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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001104659-06-039973.txt : 20060606
<SEC-HEADER>0001104659-06-039973.hdr.sgml : 20060606
<ACCEPTANCE-DATETIME>20060606135126
ACCESSION NUMBER:		0001104659-06-039973
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060525
FILED AS OF DATE:		20060606
DATE AS OF CHANGE:		20060606

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SULLIVAN ROBERT S
		CENTRAL INDEX KEY:			0001207082

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11443
		FILM NUMBER:		06888735

	MAIL ADDRESS:	
		STREET 1:		P O BOX 1637
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77251

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			STEWART & STEVENSON SERVICES INC
		CENTRAL INDEX KEY:			0000094328
		STANDARD INDUSTRIAL CLASSIFICATION:	ENGINES & TURBINES [3510]
		IRS NUMBER:				741051605
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			0131

	BUSINESS ADDRESS:	
		STREET 1:		2707 N LOOP W
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77008
		BUSINESS PHONE:		7138687700

	MAIL ADDRESS:	
		STREET 1:		P O BOX 1637
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77251-1637
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
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    <periodOfReport>2006-05-25</periodOfReport>

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        <issuerName>STEWART &amp; STEVENSON SERVICES INC</issuerName>
        <issuerTradingSymbol>SVC</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>SULLIVAN ROBERT S</rptOwnerName>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77251-1637</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <transactionDate>
                <value>2006-05-25</value>
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            <transactionCoding>
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            <transactionTimeliness>
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                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
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                <footnoteId id="F3"/>
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            <expirationDate>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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        <derivativeTransaction>
            <securityTitle>
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            <conversionOrExercisePrice>
                <value>14.5625</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-05-25</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2001-06-13</value>
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            <conversionOrExercisePrice>
                <value>33.90</value>
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            <transactionDate>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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                <transactionPricePerShare>
                    <value>19.77</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <directOrIndirectOwnership>
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            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
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            <transactionDate>
                <value>2006-05-25</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
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                <transactionShares>
                    <value>5000</value>
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                <transactionPricePerShare>
                    <value>14.10</value>
                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>2006-06-07</value>
                <footnoteId id="F3"/>
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                <value>2015-06-07</value>
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                    <value>0</value>
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    <footnotes>
        <footnote id="F1">Disposed of pursuant to Agreement and Plan of Merger (the &quot;Merger Agreement&quot;) dated as of February 27, 2006, as amended, by and among Stewart &amp; Stevenson Services, Inc., Armor Holdings, Inc. and Santana Acquisition Corp., in exchange for $36.50 for each share of common stock of the issuer held by the reporting person.</footnote>
        <footnote id="F2">Cancelled pursuant to the Merger Agreement in exchange for a cash payment equal to the product of the number of shares of common stock subject to the option multiplied by the excess, if any, of $36.50 over the exercise price per share of common stock under such option.</footnote>
        <footnote id="F3">The stock option becomes exercisable following the first year anniversary of the date of grant</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Robert S. Sullivan</signatureName>
        <signatureDate>2006-05-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----