an Open Market Purchase. Prior to making
          any Excess Cash Offer, the Company shall invest the Accumulated Amount
          only in cash and Cash Equivalents. The Company may, at its option,
          elect to make an Excess Cash Offer in the manner specified herein
          prior to the time that the Accumulated Amount exceeds $5,000,000.

    Section 1.13. Section 4.24 of the Original Indenture. Section 4.24 of the 
Original Indenture is hereby amended to read in its entirety as follows:

                  Section 4.24 Additional Interest Excess Cash Offer. Upon the
          occurrence of a TransTexas Interest Increase, the Company shall be
          obligated to make an offer to purchase the Notes upon the terms and
          subject to the conditions described below. Not later than 20 Business
          Days after any date on which the Additional Interest Accumulated
          Amount (as defined below) exceeds $10,000,000, the Company shall make
          an irrevocable, unconditional offer (an "Additional Interest Excess
          Cash Offer") to the Holders to purchase the maximum amount of Notes
          which could be acquired by application of the Additional Interest
          Accumulated Amount (as defined below) (the "Additional Interest Excess
          Cash Offer Amount"), at a purchase price (the "Additional Interest
          Excess Cash Offer Price") equal to 101% of the Accreted Value of the
          Senior Secured Discount Notes and the principal amount of the Senior
          Secured Notes, in each case, plus accrued and unpaid interest, if any,
          to and including the date the Notes tendered are purchased and paid
          for in accordance with the Indenture, which date shall be no later
          than 25 Business Days after the first date on which the Additional
          Interest Excess Cash Offer is required to be made (the "Additional
          Interest Excess Cash Purchase Date"). The Company shall send notice of
          an Additional Interest Excess Cash Offer at least 20 Business Days
          prior to the close of business on the third Business Day prior to the
          Additional Interest Excess Cash Purchase Date (the "Additional
          Interest Final Put Date"), by first-class mail, to each Holder at his
          address set forth upon the registry of the Company, with a copy to the
          Trustee. The notice to the Holders will contain all information,
          instructions, and materials required by applicable law or otherwise
          material to such Holders' decision to tender Notes pursuant to the
          Additional Interest Excess Cash Offer. An amount equal to the
          aggregate of all Additional Interest Excess Cash received by the
          Company is referred to as the "Additional Interest Accumulated
          Amount." Prior to making any Additional Interest Excess Cash Offer,
          the Company shall invest the Additional Interest Accumulated Amount
          only in cash and Cash Equivalents. The Company may, at its option,
          elect to make an Additional Interest Excess Cash Offer in the manner
          specified herein prior to the time that the Additional Interest
          Accumulated Amount exceeds $10,000,000.

                  To the extent applicable and if required by law, the Company
          shall comply with Section 14 of the Exchange Act and the provisions of
          Regulation l4E and any other tender offer rules under the Exchange Act
          and other securities laws, rules, and regulations which may then be
          applicable to any Additional Interest Excess Cash Offer by the Company
          to purchase the Notes. The Company shall give the Trustee prompt
          notice if the Additional Interest Accumulated Amount exceeds
          $10,000,000.

                                      -42-

<PAGE>   43
                  On or before an Additional Interest Excess Cash Purchase Date,
          the Company shall (a) accept for payment Notes or portions thereof
          properly tendered pursuant to the Additional Interest Excess Cash
          Offer prior to the close of business on the Additional Interest Final
          Put Date (on a pro rata basis between the issues (to the maximum
          extent possible) based on the Value of the Notes actually tendered if
          Notes with a Value in excess of the Value of Notes to be acquired are
          tendered and not withdrawn), (b) deposit with the Paying Agent U.S.
          Legal Tender sufficient to pay the Additional Interest Excess Cash
          Offer Price through the Additional Interest Excess Cash Purchase Date
          of all Notes or portions thereof so accepted, and (c) deliver to the
          Trustee Notes so accepted together with an Officers' Certificate
          stating the Notes or portions thereof being purchased by the Company.
          The Paying Agent shall promptly mail or deliver to Holders of Notes so
          accepted, payment in an amount equal to the Additional Interest Excess
          Cash Offer Price through the Additional Interest Excess Cash Purchase
          Date for such Notes. The Trustee shall promptly cancel all Notes
          accepted by the Company pursuant to the Additional Interest Excess
          Cash Offer and authenticate and mail or deliver to the Holders of
          Notes so accepted a new Note equal in Value to any unpurchased portion
          of the Note surrendered. Any Notes not so accepted shall be promptly
          mailed or delivered by the Company to the Holder thereof. The Company
          shall publicly announce the results of the Additional Interest Excess
          Cash Offer on or as soon as practicable after the Additional Interest
          Excess Cash Payment Date.

                  If the amount required to acquire all Notes tendered by
          Holders pursuant to the Additional Interest Excess Cash Offer (the
          "Additional Interest Excess Cash Acceptance Amount") shall be less
          than the aggregate Additional Interest Excess Cash Offer Amount, the
          excess of the Additional Interest Excess Cash Acceptance Amount shall
          be (i) invested in cash or Cash Equivalents, (ii) used by the Company
          to make a Note Repurchase or (iii) used by the Company to make loans
          to its Subsidiaries, provided that such loans (x) are on terms no less
          favorable to the Company than the economic terms described to the
          Holders in the Additional Interest Excess Cash Offer, (y) are made to
          the parties described in the Excess Cash Offer and (z) have a maturity
          date which is not after the maturity date of the Notes. Upon
          consummation of any Additional Interest Excess Cash Offer made in
          accordance with the terms of the Indenture, the Additional Interest
          Accumulated Amount will be reduced to zero.

                  Notwithstanding anything contained in the foregoing to the
          contrary, the Company shall immediately deposit any cash received by
          it that the Company has allocated to the Additional Interest Reserve
          Amount into a segregated cash collateral account in which the Trustee
          has a perfected first priority security interest pending such uses.

    Section 1.14. Sections 4.25 and 4.26 of the Original Indenture. New
Sections 4.25 and 4.26 are hereby added to follow Section 4.24 of the Original
Indenture to read in their entirety as follows:

                  Section 4.25 Monthly Status Reports. The Company shall cause
          TransContinental to, (A) not later than the 20th day of each month
          (or, if such day is not a Business Day, then the first Business Day
          following such day), commencing in December 1998 and continuing
          through the Phase II Completion Date, issue a press release (and, if
          applicable, file a copy thereof with the SEC pursuant to a Form 8-K
          Current Report) disclosing the status of completion of the Capital
          Improvement Program through the end of the

                                      -43-

<PAGE>   44
          immediately preceding month and (B) conduct a monthly telephone
          conference call relating thereto with the chief executive officer of
          TARC or his designee in which Holders will be entitled to participate
          and provide notice of the time and place of such call at least 48
          hours in advance thereof.

                  Section 4.26 Limitation on Issuances of Equity Securities by
          TCR Holding or TransContinental. The Company shall not permit TCR
          Holding, TransContinental or any Subsidiary of either of them to issue
          (other than pursuant to the Transaction, including securities issued
          upon conversion of or in exchange for securities issued pursuant to
          the Transaction upon the terms established in connection with the
          Transaction, or issuances to TransContinental or any of its
          Subsidiaries) any Capital Stock or other equity securities (other than
          Disqualified Capital Stock that is not convertible into or
          exchangeable for Qualified Capital Stock and other equity securities
          that are not accounted for as equity securities in accordance with
          GAAP) unless the issuer first obtains a favorable written opinion as
          to the fairness of such transaction to the issuer, from a financial
          point of view, from an independent nationally recognized accounting or
          investment banking firm.


    Section 1.15. Section 5.1 of the Original Indenture.

    (a)   Section 5.1(a)(1) of the Original Indenture is hereby amended to read 
    in its entirety as follows:

                  (1) either (a) the Company, TARC or TransTexas, as the case
          may be, shall be the continuing Person, or (b) the Person (if other
          than the Company) formed by such consolidation or into which the
          Company, TARC or TransTexas, as the case may be, is merged or to which
          all or substantially all of the properties and assets of the Company,
          TARC or TransTexas, as the case may be, are transferred as an entirety
          or substantially as an entirety (the Company, TARC or TransTexas, as
          the case may be, or such other Person being hereinafter referred to as
          the "Surviving Person") shall be a corporation or partnership
          organized and validly existing under the laws of the United States,
          any State thereof or the District of Columbia, and shall expressly
          assume, by an indenture supplemental hereto and any supplements to any
          Security Documents as the Trustee in its sole discretion may require,
          executed and delivered to the Trustee on or prior to the consummation
          of such transaction, in form satisfactory to the Trustee, all the
          obligations of the Company, TARC or TransTexas, as the case may be,
          under the Notes, the TARC Intercompany Loan, the TransTexas
          Intercompany Loan, the Security Documents, the Registration Rights
          Agreements, and this Indenture; provided, however, that TCR Holding
          shall not be required to assume TARC's obligations under the Security
          Documents in connection with the transfer to TCR Holding by TARC of
          the Refinery Assets as part of the Transaction, provided TCR Holding,
          concurrently with such transfer, executes and delivers to the Company
          the TCR Holding Pledge Agreement and assumes all of the obligations of
          TARC pursuant to the TARC Intercompany Loan and the Company assigns
          its rights thereunder to the Trustee;


                                      -44-

<PAGE>   45
     (b) Section 5.1 of the Original Indenture is hereby amended to add
     subsection (e) to read in its entirety as follows:

                  (e) Notwithstanding anything contained in this Article V to
          the contrary, (i) the provisions of clause (a) shall not apply to the
          transfer to TCR Holding by TARC of the Refinery Assets as part of the
          Transaction, (ii) the provisions of clause (a) shall not apply to the
          transfer to TransContinental by TCR Holding of the Refinery Assets as
          part of the Transaction and (iii) the provisions of clauses (a)(2),
          (a)(3) and (a)(5) shall not apply to a merger of TARC with or into the
          Company.

     Section 1.16. Section 5.2 of the Original Indenture. Section 5.2 of the
Original Indenture is hereby amended to read in its entirety as follows:

                  Section 5.2 Successor Corporation Substituted. Upon any
          consolidation or merger, or any transfer of assets in accordance with
          Section 5.1 (other than the transfers of the Refinery Assets by TARC
          to TCR Holding and by TCR Holding to TransContinental pursuant to the
          Transaction), the Surviving Person formed by such consolidation or
          into which the Company, TARC or TransTexas, as the case may be, is
          merged or to which such transfer is made shall succeed to, and be
          substituted for, and may exercise every right and power of, the
          Company, TARC or TransTexas, as the case may be, under this Indenture
          with the same effect as if such Surviving Person had been named as the
          Company, TARC or TransTexas, as the case may be, herein. When a
          Surviving Person duly assumes all of the obligations of the Company
          pursuant hereto and pursuant to the Notes, the predecessor shall be
          released from such obligations. Upon the assumption by TCR Holding of
          all of the obligations of TARC under the TARC Intercompany Loan, TARC
          shall be released from any further obligation with respect to the TARC
          Intercompany Loan.

     Section 1.17.  Section 6.1 of the Original Indenture.

     (a) Section 6.1(b) of the Original Indenture is hereby amended to read in
     its entirety as follows:

                  (b) default in the payment of all or any part of the principal
          of (or premium, if any, applicable to), the Notes when and as the same
          becomes due and payable at maturity, redemption, by acceleration, or
          otherwise, including default in the payment of the Change of Control
          Purchase Price in accordance with Article XI, or the Excess Cash Offer
          Price in accordance with Section 4.21;

     (b) Section 6.1(d) of the Original Indenture is hereby amended to read in
     its entirety as follows:

                  (d) a default which extends beyond any stated period of grace
          applicable thereto, including any extension thereof, under any
          mortgage, indenture or instrument under which there is outstanding any
          Debt of the Company, any of its Subsidiaries or TransContinental with
          an aggregate principal amount in excess of $25,000,000 if by reason of
          such default the principal of such Debt and all accrued and unpaid
          interest thereon has been declared due and payable, or failure to pay
          such Debt at its stated maturity, provided that a waiver by all of the
          lenders of such debt of such default shall constitute a waiver
          hereunder for the same period;

     (c) Section 6.1(h) of the Original Indenture is hereby amended to read in
     its entirety as follows:


                                      -45-

<PAGE>   46

                  (h) except as caused by the consummation of the Transaction
          (including, without limitation, the release of the liens on the
          Refinery Assets granted pursuant to the TARC Security Documents), any
          of the Security Documents shall for any reason cease to be in full
          force and effect other than pursuant to the terms thereof (except
          where no material adverse effect to the Holders would result), or
          shall cease to give the Trustee for the ratable benefit of the Holders
          the Liens, rights, powers and privileges purported to be created
          thereby including but not limited to, a perfected security interest
          in, and Lien on, the Collateral in accordance with the terms thereof,
          except where the failure to have such Lien, rights, powers and
          privileges shall not have a material adverse effect on the Holders;

     (b) Section 6.1(i) of the Original Indenture is hereby amended to read in
     its entirety as follows:

                  (i) Intentionally Omitted;

     Section 1.18. Section 9.1 of the Original Indenture. Section 9.1 of the
Original Indenture is hereby amended to read in its entirety as follows:

                  Section 9.1 Supplemental Indentures Without Consent of
          Holders. Without the consent of any Holder, the Company, when
          authorized by Board Resolutions, and the Trustee, at any time and from
          time to time, may enter into one or more indentures supplemental
          hereto or a restatement hereof or amendments to or restatements of the
          Security Documents, the Intercompany Loans and documents related
          thereto, the Intercreditor Agreements, the TransTexas Disbursement
          Agreement or the Disbursement Agreement (collectively, the "Other
          Documents"), in form satisfactory to the Trustee, for any of the
          following purposes:

                     (a) to cure any ambiguity, defect, or inconsistency, or to
                  make any other provisions with respect to matters or questions
                  arising under this Indenture, the Security Documents, the
                  Intercreditor Agreement or the Disbursement Agreement which
                  shall not be inconsistent with the provisions of this
                  Indenture, provided such action pursuant to this clause (a)
                  shall not adversely affect the interests of any Holder in any
                  respect;

