As filed with the Securities and Exchange Commission on June 8, 1998
                                                      Registration No. 33-______

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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                        POST-EFFECTIVE AMENDMENT NO. 1 TO
                                    FORM S-8
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                                  TREADCO, INC.
             (Exact name of registrant as specified in its charter)

                  Delaware                                        71-0706271
      (State or other jurisdiction of                         (I.R.S. Employer
       incorporation or organization)                        Identification No.)

           1101 South 21st Street
            Fort Smith, Arkansas                                    72901
 (Address of principal executive offices)                         (Zip Code)


                    ---------------------------------------
                            TREADCO, INC. EMPLOYEES'
                                 INVESTMENT PLAN
                            (Full title of the plan)
                    ----------------------------------------

                 Richard F. Cooper                            Copy to:
                    Secretary                            Riva Johnson, Esq.
                  Treadco, Inc.                         Jenkens & Gilchrist,
            1101 South 21st Street                   A Professional Corporation
         Fort Smith Arkansas  72901                 1445 Ross Avenue, Suite 3200
               (501) 785-6000                            Dallas, Texas  75202
  (Name, address and telephone number
including area code of agent for service)

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

















                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS


Item 1.  Plan Information.*

Item 2.  Registrant Information and Employee Plan Annual Information.*
- -------------------
   *Information  required  by  Part  I to be  contained  in  the  Section  10(a)
prospectus is omitted from the  Registration  Statement in accordance  with Rule
428 of the Securities Act of 1933, as amended, and the Note to Part I of Form S-
8.


                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT


Item 3.  Incorporation of Documents by Reference.

         The  registrant  and the Plan hereby  incorporate  by reference in this
registration   statement  the  following  documents   previously  filed  by  the
registrant with the Securities and Exchange Commission (the "Commission"):

               (1) the  registrant's  Annual  Report on Form 10-K filed with the
          Commission for the fiscal year ended December 31, 1997;

               (2)  the  registrant's  Quarterly  Report  on Form  10-Q  for the
          quarter ended March 31, 1997, filed with the Commission;

               (3) the registrant's  Registration Statement under the Securities
          Act of 1933 Form S-8 (No. 33- 43393), dated December 27, 1997.

               (4) the  description  of the Common  Stock,  par value  $0.01 per
          share,  of the  registrant  (the  "Common  Stock")  set  forth  in the
          Registration Statement on Form S-1 (No. 33-41605), dated July 3, 1991,
          including  any  amendment  or report filed for the purpose of updating
          such description.

         All documents filed by the registrant  with the Commission  pursuant to
Sections 13(a),  13(c), 14 and 15(d) of the Securities  Exchange Act of 1934, as
amended  (the  "Exchange  Act"),  subsequent  to the  date of this  registration
statement  shall be deemed to be  incorporated  herein by reference  and to be a
part  hereof  from the date of the filing of such  documents  until such time as
there shall have been filed a  post-effective  amendment that indicates that all
securities  offered  hereby have been sold or that  deregisters  all  securities
remaining unsold at the time of such amendment.


Item 8.  Exhibits.

         (a)      Exhibits.

                           The  following  documents are filed as a part of this
                           registration statement.

         Exhibit           Description of Exhibit
         -------           ----------------------

         4.1      Treadco,  Inc. Employees' Investment Plan (previously filed as
                  Exhibit 4.1 to the Company's Form S-8  Registration  Statement
                  under the Securities Act of 1933, as amended (the "Act") dated
                  December  29,  1997,   Commission  File  No.   33-43393,)  and
                  incorporated herein by reference.







         4.2      Amendment No. One to the Treadco,  Inc. Employees'  Investment
                  Plan  (previously  filed as Exhibit 4.2 to the Company's  Form
                  S-8  Registration  Statement  under the Act dated December 29,
                  1997,  Commission File No. 33-43393,) and incorporated  herein
                  by reference.

         4.3      Amendment No. Two to the Treadco,  Inc. Employees'  Investment
                  Plan  (previously  filed as Exhibit 4.3 to the Company's  Form
                  S-8  Registration  Statement  under the Act dated December 29,
                  1997,  Commission File No. 33-43393,) and incorporated  herein
                  by reference.

         4.4      Amendment No. Four to the Treadco,  Inc. Employees' Investment
                  Plan  (previously  filed as Exhibit 4.4 to the Company's  Form
                  S-8  Registration  Statement  under the Act dated December 29,
                  1997,  Commission File No. 33-43393,) and incorporated  herein
                  by reference.

         4.5*     Amendment No. Three to the Treadco, Inc. Employees' Investment
                  Plan.

         4.6*     Restated Amendment No.  Four to the  Treadco, Inc.  Employee's
                  Investment Plan.

