Ownership Submission
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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(Print or Type Responses)
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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