                     (b) to add to the covenants of the Company for the benefit
                  of the Holders or to surrender any right or power herein
                  conferred upon the Company or to make any other change that
                  does not adversely affect the rights of any Holder, provided
                  that the Company has delivered to the Trustee an Opinion of
                  Counsel stating that such change does not adversely affect the
                  rights of any Holder;

                     (c) to provide for additional collateral for the Notes;

                     (d) to evidence the succession of another Person to the
                  Company and the assumption by any such successor of the
                  obligations of the Company herein and in the Notes in
                  accordance with Article V;

                     (e) to comply with the TIA; or


                                      -46-

<PAGE>   47
                     (f) to restate this Indenture or any of the Other Documents
                  so that it reflects this Indenture or such Other Document, as
                  the case may be, as originally executed as amended by all
                  amendments and supplements hereto or thereto through the date
                  of such restatement and contains only the then effective
                  provisions of this Indenture or such Other Document, as the
                  case may be.

     Section 1.19. Section 9.6 of the Original Indenture. Section 9.6 of the
Original Indenture is hereby amended to read in its entirety as follows:

                  Section 9.6 Trustee to Sign Amendments, Etc. The Trustee shall
          execute any amendment, supplement, restatement or waiver authorized
          pursuant to this Article IX, provided that the Trustee may, but shall
          not be obligated to, execute any such amendment, supplement,
          restatement or waiver which affects the Trustee's own rights, duties
          or immunities under this Indenture. The Trustee at the expense of the
          Company shall be entitled to receive, and shall be fully protected in
          relying upon, an Opinion of Counsel stating that the execution of any
          amendment, supplement, restatement or waiver authorized pursuant to
          this Article IX is authorized or permitted by this Indenture.

     Section 1.20. Section 12.4 of the Original Indenture. Section 12.4(a) of
the Original Indenture is hereby amended to read in its entirety as follows:

                  Section 12.4 Disposition of Certain Collateral Without
          Requesting Release.

                  (a) Notwithstanding the provisions of Sections 12.5, 12.6,
          12.7, 12.8 and 12.14, the Company (or with respect to the Security
          Documents, the grantor of the security interest thereunder) may,
          without requesting or receiving the consent of the Trustee (and any
          lender, trustee or collateral agent under any of the Security
          Documents):

                     (i) sell, assign, transfer, license or otherwise dispose
                  of, free from the Security Interests, any personal property
                  constituting Collateral that has become worn out, obsolete, or
                  unserviceable, upon replacing the same with machinery or
                  equipment constituting Collateral not necessarily of the same
                  character but, at the time of such sale, assignment, transfer,
                  license or other disposition, being of at least equal value
                  and utility as the property so disposed of, which property
                  shall without further action become Collateral subject to the
                  Security Interests;

                     (ii) (A) sell, assign, transfer, license or otherwise
                  dispose of, free from the Security Interests, inventory in the
                  ordinary course of business and consistent with past
                  practices, (B) collect, liquidate, sell, factor or otherwise
                  dispose of, free from the Security Interests, notes receivable
                  in the ordinary course of business and consistent with past
                  practices or (C) make cash payments (including repayments of
                  Debt permitted to be Incurred hereby) that are not otherwise
                  prohibited by this Indenture;

                     (iii) sell, assign, lease, license, transfer, abandon or
                  otherwise dispose of, free from the Security Interests, (a)
                  damaged, worn out or other obsolete property

                                      -47-

<PAGE>   48
                  in the ordinary course of business or (b) other property no
                  longer necessary for the proper conduct of its business; and

                     (iv) dispose of Collateral, free from the Security
                  Interests, pursuant to clause (i), (ii), (iii), (iv), (vii),
                  (viii) or (xii) of Section 4.14(b).

     Section 1.21. Section 12.5 of the Original Indenture. Section 12.5(a) of
the Original Indenture is hereby amended to read in its entirety as follows:

                  (a) Upon receipt of a Release Request, the Trustee shall
          execute and deliver, within five Business Days from the receipt of
          such Release Request, any instruments deemed by the Company (or with
          respect to the Security Documents, the grantor of the security
          interests thereunder) to be reasonably necessary or reasonably
          appropriate to release all or a part of the Collateral from the
          Security Interests, if the provisions of this Section 12.5 have been
          complied with. Any such Release Request shall request the Trustee to
          execute one or more specifically described release instruments (which
          release instruments shall accompany such Release Request) and shall
          certify (i) that no Event of Default has occurred and is continuing
          (or with respect to a Release Request relating to any of the Security
          Documents, that no event of default has occurred and is continuing
          under the applicable Security Document) and (ii) that one of the
          conditions of this Section 12.5(a) set forth below (specifying such
          condition), and if such specified condition is described in clause
          (i), (ii), or (iii) below, that the conditions of Section 12.4, 12.6
          or 12.7, if applicable, have been, or simultaneously with or
          immediately following the release will be, fulfilled:

                  (i) the Collateral will be disposed of in compliance with
          Section 12.4;

                  (ii) there is a substitution of Substitute Collateral in
          accordance with Section 12.6;

                  (iii) there is a deposit of cash in a cash collateral account
          in accordance with Section 12.7;

                  (iv) the Collateral to be released will be used within five
          business days either to make redemptions or purchases of Notes which
          will be delivered to the Trustee for cancellation;

                  (v) the Collateral is to be released in connection with an
          Asset Sale made in compliance with Section 4.14;

                  (vi) all of the conditions precedent to the termination of the
          Security Document under which the Lien in the Collateral to be
          released was created, or to the release of such Collateral from the
          Lien created by such Security Document, as set forth in such Security
          Document, have been satisfied;

                  (vii) Holders of not less than 66 2/3% in Value of the then
          outstanding Notes have consented in writing to such release of
          Collateral from the Security Interests;

                  (viii) the Collateral is to be released in connection with the
          TTXD Spin-off;

                                      -48-

<PAGE>   49
                  (ix) the Collateral is to be released in connection with the
          repurchase by TransTexas of its common stock made pursuant to the
          terms of clause (xii) of the definition of "Restricted Payments"
          contained herein:

                  (x) the Collateral to be released relates to the lien of the
          TARC Mortgage on a portion of Parcel B-1 of TARC's refinery (which
          parcel is more particularly described in Exhibit "A" to the TARC
          Mortgage) for dedication to a governmental authority (such parcel
          being referred to as the "Dedicated Parcel") for the purpose of
          relocating Prospect Avenue from the western boundary line of such
          Parcel B-1 to the eastern and northern boundary lines of such Parcel
          B-1, provided that (i) the fee interest in and to the real property
          currently dedicated for use as Prospect Avenue is conveyed to TARC
          (such parcel being referred to as the "Reconveyed Parcel"), (ii) TARC
          executes and delivers a supplemental mortgage evidencing that the lien
          of the TARC Mortgage encumbers the Reconveyed Parcel, (iii) the
          Company executes and delivers a supplemental collateral assignment
          with respect to such supplemental mortgage and (iv) the Company
          delivers to the Trustee a certificate of the Construction Supervisor
          certifying that the loss of the use of the Dedicated Parcel does not
          have a material adverse affect on the use, operation or maintenance of
          TARC's refinery or the Capital Improvement Program;

