**UNITED      STATES**

**SECURITIES      AND EXCHANGE COMMISSION**

**Washington,      D.C. 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): September 21,      2006**

**NAVISTAR      INTERNATIONAL CORPORATION**

| Delaware                                                                                    |   | 1-9618                               |   | 36-3359573                                                        |
|---------------------------------------------------------------------------------------------|--------|--------------------------------------|--------|-------------------------------------------------------------------|
|                                                                                             |   |                                      |   |                                                                   |
| (State                or other jurisdiction ofincorporation                or organization) |   | (Commission                File No.) |   | (I.R.S.                EmployerIdentification                No.) |

| 4201                Winfield Road, P.O. Box 1488, Warrenville, Illinois |   | 60555                     |
|-------------------------------------------------------------------------|--------|---------------------------|
|                                                                         |   |                           |
| (Address                of principal executive offices)                 |   | (Zip                Code) |

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**ITEM      **
**1.01**
**ENTRY      INTO A MATERIAL DEFINITIVE AGREEMENT**

**ITEM      5.02**
**DEPARTURE      OF DIRECTORS OR PRINCIPAL OFFICERS; ELECTION OF DIRECTORS; APPOINTMENT OF      PRINCIPAL OFFICERS**

**ITEM      9.01 **
**FINANCIAL      STATEMENTS AND EXHIBITS**

|   | (d)  | Exhibits                   |   |                                                  |   |   |
|--------|-----------|----------------------------|--------|-------------------------------------------------------|--------|--------|
|   |      |                       |   |                                                  |   |   |
|   |      | Exhibit                No. |   | Description                                           |   | Page   |
|   |      |                            |   |                                                       |   |        |
|   |      |                       |   |                                                  |   |   |
|   |      | 99.1                       |   | Press                Release dated September 21, 2006 |   | E-1    |

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| Date:                September 21, 2006 | /s/                William A. Caton                                                                               |
|-----------------------------------------|-------------------------------------------------------------------------------------------------------------------|
|                                    |                                                                                                                   |
|                                    | William                A. CatonExecutive                Vice President and Chief Financial                Officer |