8-K

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): June 13, 2006

PACCAR Inc

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction
of incorporation) 001-14817
(Commission
File Number) 91-0351110
(IRS Employer
Identification No.)

777 106^th Avenue NE, Bellevue, WA 98004
(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code (425) 468-7400

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

TABLE OF CONTENTS

	Item 5.02 Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers
	Item 9.01 Financial Statements and Exhibits
SIGNATURES
EXHIBIT 99.1

Item 5.02 Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers

On June 13, 2006, the PACCAR Inc Board of Directors elected Charles R. Williamson to the Board of Directors, effective July 1, 2006. Mr. Williamson will join the Compensation Committee of the Board of Directors. There are no reportable transactions under Item 404 (a) of Regulation S-K. A copy of the press release announcing the election is attached as Exhibit 99.1 to this Report.

Item 9.01 Financial Statements and Exhibits

(c) Exhibits.

The following are furnished as Exhibits to this Report.

Exhibit Number	Description
99.1	Press release of June 16, 2006 regarding Charles R. Williamson

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		PACCAR Inc
Date:	June 19, 2006	By:	/s/ D. C. Anderson
			D. C. Anderson
			Vice President and General Counsel

EX-99.1

Exhibit 99.1

Charles R. Williamson Named to PACCAR Board

June 16, 2006, Bellevue, Washington — Mr. Charles R. Williamson has been named to PACCAR Inc’s Board of Directors, effective July 1, 2006, according to Mark C. Pigott, PACCAR chairman and chief executive officer.

Charles R. Williamson was chairman and chief executive officer of Unocal, the California-based energy company, from 2001 until Unocal merged with Chevron in August 2005. He served as a director of Unocal from 2000 to 2005. During his excellent 28-year career with Unocal, he served in a variety of technical and management positions around the world including positions in the United Kingdom, Thailand and the Netherlands. Mr. Williamson was the chairman of the US-ASEAN Business Council from 2002-2005. He earned a Ph.D in geology from the University of Texas. He is a director of the Weyerhaeuser Company (NYSE:WY) and Talisman Energy Inc. (NYSE:TLM).

“PACCAR is very pleased that Mr. Williamson will be joining the Board. His thorough understanding of the Asian marketplace and his background in operations provide a strong perspective that will benefit PACCAR in its global growth,” said Mark Pigott.

PACCAR is a global technology leader in the design, manufacture and customer support of high-quality light-, medium- and heavy-duty trucks under the Kenworth, Peterbilt and DAF nameplates. It also provides financial services and information technology and distributes truck parts related to its principal business.

PACCAR shares are traded on the Nasdaq Stock Market, symbol PCAR, and its homepage can be found at www.paccar.com.