                  (xi) the Collateral to be released secures debt or other
          obligations that constitute First Lien Debt and the Company (or with
          respect to releases under the Security Documents, the grantor of the
          security interest thereunder) has satisfied all the requirements for
          obtaining subordination of the Security Interests therein pursuant to
          Section 12.2 and such Collateral is (or will be, upon obtaining such
          release) encumbered by a Lien permitted pursuant to the terms of
          clauses (d), (k), (s) or (t) of the definition of Permitted TARC Lien
          or clauses (f), (l) or (o) of the definition of Permitted TransTexas
          Lien;

                  (xii) the Collateral to be released consists of deposit
          accounts of the Company, the TARC Intercompany Bridge Loan and the
          rights of the Company under the Loan Agreement relating to the TARC
          Intercompany Bridge Loan and the Release Request delivered to the
          Trustee with respect to such release states that concurrently with or
          immediately following the effectiveness of such release the Company
          will issue Bridge Loan Notes;

                  (xiii) the Collateral to be released consists of the TARC
          Collateral and Capital Stock of TCR Holding (other than the
          Participating Preferred Stock of TCR Holding issued to TARC pursuant
          to the Transaction) and TransContinental and the Release Request
          delivered to the Trustee with respect to such release states that
          immediately following the effectiveness of such release TARC will
          issue Debt with a principal amount of at least $150 million and sell
          it to the Purchasers. Concurrently with the effectiveness of such
          release, the Security and Pledge Agreement dated as of June 13, 1997
          by TARC in favor of the Company, as amended, shall terminate and shall
          cease to be of any further force or effect; and

                  (xiv) the Collateral to be released consists of the
          Participating Preferred Stock of TCR Holding issued to TARC pursuant
          to the Transaction, the Release Request delivered to the Trustee with
          respect to such release states that TCR Holding has exercised its
          option

                                      -49-

<PAGE>   50

          to effect the TCR Holding Participating Preferred Stock Redemption and
          is accompanied by a copy of the notice of redemption received from TCR
          Holding with respect thereto and there is pledged to the Trustee
          concurrently with such release the securities of TCR Holding received
          by TARC pursuant to the TCR Holding Participating Preferred Stock
          Redemption.

     Section 1.22. Section 13.15 of the Original Indenture. A new Section 13.15
is hereby added to the Original Indenture to follow Section 13.14, to read in 
its entirety as follows:

                  Section 13.15. Termination of Covenants and Other Provisions
          Relating to TARC and TCR Holding. Upon payment in full of the TARC
          Intercompany Loan, the provisions contained in Articles IV, V, VI and
          XI of this Indenture, to the extent they relate to any of the TARC
          Entities, any of the TCR Holding Entities or TransContinental or the
          Capital Improvement Program, shall cease to be of any further force or
          effect and neither the Company nor any Guarantor shall be bound
          thereby. In addition, upon a merger of TARC with or into the Company,
          the provisions of Article IV, V, VI and XI of this Indenture, to the
          extent they relate to TARC, shall cease to be of any further force and
          effect and, thereafter, neither the Company nor any Guarantor shall be
          bound thereby. In addition, the TCR Holding Pledge Agreement shall
          cease to be of any further force or effect upon payment in full of the
          TARC Intercompany Loan.


                                   ARTICLE II
                               GENERAL PROVISIONS

     Section 2.01. Effectiveness of Amendments. This Supplemental Indenture is 
effective as of the date first above written. However, the provisions of the
Original Indenture amended or eliminated as provided in this Supplemental
Indenture (the "Amended Provisions") shall remain operative in the form in which
they exist in the Original Indenture until the Transaction Closing Date,
whereupon the Amended Provisions will be amended or eliminated as provided
herein, effective immediately prior to the Transaction Closing Date.

     Section 2.02. Ratification of Indenture. The Original Indenture is in all 
respects acknowledged, ratified and confirmed, and shall continue in full force 
and effect in accordance with the terms thereof and as supplemented by this 
Supplemental Indenture. The Original Indenture and this Supplemental Indenture,
shall be read, taken and construed as one and the same instrument.

     Section 2.03. Certificate and Opinion as to Conditions Precedent.
Simultaneously with and as a condition to the execution of this Supplemental 
Indenture, the Company is delivering to the Trustee:

          (a) an Officers' Certificate in the form attached hereto as Exhibit A;
          and

          (b) an Opinion of Counsel covering the matters described in Exhibit B 
          attached hereto.

     Section 2.04. Effect of Headings. The Article and Section headings in this 
Supplemental Indenture are for convenience only and shall not affect the 
construction of this Supplemental Indenture.


                                      -50-

<PAGE>   51
     Section 2.05. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK, AS APPLIED
TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.

     Section 2.06. Counterparts. This Supplemental Indenture may be executed in
any number if counterparts, each of which so executed shall be deemed to be an
original, but all such counterparts shall together constitute the same
instrument.

     IN WITNESS WHEREOF, the parties to this Supplemental Indenture have caused
the Supplemental Indenture to be duly executed, and their respective corporate
seals to be hereunto affixed and attached, on and effective as of day and year
first above written.




                                   TRANSAMERICAN ENERGY CORPORATION



Attest:                            By:
       ----------------------         -----------------------------------------
         Tim Moore,                     Ed Donahue,
         Assistant Secretary            Vice President, Chief Financial Officer
                                        and Secretary


                                   FIRSTAR BANK OF MINNESOTA, N.A.,
                                   as Trustee



                                   By:
                                      -----------------------------------------
                                        Frank P. Leslie, III,
                                        Vice President



                                      -51-


<PAGE>   1
                                                                  EXHIBIT 4.3

- -------------------------------------------------------------------------------


                        TRANSAMERICAN ENERGY CORPORATION

                                       AND

                           TRANSTEXAS GAS CORPORATION


                            ------------------------

                       SECOND AMENDMENT TO LOAN AGREEMENT

                          Dated as of December 15, 1998

                           --------------------------



- -------------------------------------------------------------------------------





<PAGE>   2



                       SECOND AMENDMENT TO LOAN AGREEMENT

         This Second Amendment to Loan Agreement (this "Second Amendment") is
made as of December 15, 1998, by and between TransAmerican Energy Corporation, a
Delaware corporation ("TEC"), and TransTexas Gas Corporation, a Delaware
corporation ("TransTexas").

