UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                           Wabash National Corporation
                                (Name of Issuer)

                          Common Stock, $0.01 par value
                         (Title of Class of Securities)

                                    929566107
                                 (CUSIP Number)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

   [X] Rule 13d-1(b)
   [_] Rule 13d-1(c)
   [_] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                                       13G

--------------------------------------------------------------------------------
 1     NAME OF REPORTING PERSON
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

       Wells Fargo & Company
       Tax Identification No. 41-0449260
--------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [_]
                                                                         (b) [_]
--------------------------------------------------------------------------------
 3     SEC USE ONLY

--------------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware
--------------------------------------------------------------------------------
                      5   SOLE VOTING POWER

    NUMBER OF             1,283,895
     SHARES         ------------------------------------------------------------
                      6   SHARED VOTING POWER
  BENEFICIALLY
    OWNED BY              0
                    ------------------------------------------------------------
      EACH            7   SOLE DISPOSITIVE POWER

    REPORTING             1,304,538
      PERSON        ------------------------------------------------------------
                      8   SHARED DISPOSITIVE POWER
      WITH
                          15,158
--------------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,306,233
--------------------------------------------------------------------------------
10     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

       Not applicable
--------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.1%
--------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON

       HC
--------------------------------------------------------------------------------

                                        2



                                       13G

--------------------------------------------------------------------------------
 1     NAME OF REPORTING PERSON
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

       Wells Capital Management Incorporated
       Federal ID No.  95-3692822
--------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [_]
                                                                         (b) [_]
--------------------------------------------------------------------------------
 3     SEC USE ONLY

--------------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION

       California
--------------------------------------------------------------------------------
                      5   SOLE VOTING POWER

    NUMBER OF             1,282,200
     SHARES         ------------------------------------------------------------
                      6   SHARED VOTING POWER
  BENEFICIALLY
    OWNED BY              0
                    ------------------------------------------------------------
      EACH            7   SOLE DISPOSITIVE POWER

    REPORTING             1,301,858
      PERSON        ------------------------------------------------------------
                      8   SHARED DISPOSITIVE POWER
      WITH
                          0
--------------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,301,858
--------------------------------------------------------------------------------
10     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

       Not applicable
--------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5%
--------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON

       IA
--------------------------------------------------------------------------------

                                       3



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934

DISCLAIMER: Information in this Schedule 13G is provided solely for the purpose
of complying with Sections 13(d) and 13(g) of the Act and regulations
promulgated thereunder, and is not to be construed as an admission that Wells
Fargo & Company or any of its subsidiaries is the beneficial owner of the
securities covered by this Schedule 13G for any purpose whatsoever.

Item 1(a)  Name of Issuer:

           Wabash National Corporation

Item 1(b)  Address of Issuer's Principal Executive Offices:

           1000 Sagamore Parkway South
           Lafayette, IN 47905

Item 2(a)  Name of Person Filing:

           Wells Fargo & Company
           Wells Capital Management Incorporated

Item 2(b)  Address of Principal Business Office or, if None, Residence:

           1.  Wells Fargo & Company
               420 Montgomery Street
               San Francisco, CA 94104

           2.  Wells Capital Management Incorporated
               525 Market Street, 10th Floor
               San Francisco, CA 94104

Item 2(c)  Citizenship:

           1.  Wells Fargo & Company: Delaware
           2.  Wells Capital Management Incorporated: California

Item 2(d)  Title of Class of Securities:

           Common Stock, $0.01 par value

Item 2(e)  CUSIP Number:

           929566107

Item 3     The person filing is a:

           1.  Wells Fargo & Company: Parent Holding Company in accordance with
               240.13d-1(b)(1)(ii)(G)

                                       4



           2.  Wells Capital Management Incorporated: Registered Investment
               Advisor in accordance with Regulation 13d-1(b)(1)(ii)(E)

Item 4     Ownership:

           See 5-11 of each cover page. Information as of December 31, 2003.

Item 5     Ownership of Five Percent or Less of a Class:

           If this statement is being filed to report the fact that as of the
           date hereof the reporting person has ceased to be the beneficial
           owner of more than five percent of the class of securities, check the
           following [_].

Item 6     Ownership of More than Five Percent on Behalf of Another Person:

           Not applicable.

Item 7     Identification and Classification of the Subsidiary Which Acquired
           the Security Being Reported on by the Parent Holding Company:

           See Attachment A

Item 8     Identification and Classification of Members of the Group:

           Not Applicable

Item 9     Notice of Dissolution of Group:

           Not Applicable

Item 10    Certification:

           By signing below I certify that, to the best of my knowledge and
           belief, the securities referred to above were acquired and are held
           in the ordinary course of business and were not acquired and are not
           held for the purpose of or with the effect of changing or influencing
           the control of the issuer of the securities and were not acquired and
           are not held in connection with or as a participant in any
           transaction having that purpose or effect.

Date:  February 12, 2004

WELLS FARGO & COMPANY



By: /s/ Laurel A. Holschuh
    -----------------------------------------------
         Laurel A. Holschuh, Senior Vice President
          and Secretary

                                        5



                                  ATTACHMENT A

The Schedule 13G to which this attachment is appended is filed by Wells Fargo &
Company on behalf of the following subsidiaries:

     First Allied Securities, Inc. (1)(2)
     Wells Capital Management Incorporated (1)
     Wells Fargo Bank Minnesota, National Association (3)
     Wells Fargo Funds Management, LLC (1)

     (1) Classified as a registered investment advisor in accordance with
Regulation 13d-1(b)(1)(ii)(E).
     (2) Classified as a broker dealer in accordance with Regulation
13d-1(b)(1)(ii)(A).
     (3) Classified as a bank in accordance with Regulation
13d-1(b)(1)(ii)(B).
                                        6



                                   AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G to which this
Agreement is attached shall be filed by Wells Fargo & Company on its own behalf
and on behalf of Wells Capital Management Incorporated.


Dated:  February 12, 2004

WELLS FARGO & COMPANY



By: /s/ Laurel A. Holschuh
    -----------------------------------------------
         Laurel A. Holschuh, Senior Vice President
          and Secretary



WELLS CAPITAL MANAGEMENT INCORPORATED



By: /s/ Monica Poon
    -----------------------------------------------
         Monica Poon, Senior Vice President and
          Chief Compliance Officer

                                       7