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                      [GARDERE & WYNNE, L.L.P. LETTERHEAD]




(214) 999-3000

                                December 4, 1997


TransAmerican Energy Corporation
1300 North Sam Houston Parkway East
Suite 200
Houston, Texas  77032-2949

Gentlemen:

         We have served as counsel for TransAmerican Energy Corporation, a
Delaware corporation (the "Company"), in connection with the Registration
Statement on Form S-4 (the "Registration Statement") filed with the Securities
and Exchange Commission in connection with the registration under the
Securities Act of 1933, as amended (the "1933 Act"), of (i) $475,000,000
principal amount of the Company's 11 1/2% Senior Secured Notes due 2002, Series
B (the "Senior Secured Notes"), to be offered in exchange for the Company's
outstanding 11 1/2% Senior Secured Notes due 2002, Series A, and (ii)
$1,130,000,000 principal amount of the Company's 13% Senior Secured Discount
Notes due 2002, Series B (the "Senior Secured Discount Notes" and together with
the Senior Secured Notes, the "Notes"), to be offered in exchange for the
Company's outstanding 13% Senior Secured Discount Notes due 2002, Series A.

         We have examined the Registration Statement, the Indenture between the
Company and Firstar Bank of Minnesota, N.A., as Trustee, pursuant to which the
Notes are to be issued (the "Indenture"), the form of the Notes to be issued
and such other documents and such questions of law as we have deemed necessary
to render the opinion expressed below.

         In our examination, we have assumed the genuineness of all signatures,
the legal capacity of all natural persons, the authenticity of all documents
submitted to us as originals, the conformity to original documents of all
documents submitted to us as copies, and the authenticity of the originals of
such copied documents.  We have also assumed that, with respect to all persons
and entities other than the Company, such persons or entities had the power
(corporate or otherwise) to enter into and perform all of their obligations
under the Indenture, the due authorization by all requisite action (corporate
or otherwise) on the part of such persons or entities, the due execution and
delivery by such persons or entities of such document, and the validity and
binding effect thereof.  As to any facts material to the opinion expressed
herein that we did not independently establish or verify, we have relied upon
oral or written statements, certificates and representations of officers and
other representatives of the Company and others.
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TransAmerican Energy Corporation
December 4, 1997
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         Based upon the foregoing, and subject to the qualifications set forth
below, we are of the opinion that when the Notes are executed and authenticated
in accordance with the terms of the Indenture and delivered in the manner and
for the consideration described in the Registration Statement, the Notes will
be binding and enforceable obligations of the Company.

         The opinion expressed above is subject to the following
qualifications:

         A.      The binding nature and enforceability of the Notes may be
limited by (i) bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance or transfer, and other similar laws affecting the enforcement of
creditors' rights generally and (ii) equitable principles of general
application and judicial discretion that may limit or affect the availability
or grant of certain equitable remedies in certain instances.  In addition, the
binding nature and enforceability of certain of the remedial, waiver and other
provisions of the Notes, or of the Indenture for the Notes, may be restricted
by applicable state law, but such restrictions will not, in our opinion, render
the Notes invalid as a whole or substantially interfere with the realization of
the principal legal benefits purported to be provided by the Notes or by the
Indenture for the Notes (except to the extent of any procedural delay which may
result therefrom).  Further, the binding nature and enforceability of the
indemnification provisions of the Indenture for the Notes or the holders
thereof may be limited by public policies embodied in or reflected by various
state and federal securities laws.

         B.      The opinion expressed herein is limited to the laws of the
United States of America, the laws of the State of Texas, and the corporate
laws of the State of Delaware, and we assume no responsibility as to the
applicability or the effect of any other laws.  We have assumed that the laws
of the State of New York, which purport to govern the Notes and the Indenture,
are the same as the laws of the State of Texas with respect to the binding
nature and enforceability of the Notes and (to the extent incorporated in the
Notes) the Indenture for the Notes.

         We consent to the use of this opinion letter as an exhibit to the
Registration Statement and to the use of our name in the Registration Statement
under the heading "Legal Matters."  Our consent, however, is not an admission
that we come within the category of persons whose consent is required under
Section 7 of the 1933 Act or the rules and regulations of the Securities and
Exchange Commission.

                                     Very truly yours,

                                     GARDERE & WYNNE, L.L.P.


                                     By:  /s/ C. ROBERT BUTTERFIELD          
                                        ----------------------------------------
                                          C. Robert Butterfield, Partner