         WHEREAS, TEC and Firstar Bank of Minnesota, N.A., as Trustee, have
entered into an Indenture dated as of June 13, 1997, as amended (the
"Indenture"), pursuant to which TEC issued $475,000,000 aggregate principal
amount of its 11 1/2% Senior Secured Notes due 2002 and $1,130,000,000 aggregate
principal amount of its 13% Senior Secured Discount Notes due 2002
(collectively, the "Notes"); and

         WHEREAS, TEC and TransTexas have entered into a Loan Agreement dated as
of June 13, 1997, as amended by a First Amendment to Loan Agreement dated as of
December 30, 1997 (as so amended, the "TransTexas Intercompany Loan Agreement"),
pursuant to which TEC agreed to loan to TransTexas an aggregate of $450,000,000
out of the proceeds of the issuance of the Notes; and

         WHEREAS, TEC and TransTexas have agreed to certain amendments to the
TransTexas Intercompany Loan Agreement as hereinafter set forth (the "Proposed
Amendments"); and

         WHEREAS, pursuant to Section 9.2 of the Indenture, the holders of not
less than 66-2/3% in aggregate Value (as defined in the Indenture) of the Notes
have consented to the Proposed Amendments to the TransTexas Intercompany Loan
Agreement;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties to this Second
Amendment hereby agree as follows:


                                    ARTICLE I
            AMENDMENTS TO THE TRANSTEXAS INTERCOMPANY LOAN AGREEMENT

         Section 1.01. Amendments to Section 1.1. The following definitions in
Section 1.1 of the TransTexas Intercompany Loan Agreement are hereby amended as
follows:

         (a)      The definition of "Equipment" is hereby amended to read as 
follows:

                           "Equipment" shall mean and includes all of any
                  Person's now owned or hereafter acquired Vehicles, drilling
                  rigs, workover rigs, fracture stimulation equipment, well site
                  compressors, rolling stock and related equipment and other
                  assets accounted for as equipment by such Person in its
                  financial statements, all proceeds thereof, and all documents
                  of title, books, records, ledger cards, files, correspondence
                  and computer files, tapes, disks and related data processing
                  software that any time evidence or contain information
                  relating to the foregoing; provided, however that "Equipment"
                  shall not include any assets constituting part of a natural
                  gas pipeline or the compression or dehydration equipment used
                  in the operation of any such pipeline; provided further,
                  however, notwithstanding the foregoing, "Equipment" shall
                  include (x) production related facilities, (y) assets
                  comprising amine plants and (z) equipment and related assets
                  designed to dehydrate, compress, treat, separate, stabilize,
                  store or otherwise process hydrocarbons,


<PAGE>   3



                  including, without limitation, the facilities at Winnie, Texas
                  (including the real property associated with such facilities
                  at Winnie, Texas).

         (b) The definition of "Permitted Hedging Transactions" is hereby
amended to read as follows:

                           "Permitted Hedging Transactions" shall mean
                  non-speculative transactions in futures, forwards, swaps or
                  option contracts (including both physical and financial
                  settlement transactions) engaged in by the TransTexas Entities
                  as part of their normal business operations as a
                  risk-management strategy or hedge against adverse changes in
                  market conditions in the prices of natural gas, condensate,
                  feedstock or refined products; provided, that such
                  transactions do not in the case of the Borrower, on a monthly
                  basis, relate to more than 90% of the TransTexas Entities'
                  average net hydrocarbon production per month from the
                  Continuing Operations for the most recent 3-month period
                  measured at the time of such incurrence; provided, further,
                  that, at the time of such transaction (i) the counter party to
                  any such transaction is an Eligible Institution or a Person
                  that has an Investment Grade Rating or has an issue of debt
                  securities or preferred stock outstanding with an Investment
                  Grade Rating or (ii) such counter party's obligation pursuant
                  to such transaction is unconditionally guaranteed in full by,
                  or secured by a letter of credit issued by, an Eligible
                  Institution or a Person that has an Investment Grade Rating or
                  that has an issue of debt securities or preferred stock
                  outstanding with an Investment Grade Rating.

         (c) The definition of "Permitted Investment" is hereby amended to read
as follows:

                           "Permitted Investment" shall mean, when used with
                  reference to the Borrower or its Subsidiaries, (i) trade
                  credit extended to persons in the ordinary course of business;
                  (ii) purchases of Cash Equivalents; (iii) Investments by the
                  Borrower or its wholly owned Subsidiaries in wholly owned
                  Subsidiaries of the Borrower (other than TTXD) that are
                  engaged in Related TransTexas Businesses; (iv) Swap
                  Obligations; (v) the receipt of capital stock in lieu of cash
                  in connection with the settlement of litigation; (vi) advances
                  to officers and employees in connection with the performance
                  of their duties in the ordinary course of business in an
                  amount not to exceed $3 million in the aggregate outstanding
                  at any time; (vii) margin deposits in connection with
                  Permitted Hedging Transactions; (viii) an Investment in one or
                  more Unrestricted Subsidiaries of the Borrower in an aggregate
                  amount, net return of income on such investment, not in excess
                  of $25 million less the amount of any Unrestricted
                  Non-Recourse Debt outstanding of Borrower or any of its
                  Subsidiaries; (ix) Investments and expenditures made in the
                  ordinary course of business by the Borrower or its
                  Subsidiaries, and of a nature that is or shall have become
                  customary in, the oil and gas business as a means of actively
                  exploiting, exploring for, acquiring, developing, processing,
                  gathering, marketing or transporting oil and gas or providing
                  services with respect to such activities through agreements,
                  transactions, interests or arrangements which permit a person
                  to share risks or costs, comply with regulatory requirements
                  regarding local ownership or satisfy other objectives
                  customarily achieved through the conduct of the oil and gas
                  business jointly with third parties, including, without
                  limitation, (a) ownership interests in oil and gas properties
                  or gathering systems and (b) Investments and expenditures in
                  the form of or pursuant to operating agreements, processing
                  agreements, farm-in agreements, farm-out agreements,
                  development agreements, area of mutual interest agreements,
                  unitization agreements, pooling arrangements, joint

                                        2

<PAGE>   4



                  bidding agreements, service contracts, joint venture
                  agreements, partnership agreements (whether general or
                  limited), subscription agreements, stock purchase agreements
                  and other similar agreements with third parties (including
                  Unrestricted Subsidiaries); provided, that in the case of any
                  joint venture primarily engaged in processing, gathering,
                  marketing or transporting oil or gas (i) all Debt of such
                  joint venture (other than a joint venture that is an
                  Unrestricted Subsidiary) that would not otherwise constitute
                  Debt of one of the TransTexas Entities shall be deemed Debt of
                  the Borrower in proportion to its direct or indirect ownership
                  interest in such joint venture (other than through an
                  Unrestricted Subsidiary) and (ii) such joint venture shall be
                  reasonably calculated to enhance the value of the reserves of
                  the TransTexas Entities or marketability of production from
                  such reserves; (x) a guaranty by any Subsidiary of the
                  Borrower permitted under the Indenture; (xi) deposits
                  permitted by the definition of Permitted Liens or any
                  extension, renewal or replacement of any of them; (xii) the
                  TTXD Equity Investment (in addition to any contribution by the
                  Borrower pursuant to clause (xiii) below, (xiii) a capital
                  contribution by the Borrower to TTXD or to a joint venture, a
                  partnership, a limited liability company or a similar entity
                  of the Borrower's drilling and energy services business and
                  pipeline services business and related assets, (xiv) an
                  acquisition by the Borrower of tank storage facilities (or the
                  company that owns such facilities) in the vicinity of the TARC
                  Refinery; (xv) guarantees by the Borrower of Debt of TTXD to
                  the extent such Debt relates to assets contributed to TTXD
                  pursuant to clause (xiii) hereof; (xvi) other Investments not
                  in excess of $5 million at any time outstanding, (xvii) loans
                  made (x) to officers, directors and employees of the Borrower
                  or any of its Subsidiaries approved by the applicable Board of
                  Directors (or by an authorized officer), the proceeds of which
                  are used solely to purchase stock or to exercise stock options
                  received pursuant to an employee stock option plan or other
                  incentive plan, in a principal amount not to exceed the
                  purchase price of such stock or the exercise price of such
                  stock options, as applicable, and (y) to refinance loans,
                  together with accrued interest thereon made pursuant to this
                  clause, in each case not in excess of $3 million in the
                  aggregate outstanding at any one time, (xviii) a capital
                  contribution by the Borrower of any or all of its assets to a
                  joint venture, a partnership, a limited liability company or a
                  similar entity, (xix) any deposit or escrow of funds in
                  connection with adjustments to the Lobo Sale purchase price or
                  (xx) the acquisition by the Borrower of TEC Notes as a result
                  of a capital contribution to the Borrower by a Person other
                  than the Lender or any of its Subsidiaries.

