FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * PLIMPTON THOMAS E   2. Issuer Name and Ticker or Trading Symbol PACCAR INC [PCAR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice Chairman (Last) (First) (Middle) 777 106TH AVENUE NE 3. Date of Earliest Transaction (Month/Day/Year) 01/13/2011 (Street) BELLEVUE, WA 98004 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price COMMON STOCK               49,691 D   COMMON STOCK (SIP) (1) 01/13/2011   J(2)   98.467 A $ 55.62 45,734.812 D   COMMON STOCK (SIP) (1) 01/13/2011   J(3)   237.797 A $ 57.7 45,972.609 D   COMMON STOCK (SIP) (1) 01/13/2011   A(4)   167.831 A $ 43.79 46,140.44 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

STOCK OPTION (5)

$ 25.31

01/01/2007

01/15/2014

COMMON STOCK

25,255

25,255

D

STOCK OPTION (5)

$ 32.11

01/01/2008

01/20/2015

COMMON STOCK

63,990

63,990

D

STOCK OPTION (5)

$ 32.23

01/01/2009

01/26/2016

COMMON STOCK

60,354

60,354

D

STOCK OPTION (5)

$ 44.56

01/01/2010

01/31/2017

COMMON STOCK

46,635

46,635

D

STOCK OPTION (5)

$ 45.74

01/01/2011

01/30/2018

COMMON STOCK

41,636

41,636

D

STOCK OPTION (5)

$ 30.81

01/01/2012

01/31/2019

COMMON STOCK

83,030

83,030

D

STOCK OPTION (5)

$ 36.12

01/01/2013

02/02/2020

COMMON STOCK

79,700

79,700

D

COMMON STOCK (LTIP) (6)

(6)

(6)

(6)

COMMON STOCK

7,690.42

7,690.42

D

COMMON STOCK (DICP) (7)

(7)

(7)

(7)

COMMON STOCK

4,317.22

4,317.22

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
PLIMPTON THOMAS E 777 106TH AVENUE NE BELLEVUE, WA 98004	X		Vice Chairman

Signatures

Thomas E. Plimpton by David C. Anderson POA		01/18/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Shares held in PACCAR Savings Investment Plan (SIP).
(2)	December 6, 2010 dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP. (SIP information based on most recent report from SIP trustee - received January 13, 2011).
(3)	December 29, 2010 dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP. (SIP information based on most recent report from SIP Trustee - received January 13, 2011.)
(4)	Shares awarded January 12, 2011 under SIP. (SIP information based on most recent report from SIP trustee - received January 13, 2011).
(5)	Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP).
(6)	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.
(7)	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.

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