         4.7      Certificate of Incorporation of the Company  (previously filed
                  as  Exhibit  3.1  to  the  Company's  Form  S-1   Registration
                  Statement under the Act of 1933 dated July 3, 1991, Commission
                  File No. 33-41605,) and incorporated herein by reference.

         4.8      Bylaws of the Company  (previously filed as Exhibit 3.2 to the
                  Company's Form S-1 Registration  Statement under the Act dated
                  July 3, 1991, Commission File No. 33-41605),  and incorporated
                  herein by reference.

         5.1**    Opinion of Jenkens & Gilchrist, a Professional Corporation.

         23.1***  Consent of Jenkens & Gilchrist, a Professional Corporation.

         23.2*    Consent of Ernst & Young LLP, independent auditors

         24.1* Power of Attorney (on signature page).
- --------------------

*        Filed herewith.

**       No opinion is being furnished  herewith  pursuant to instruction (a) to
         Item 8 of Form S-8 as the Shares  registered  herein  are not  original
         issuance securities.

***      No consent is being filed herewith  pursuant to instruction (a) to Item
         Form S-8, as the Shares  being  registered  are not  original  issuance
         securities.









                                POWER OF ATTORNEY

         KNOW  ALL MEN BY THESE  PRESENTS,  that  each  person  whose  signature
appears below  constitutes and appoints  Richard F. Cooper,  his true and lawful
attorney-in-fact  and agent with full power of substitution and  resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign any
and all amendments  (including  post-effective  amendments) to this registration
statement, and to file the same with all exhibits, thereto, and all documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorney-in-fact and agent, full power and authority to do and perform each
and every  act and thing  requisite  and  necessary  to be done in and about the
premises,  as  fully  to all  intents  and  purposes  as he might or could do in
person, hereby ratifying and confirming all that said attorney-in-fact and agent
or his substitute or substitutes,  may lawfully do or cause to be done by virtue
hereof.

                                   SIGNATURES

         The Registrant.  Pursuant to the  requirements of the Securities Act of
1933, the registrant certifies that it has reasonable grounds to believe that it
meets  all the  requirements  for  filing on Form S-8 and has duly  caused  this
registration statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Fort Smith, State of Arkansas, on May 29, 1998:

                                              TREADCO, INC.


                                              By:       /s/ Richard F. Cooper
                                                        ------------------------
                                                        Name:  Richard F. Cooper
                                                        Title:  Secretary


         Pursuant to the  requirements of the Securities Act, this  registration
statement has been signed by the following  persons in the capacities and on the
dates indicated.





    Signature                                          Capacity                                              Date
    ---------                                          --------                                              ----
                                                                                                   

 /s/ Robert A. Young                      Chairman of the Board, Director                                May 29, 1998
- ---------------------------------
Robert A. Young, III

 /s/ John R. Meyers                       President and Chief Executive Officer                          May 29, 1998
- ---------------------------------         (Principal Executive Officer, Director)
John R. Meyers

 /s/ David E. Loeffler                    Vice President-Chief Financial Officer and                     May 29, 1998
- ---------------------------------         Treasurer (Principal Financial and Accounting
David E. Loeffler                         Officer)

 /s/ Nicolas M. Georgitsis                Director                                                       May 29, 1998
- ---------------------------------
Nicolas M. Georgitsis

 /s/ Robert B. Gilbert                    Director                                                       May 29, 1998
- ---------------------------------
Robert B. Gilbert

 /s/ William A. Marquard                  Director                                                       May 29, 1998
- ----------------------------
William A. Marquard

 /s/ John H. Morris                       Director                                                       May 29, 1998
- ---------------------------------
John H. Morris














         The Plan.
         --------

         Pursuant to the  requirements of the Securities Act, this  Registration
Statement  has  been  signed  by the  following  members  of the  Administrative
Committee of the Treadco, Inc.'s Employees' Investment Plan, in the City of Fort
Smith, State of Arkansas, on the dates indicated.




               Signature                                Title                                    Date
                                                                                       


 /s/ Donald L. Neal                                    Chairman                              May 29, 1998
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Donald L. Neal

 /s/ Richard F. Cooper                                 Member                                May 29, 1998
- ---------------------------------------
Richard F. Cooper

 /s/ John R. Meyers                                    Member                                May 29, 1998
- ---------------------------------------
John R. Meyers

 /s/ Randall M. Loyd                                   Member                                May 29, 1998
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Randall M. Loyd

 /s/ Jay Davidson                                      Member                                May 29, 1998
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Jay Davidson

 /s/ David E. Leoffler                                 Member                                May 29, 1998
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David E. Loeffler

 /s/ J. Lavon Morton                                   Member                                May 29, 1998
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J. Lavon Morton