         (d) The definition of "Permitted Liens" is hereby amended to read as
follows:

                           "Permitted Liens" shall mean (a) Liens imposed by
                  governmental authorities for taxes, assessments, or other
                  charges not yet due or which are being contested in good faith
                  and by appropriate proceedings, if adequate reserves with
                  respect thereto are maintained on the books of any of the
                  TransTexas Entities in accordance with GAAP; (b) statutory
                  Liens of landlords, carriers, warehousemen, mechanics,
                  materialmen, repairmen, mineral interest owners, or other like
                  Liens arising by operation of law in the ordinary course of
                  business; provided, that (i) the underlying obligations are
                  not overdue for a period of more than 60 days, or (ii) such
                  Liens are being contested in good faith and by appropriate
                  proceedings and adequate reserves with respect thereto are
                  maintained on the books of any of the TransTexas Entities in
                  accordance with GAAP; (c) (i) pledges of assets or deposits of
                  cash or Cash Equivalents to secure the performance of bids,
                  trade contracts (other than

                                        3

<PAGE>   5



                  borrowed money), leases, statutory obligations, surety bonds,
                  performance bonds and other obligations of a like nature
                  incurred in the ordinary course of business (or to secure
                  reimbursement obligations or letters of credit in support of
                  such bonds) in an aggregate amount not in excess of 5% of the
                  SEC PV10 indicated on TransTexas' most recent Reserve Report
                  at the time such pledges or deposits are made or (ii) pledges
                  of assets, the fair market value of which is not in excess of
                  $40 million in the aggregate pledged at any one time, or
                  deposits of cash or Cash Equivalents, in each case, to secure
                  appeal or supersedeas bonds (or to secure reimbursement
                  obligations or letters of credit in support of such bonds);
                  (d) Liens encumbering customary initial deposits and margin
                  deposits securing Swap Obligations or Permitted Hedging
                  Transactions; (e) pledges of assets including, without
                  limitation, the mortgage of a production payment by a Hedging
                  Subsidiary, to secure margin obligations, settlement
                  obligations, reimbursement obligations or letters of credit in
                  connection with Permitted Hedging Transactions; provided that,
                  at the time such pledge is made (or, if such pledge secures
                  future Permitted Hedging Transactions, at the time any such
                  Permitted Hedging Transaction is entered into), the maximum
                  aggregate exposure under such Permitted Hedging Transactions
                  does not exceed the greater of (i) $25 million or (ii) 10% of
                  the SEC PV10 indicated on TransTexas' then most recent Reserve
                  Report; (f) easements, rights-of-way, zoning, similar
                  restrictions and other similar encumbrances or title defects
                  incurred in the ordinary course of business which, in the
                  aggregate, are not material in amount, and which do not in any
                  case materially detract from the value of the property subject
                  thereto (as such property is used by any of the TransTexas
                  Entities) or materially interfere with the ordinary conduct of
                  the business of any of the TransTexas Entities; (g) Liens
                  arising by operation of law in connection with judgments, only
                  to the extent, for an amount and for a period not resulting in
                  an Event of Default with respect thereto; (h) Liens securing
                  Debt or other obligations not in excess of $3 million and
                  Liens existing on the Closing Date; (i) pledges or deposits
                  made in the ordinary course of business in connection with
                  worker's compensation, unemployment insurance, and other types
                  of social security legislation, property insurance and
                  liability insurance; (j) Liens granted on Equipment, Inventory
                  or Receivables; (k) Liens granted in connection with the
                  Presale of Gas, provided that all of the proceeds from such
                  Presale of Gas shall be applied to the repurchase of the Note;
                  (l) Liens created on acreage drilled or to be drilled pursuant
                  to Drilling Programs, on Hydrocarbons produced therefrom and
                  on the proceeds of such Hydrocarbons to secure TransTexas'
                  obligations thereunder, provided that (i) the number of wells
                  included in such program commenced in any fiscal year does not
                  exceed 30 per fiscal year (plus the number of wells included
                  in programs commenced in prior years but not yet completed),
                  (ii) such obligations are limited to a percentage of
                  production from such wells, (iii) such Liens survive only
                  until the Person to whom such Lien was granted has received
                  production with a value equal to the reimbursable costs,
                  expenses and fees related to property and services provided or
                  paid for by such Person plus an agreed-upon interest
                  component, and (iv) such Liens secure obligations that are
                  nonrecourse to each of the Company or its Subsidiaries; (m)
                  Liens on the assets of any entity existing at the time such
                  assets are acquired by any of the TransTexas Entities, whether
                  by merger, consolidation, purchase of assets or otherwise so
                  long as such Liens (A) are not created, incurred or assumed in
                  contemplation of such assets being acquired by any of the
                  TransTexas Entities and (B) do not extend to any other assets
                  of any of the TransTexas Entities; (n) any extension, renewal,
                  or replacement of Liens created pursuant to any of clauses (a)
                  through (g), (i), (k) through (m) or (q) through (t) of this
                  definition, or (r) through (v) ;provided that

