PACCAR INC — Director's Dealing 2006

May 4, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PACCAR INC (PCAR)
CIK: 0000075362
Period of Report: 2006-05-02

Reporting Person: PLIMPTON THOMAS E (PRESIDENT)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-02	COMMON STOCK	M	10000	$22.94	Acquired	15365	Direct
2006-05-02	COMMON STOCK	S	10000	$72.64	Disposed	5365	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2006-05-02	STOCK OPTION	$22.94	M	10000	Disposed	2011-01-24	COMMON STOCK (10000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
COMMON STOCK (SIP)	17625.9	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
STOCK OPTION	$28.20	2012-01-23	COMMON STOCK (40263)	40263	Direct
STOCK OPTION	$31.40	2013-01-15	COMMON STOCK (45168)	45168	Direct
STOCK OPTION	$56.95	2014-01-15	COMMON STOCK (24558)	24558	Direct
STOCK OPTION	$72.25	2015-01-20	COMMON STOCK (28440)	28440	Direct
STOCK OPTION	$72.51	2016-01-26	COMMON STOCK (26824)	26824	Direct
COMMON STOCK (LTIP)	$		COMMON STOCK (3030.3)	3030.3	Direct
COMMON STOCK (DICP)	$		COMMON STOCK (1701.2)	1701.2	Direct

Footnotes

F1: Shares held in PACCAR Savings Investment Plan (SIP).

F2: Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP).

F3: Share units held in deferred phantom stock account under LTIP convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions.

F4: Share units held in deferred phantom stock account under PACCAR Deferred Incentive Compensation Plan (DICP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions.