UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                                               OMB APPROVAL
                                                       -------------------------
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                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                                 (RULE 13d-102)

                 INFORMATION TO BE INCLUDED IN STATEMENTS FILED
          PURSUANT TO RULE 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO
                         FILED PURSUANT TO RULE 13d-2(b)

                               (AMENDMENT NO. __)*


                          Navistar International Corp.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    63934E108
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                November 18, 2002
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


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).




POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION  CONTAINED
IN THIS FORM ARE NOT  REQUIRED TO RESPOND  UNLESS THE FORM  DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.



                               Page 1 of 4 pages



                                  SCHEDULE 13G
                                  ------------


Issuer:  Navistar International Corp.                       CUSIP No.: 63834E108
--------------------------------------------------------------------------------

1.        Names of Reporting Persons.
          I.R.S. Identification Nos. of above persons (entities only).

          MacKay Shields LLC

          13-2631681
          ----------------------------------------------------------------------
--------------------------------------------------------------------------------

2.        Check the Appropriate Box if a Member of a Group (See Instructions)

          (a)
               -----------------------------------------------------------------
          (b)
               -----------------------------------------------------------------

--------------------------------------------------------------------------------
3.        SEC Use Only
                         -------------------------------------------------------
--------------------------------------------------------------------------------
4.        Citizenship or Place of Organization   Delaware
                                                 -------------------------------
--------------------------------------------------------------------------------
Number of Shares         5.   Sole Voting Power   3,513,503
Beneficially Owned       -------------------------------------------------------
by Each Reporting        6.   Shared Voting Power
Person With:             -------------------------------------------------------
                         7.   Sole Dispositive Power 3,513,503
                         -------------------------------------------------------
                         8.   Shared Dispositive Power
                         -------------------------------------------------------
--------------------------------------------------------------------------------
9.        Aggregate Amount Beneficially Owned by Each Reporting Person 3,513,503
                                                                       ---------
10.       Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
          Instructions)
                       ---------------------------------------------------------
11.       Percent of Class Represented by Amount in Row (9) 5.15%
                                                            --------------------
--------------------------------------------------------------------------------
12.       Type of Reporting Person (See Instructions)
--------------------------------------------------------------------------------
IA
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------



                               Page 2 of 4 Pages


                                  SCHEDULE 13G
                                  ------------


Issuer:  Navistar International Corp.                       CUSIP No.: 63834E108
--------------------------------------------------------------------------------

ITEM 1(a).     NAME OF ISSUER:

               Navistar International Corp.

ITEM 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               201 Winfield, PO Box 1488, Warrenville, IL 60555

ITEM 2(a).     NAME OF PERSON FILING:

               MacKay Shields LLC

ITEM 2(b).     ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE OF
               FILING PERSON:

               9 West 57th Street, New York, NY 10019

ITEM 2(c).     CITIZENSHIP OF FILING PERSON:

               Delaware

ITEM 2(d).     TITLE OF CLASSES OF SECURITIES:

               Common Stock

ITEM 2(e).     CUSIP NUMBERS:

               63934E108

ITEM 3.        IF THIS STATEMENT IS FILED PURSUANT TO RULES  13D-1(B),  OR
               13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:


(a)      [_] Broker or dealer  registered under Section 15 of the Act (15 U.S.C.
         78o).

(b)      [_] Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)      [_]  Insurance  company as defined in Section  3(a)(19)  of the Act (15
         U.S.C. 78c).

(d)      [_]  Investment  company  registered  under Section 8 of the Investment
         Company Act of 1940 (15 U.S.C. 80a-8).

(e)      [X] An investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E);

(f)      [_] An employee  benefit  plan or  endowment  fund in  accordance  with
         ss.240.13d-1(b)(1)(ii)(F);

(g)      [_] A parent  holding  company or  control  person in  accordance  with
         ss.240.13d-1(b)(1)(ii)(G);

(h)      [_] A savings  associations  as defined in Section  3(b) of the Federal
         Deposit Insurance Act (12 U.S.C. 1813);

(i)      [_] A church plan that is excluded from the definition of an investment
         company under section  3(c)(14) of the  Investment  Company Act of 1940
         (15 U.S.C. 80a-3);

(j)      [_] Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).



                               Page 3 of 4 Pages




                                  SCHEDULE 13G
                                  ------------


Issuer:  Navistar International Corp.                       CUSIP No.: 63834E108
--------------------------------------------------------------------------------


ITEM 4. OWNERSHIP.

         MacKay Shields LLC, an investment  adviser registered under Section 203
of the Investment  Advisers Act of 1940, is deemed to be the beneficial owner of
3,513,503  shares or 5.15% of the Common Stock  believed to be  outstanding as a
result of acting as investment  adviser to various  clients.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

         Not Applicable.

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

         MacKay Shields LLC, an investment  adviser registered under Section 203
of the Investment  Advisers Act of 1940, is deemed to be the beneficial owner of
3,513,503  shares or 5.15% of the Common Stock  believed to be  outstanding as a
result of acting as  investment  adviser to various  clients.  Clients of MacKay
Shields  LLC have the right to  receive  and the  ultimate  power to direct  the
receipt of dividends from, or the proceeds of the sale of, such securities.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
        SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL
        PERSON.

         Not Applicable.

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.


                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information in this statement is true, complete and correct.

Date: February 14, 2003            MACKAY SHIELDS LLC


                                   /S/ RUSSELL A. THOMPSON
                                   --------------------------
                                   BY:      RUSSELL A. THOMPSON
                                   Title:   Chief Compliance Officer



                               Page 4 of 4 Pages