                                        4

<PAGE>   6



                  such Liens would have otherwise been permitted under such
                  clauses, and further provided that the Liens permitted by this
                  clause (n) do not secure any additional Debt or encumber any
                  additional property; (o) Liens securing (i) Royalty Payment
                  Obligations and (ii) Permitted Production Payment Obligations;
                  (p) Liens on the assets of one of the TransTexas Entities in
                  favor of another TransTexas Entity; (q) Liens that secure
                  Unrestricted NonRecourse Debt; provided however, that at the
                  time of incurrence the aggregate fair market value of the
                  assets securing such Lien (exclusive of the stock of the
                  applicable Unrestricted Subsidiary) shall not exceed the
                  amount of allowed Unrestricted Non-Recourse Debt of the
                  Borrower; (r) Liens on the proceeds of any property subject to
                  a Permitted Lien or on deposit accounts containing any such
                  proceeds; (s) Liens on the proceeds of any property that is
                  not Collateral, on the proceeds of any Debt incurred in
                  accordance with the provisions hereof, or on deposit accounts
                  containing any such proceeds; (t) Liens (including extensions
                  and renewals thereof) on real or personal property, acquired
                  after the Closing Date ("New TransTexas Property"); provided,
                  however, that (A) such Lien is created solely for the purpose
                  of securing Debt Incurred to finance the cost (including the
                  cost of improvements or construction) of New TransTexas
                  Property subject thereto and such Lien is created at the time
                  of, or within six months after the later of the acquisition,
                  the completion of construction, or the commencement of full
                  operation of such New TransTexas Property, (B) the principal
                  amount of the Debt secured by such Lien does not exceed 100%
                  of such cost plus reasonable financing fees and other
                  associated reasonable out-of-pocket expenses and (C) any such
                  Lien shall not extend to or cover any property or assets other
                  than such item of New TransTexas property and any improvements
                  on such New TransTexas Property; (u) Liens of the trustee
                  under the indenture and related collateral documents governing
                  the terms of the TransTexas Senior Notes and (v) Liens in
                  favor of the Lender or its assignee under the TransTexas
                  Security Documents.

         (e) The definition of "Phase I Completion Date" is hereby amended to
read as follows:

                           "Phase I Completion Date" shall mean the date on
                  which the Construction Supervisor issues a written notice (the
                  "Phase I Completion Notice") to TARC certifying that the Phase
                  I Performance Test has been completed.

         (f) The definition of "Phase I Performance Test" is hereby added to the
TransTexas Intercompany Loan Agreement to read in its entirety as follows:

                           "Phase I Performance Test" means for a period of at
                  least 72 uninterrupted hours, TARC Operating's refinery has
                  sustained (i) an average feedstock throughput level of at
                  least 150,000 barrels per day, and (ii) no net production of
                  vacuum tower bottoms when using as input a combined feedstock
                  slate with an average API Gravity of 22 degrees or less.

         (g) The definition of "Phase II Completion Date" is hereby amended to
read as follows:

                           "Phase II Completion Date" means the date on which
                  the Construction Supervisor issues a written notice (the
                  "Phase II Completion Notice") to the Borrower certifying that
                  for a period of at least 72 uninterrupted hours, TARC
                  Operating's refinery has sustained (i) an average feedstock
                  throughput level of at least 180,000 barrels per day and (ii)
                  average

                                        5

<PAGE>   7



                  production yields (measured as the liquid volume percent of
                  feedstock throughput) of refined products with a specific
                  gravity of gasoline or lighter of at least 40% and of middle
                  distillates or lighter of at least 60%, when using a combined
                  Crude Unit feedstock slate with an average API Gravity of 22
                  degrees or less.

         (h) The definition of "Related TransTexas Business" is hereby amended
to read as follows:

                           "Related TransTexas Business" shall mean (i) the
                  exploration for, acquisition of, development of, production,
                  transportation, gathering, and processing (in connection with
                  natural gas and natural gas liquids only) of, crude oil,
                  natural gas, condensate, and natural gas liquids; provided
                  that the Related TransTexas Business shall not include any
                  refining or distilling of Hydrocarbons other than processing
                  and fractionating natural gas and natural gas liquids, (ii)
                  the drilling and energy services business and pipeline
                  services business, (iii) owning and operating a Hedging
                  Subsidiary or (iv) owning and operating facilities in or near
                  Winnie, Texas, designed for separation, dehydration,
                  treatment, stabilization, processing and storage of
                  hydrocarbons and related operations.

         Section 1.02. Section 2.4 of the TransTexas Intercompany Loan
Agreement. Section 2.4 of the TransTexas Intercompany Loan Agreement is hereby
amended to add a new subsection (b) following subsection (a) to read as follows:

                           (b) Notwithstanding anything to the contrary herein,
                  the Borrower may at any time repay the principal of the Loan
                  by surrender to the Lender for cancellation of 11 1/2% Senior
                  Secured Notes due 2000 of the Lender ("Senior Notes") and at
                  any time after June 15, 1999 repay the principal of the Loan
                  by surrender to the Lender for cancellation of 13% Senior
                  Secured Discount Notes due 2002 ("Senior Discount Notes"), but
                  only to the extent the Borrower has received Senior Notes or
                  Senior Discount Notes or a cash amount equal to the cost to
                  the Borrower of such Senior Notes or Senior Discount Notes as
                  a capital contribution from a person other than the Lender or
                  any of its Subsidiaries. Upon each such surrender of Senior
                  Notes or Senior Discount Notes to the Lender, the principal
                  amount of the Loan shall be reduced by 100.0% of the principal
                  amount of the Senior Notes surrendered and 100.0% of the
                  principal amount of the Senior Discount Notes surrendered.

         Section 1.03. Section 3.2 of the TransTexas Intercompany Loan
Agreement. Section 3.2 of the TransTexas Intercompany Loan Agreement is hereby
amended to read as follows:

                           Section 3.2 Permitted Prepayments. The Borrower may
                  at any time make a prepayment of all or a portion of the
                  principal amount of the Note then outstanding (a "Permitted
                  Prepayment") at a prepayment price equal to the portion of the
                  outstanding principal amount of the Note to be prepaid
                  together with accrued and unpaid interest, if any, to and
                  including the date of such Permitted Prepayment.

         Section 1.04. Section 9.15 of the TransTexas Intercompany Loan
Agreement. A Section 9.15 is hereby added to the TransTexas Intercompany Loan
Agreement to read as follows:

                           Section 9.15 Agreement. The term "Agreement," as used
                  in the TransTexas Intercompany Loan Agreement, and the terms
                  "TransTexas Intercompany Loan Agreement"

                                        6

<PAGE>   8



                  and "Loan Agreement," as used in the other Loan Documents,
                  each shall mean and refer to the TransTexas Intercompany Loan
                  Agreement, as amended, modified, supplemented, restated,
                  renewed, and/or extended from time to time; . . .


                                   ARTICLE II
                                  MISCELLANEOUS

         Section 2.01. Ratification and Confirmation. As amended and modified by
this Second Amendment, the terms and provisions of the TransTexas Intercompany
Loan Agreement are hereby ratified and confirmed and shall continue in full
force and effect.

         Section 2.02. Reference to TransTexas Intercompany Loan Agreement. The
TransTexas Intercompany Loan Agreement and any and all other agreements,
documents or instruments now or hereafter executed and delivered pursuant to the
terms of the TransTexas Intercompany Loan Agreement, are hereby amended so that
any reference therein to the TransTexas Intercompany Loan Agreement shall mean a
reference to the TransTexas Intercompany Loan Agreement as amended hereby.

         Section 2.03. Counterparts. This Second Amendment may be executed in
one or more counterparts, each of which when executed shall be deemed to be an
original, but all of which when taken together shall constitute one and the same
instrument.

         Section 2.04. Headings. The headings, captions and arrangements used in
this Second Amendment are for convenience only and shall not affect the
interpretation of this Second Amendment.

