-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000075362-08-000025.txt : 20080115
<SEC-HEADER>0000075362-08-000025.hdr.sgml : 20080115
<ACCEPTANCE-DATETIME>20080115121727
ACCESSION NUMBER:		0000075362-08-000025
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080111
FILED AS OF DATE:		20080115
DATE AS OF CHANGE:		20080115

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PACCAR INC
		CENTRAL INDEX KEY:			0000075362
		STANDARD INDUSTRIAL CLASSIFICATION:	MOTOR VEHICLES & PASSENGER CAR BODIES [3711]
		IRS NUMBER:				910351110
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		PACCAR BUILDING
		STREET 2:		777 106TH AVENUE NE
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98004
		BUSINESS PHONE:		425 468 7383

	MAIL ADDRESS:	
		STREET 1:		PACCAR BUILDING
		STREET 2:		777 106TH AVENUE NE
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98004

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PACIFIC CAR & FOUNDRY CO
		DATE OF NAME CHANGE:	19720707

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BARKLEY MICHAEL T
		CENTRAL INDEX KEY:			0001384380

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14817
		FILM NUMBER:		08530475

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		425 468 7431

	MAIL ADDRESS:	
		STREET 1:		777 106TH AVENUE NE
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98004
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-01-11</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000075362</issuerCik>
        <issuerName>PACCAR INC</issuerName>
        <issuerTradingSymbol>PCAR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001384380</rptOwnerCik>
            <rptOwnerName>BARKLEY MICHAEL T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>777 106TH AVENUE NE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BELLEVUE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VICE PRESIDENT/CONTROLLER</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <postTransactionAmounts>
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                    <value>490</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
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                <natureOfOwnership>
                    <value></value>
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        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>COMMON STOCK (ESPP)</value>
                <footnoteId id="F1"/>
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            <postTransactionAmounts>
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                    <value>5.85</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <transactionDate>
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            <transactionCoding>
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            <transactionAmounts>
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                <transactionPricePerShare>
                    <value>47.47</value>
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                <transactionAcquiredDisposedCode>
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            <ownershipNature>
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        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
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                <transactionCode>J</transactionCode>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
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        <nonDerivativeTransaction>
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                    <value>.1</value>
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                <transactionPricePerShare>
                    <value>51.95</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <postTransactionAmounts>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>COMMON STOCK (SIP)</value>
            </securityTitle>
            <transactionDate>
                <value>2008-01-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F7"/>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <ownershipNature>
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                    <value>D</value>
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                <natureOfOwnership>
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        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
                <value>2008-01-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F8"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>226.709</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>49.62</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12608.099</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>STOCK OPTION</value>
                <footnoteId id="F9"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>25.30</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2007-01-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-01-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>COMMON STOCK</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6958</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>STOCK OPTION</value>
                <footnoteId id="F9"/>
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            <conversionOrExercisePrice>
                <value>32.11</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2008-01-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2015-01-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>COMMON STOCK</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
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        <derivativeHolding>
            <securityTitle>
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                <footnoteId id="F9"/>
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            <conversionOrExercisePrice>
                <value>32.23</value>
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            <exerciseDate>
                <value>2009-01-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2016-01-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>STOCK OPTION</value>
                <footnoteId id="F9"/>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>2010-01-01</value>
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            <expirationDate>
                <value>2017-01-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>COMMON STOCK</value>
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                <underlyingSecurityShares>
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                    <value>8925</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>COMMON STOCK (DCP)</value>
                <footnoteId id="F10"/>
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            <conversionOrExercisePrice>
                <footnoteId id="F10"/>
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            <exerciseDate>
                <footnoteId id="F10"/>
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            <expirationDate>
                <footnoteId id="F10"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>COMMON STOCK</value>
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                <underlyingSecurityShares>
                    <value>8.06</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>420.12</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
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        </derivativeHolding>
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    <footnotes>
        <footnote id="F1">Shares held in PACCAR Inc Employee Stock Purchase Plan (ESPP).</footnote>
        <footnote id="F2">Shares held in PACCAR Savings Investment Plan (SIP).</footnote>
        <footnote id="F3">Interest on funds held in SIP pending investment in shares reinvested in shares October 17, 2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F4">Interest on funds held in SIP pending investment in shares reinvested in shares November 16, 2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F5">December 5, 2007 dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F6">Interest on funds held in SIP pending investment in shares reinvested in shares December 12/18/2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F7">January 7, 2008 dividend on SIP shares reinvested pursuant to SIP.</footnote>
        <footnote id="F8">Shares awarded January 10, 2008 under SIP.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F9">Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP).</footnote>
        <footnote id="F10">Share units held in deferred phantom stock account under PACCAR Deferred Incentive Compensation Plan (DCP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>M. T. Barkley</signatureName>
        <signatureDate>2008-01-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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