Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Item 502(b). On July 23, 2008 Michael A. Tembreull, 61, Vice Chairman and a
Director of PACCAR Inc, announced that he plans to retire from the Company and resign from the Board of Directors effective January 2, 2009 after 38 years with the Company.

Item 502 (c). Thomas E. Plimpton, 59, is elected Vice Chairman of the Company
effective September 1, 2008. Mr. Plimpton has served as President of the Company since 2003 and will succeed Mr. Tembreull as principal financial officer upon Mr. Tembreull's retirement on January 2, 2009.

James G. Cardillo, 59, is elected to succeed Mr. Plimpton as President of the Company effective September 1, 2008. Mr. Cardillo has served as Executive Vice President of the Company from 2006; Senior Vice President from 2004 to 2006 and Vice President from 1999 to 2004.

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 July 23, 2008 Regarding Executive Promotions

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: July 24, 2008 By: /s/ D.C. Anderson

D. C. Anderson Vice President and General Counsel