         Section 2.05. Governing Law. THIS SECOND AMENDMENT SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK, WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAWS.

         Section 2.06. Effectiveness of Amendments. This Second Amendment is
effective as of the date first above written. However, the provisions of the
TransTexas Intercompany Loan Agreement amended or eliminated as provided in this
Second Amendment (the "Amended Provisions") shall remain operative in the form
in which they exist in the TransTexas Intercompany Loan Agreement until the
Transaction Closing Date, whereupon the Amended Provisions will be amended or
eliminated as provided herein, effective immediately prior to the Transaction
Closing Date.



                                        7

<PAGE>   9


         IN WITNESS WHEREOF, the parties hereto have caused this Second
Amendment to be executed as of the date of first written above.


                                     TRANSTEXAS GAS CORPORATION



                                     By:
                                        ---------------------------------------
                                     Name:
                                          -------------------------------------
                                     Title:
                                           ------------------------------------




                                     TRANSAMERICAN ENERGY CORPORATION



                                     By:
                                        ---------------------------------------
                                     Name:
                                          -------------------------------------
                                     Title:
                                           ------------------------------------


                                        8


<PAGE>   1


                                                                    EXHIBIT 4.4

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                           TRANSTEXAS GAS CORPORATION

                                       AND

                        TRANSAMERICAN ENERGY CORPORATION

                            ------------------------


                FIRST AMENDMENT TO SECURITY AND PLEDGE AGREEMENT

                          Dated as of December 15, 1998

                           --------------------------



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<PAGE>   2



                FIRST AMENDMENT TO SECURITY AND PLEDGE AGREEMENT

         This First Amendment to Security and Pledge Agreement (this "First
Amendment") is made as of December 15, 1998, by and among TransTexas Gas
Corporation, a Delaware corporation (the "Company"), and TransAmerican Energy
Corporation (the "Lender").

         WHEREAS, the Lender and Firstar Bank of Minnesota, N.A., as Trustee,
have entered into an Indenture dated June 13, 1997, as amended by a First
Amendment thereto dated of even date herewith (the "Indenture"), pursuant to
which Lender issued $475,000,000 aggregate principal amount of its 11 1/2%
Senior Secured Notes due 2002 and $1,130,000,000 aggregate principal amount of
its 13% Senior Secured Discount Notes due 2002 (collectively, the "Notes"); and

         WHEREAS, the Company and the Lender have entered into a Loan Agreement
dated as of June 13, 1997, as amended by a First Amendment to Loan Agreement
dated as of December 30, 1997, and as further amended by a Second Amendment to
Loan Agreement of even date herewith (as so amended, the "TransTexas
Intercompany Loan Agreement"), pursuant to which the Lender has loaned to
TransTexas an aggregate of $450,000,000 out of the proceeds of the issuance of
the Notes; and

         WHEREAS, the Company and the Lender have entered into a Security and
Pledge Agreement dated as of June 13, 1997 (the "Security and Pledge
Agreement"), pursuant to which the Company and the Lender secured the payment
and performance of the obligations of the Company under the TransTexas
Intercompany Loan Agreement; and

         WHEREAS, the Company and the Lender have agreed to an amendment to the
Security and Pledge Agreement as hereinafter set forth (the "Proposed
Amendment"); and

         WHEREAS, pursuant to Section 9.2 of the Indenture, the holders of not
less than 66-2/3% in aggregate Value (as defined in the Indenture) of the Notes
have consented to the Proposed Amendment to the Security and Pledge Agreement;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties to this First
Amendment hereby agree as follows:


                                    ARTICLE I
                   AMENDMENT TO SECURITY AND PLEDGE AGREEMENT

         Section 1.01. Amended Definition. The following definition in Section
1.1 of the Security and Pledge Agreement is hereby amended to read in its
entirety as follows:

                           "Equipment" shall mean and include all now owned or
                  hereafter acquired Vehicles, drilling rigs, workover rigs,
                  fracture stimulation equipment, well site compressors, rolling
                  stock and related equipment and other assets accounted for as
                  equipment in its financial statements, all proceeds thereof,
                  and all documents of title, books, records, ledger cards,
                  files, correspondence and computer files, tapes, disks and
                  related data processing software that at any time evidence or
                  contain information


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                  relating to the foregoing; provided, however, that "Equipment"
                  shall not include any assets constituting part of a natural
                  gas pipeline or the compression or dehydration equipment used
                  in the operation of any such pipeline; provided further,
                  however, notwithstanding the foregoing, "Equipment" shall
                  include (x) production related facilities, (y) assets
                  comprising amine plants and (z) equipment and related assets
                  designed to dehydrate, compress, treat, separate, stabilize,
                  store or otherwise process hydrocarbons, including, without
                  limitation, the facilities at Winnie, Texas (including any
                  real property associated with such facilities at Winnie,
                  Texas).


                                   ARTICLE II
                                  MISCELLANEOUS

         Section 2.01. Ratification and Confirmation. As amended and modified by
this First Amendment, the terms and provisions of the Security and Pledge
Agreement are hereby ratified and confirmed and shall continue in full force and
effect.

         Section 2.02. Reference to Security and Pledge Agreement. The Security
and Pledge Agreement and any and all other agreements, documents or instruments
now or hereafter executed and delivered pursuant to the terms of the Security
and Pledge Agreement, are hereby amended so that any reference therein to the
Security and Pledge Agreement shall mean a reference to the Security and Pledge
Agreement as amended hereby.

         Section 2.03. Counterparts. This First Amendment may be executed in one
or more counterparts, each of which when executed shall be deemed to be an
original, but all of which when taken together shall constitute one and the same
instrument.

         Section 2.04. Headings. The headings, captions and arrangements used in
this First Amendment are for convenience only and shall not affect the
interpretation of this First Amendment.

         Section 2.05. Governing Law. THIS FIRST AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK, INCLUDING
WITHOUT LIMITATION, NEW YORK GENERAL OBLIGATIONS LAW ss.ss. 5-1401 AND 5-1402
AND NEW YORK CIVIL PRACTICE LAW AND RULE 327.

         Section 2.06. Effectiveness of Amendments. This First Amendment is
effective as of the date first above written. However, the provisions of the
Security and Pledge Agreement amended or eliminated as provided in this First
Amendment (the "Amended Provisions") shall remain operative in the form in which
they exist in the Security and Pledge Agreement until the Transaction Closing
Date (as defined in the Indenture), whereupon the Amended Provisions will be
amended or eliminated as provided herein, effective immediately prior to the
Transaction Closing Date.



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         IN WITNESS WHEREOF, the parties hereto have caused this First Amendment
to be executed as of the date of first written above.


                                    TRANSAMERICAN ENERGY CORPORATION,
                                    as Lender


                                    By:
                                       ----------------------------------------
                                    Name:    Ed Donahue                        
                                         --------------------------------------
                                    Title:   Vice President                    
                                          -------------------------------------



                                    TRANSTEXAS GAS CORPORATION


                                    By:
                                       ----------------------------------------
                                    Name:    Ed Donahue                        
                                         --------------------------------------
                                    Title:   Vice President                    
                                          -------------------------------------




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