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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 2jB7GTeco71qAzfmhJZCaQ==

<SEC-DOCUMENT>0000933405-04-000019.txt : 20040402
<SEC-HEADER>0000933405-04-000019.hdr.sgml : 20040402
<ACCEPTANCE-DATETIME>20040402142804
ACCESSION NUMBER:		0000933405-04-000019
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040401
FILED AS OF DATE:		20040402

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AFTERMARKET TECHNOLOGY CORP
		CENTRAL INDEX KEY:			0000933405
		STANDARD INDUSTRIAL CLASSIFICATION:	MOTOR VEHICLE PARTS & ACCESSORIES [3714]
		IRS NUMBER:				954486486
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE OAK HILL CENTER
		STREET 2:		SUITE 400
		CITY:			WESTMONT
		STATE:			IL
		ZIP:			60559
		BUSINESS PHONE:		6304556000

	MAIL ADDRESS:	
		STREET 1:		ONE OAK HILL CENTER
		STREET 2:		SUITE 400
		CITY:			WESTMONT
		STATE:			IL
		ZIP:			60559

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JOHNSON DONALD T JR
		CENTRAL INDEX KEY:			0001275938

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21803
		FILM NUMBER:		04713140

	MAIL ADDRESS:	
		STREET 1:		ONE OAK HILL CENTER STE 400
		STREET 2:		C/O AFTERMARKET TECHNOLOGY CORP
		CITY:			WESTMONT
		STATE:			IL
		ZIP:			60559
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-04-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000933405</issuerCik>
        <issuerName>AFTERMARKET TECHNOLOGY CORP</issuerName>
        <issuerTradingSymbol>ATAC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001275938</rptOwnerCik>
            <rptOwnerName>JOHNSON DONALD T JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE OAK HILL CENTER STE 400</rptOwnerStreet1>
            <rptOwnerStreet2>C/O AFTERMARKET TECHNOLOGY CORP</rptOwnerStreet2>
            <rptOwnerCity>WESTMONT</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60559</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>11044</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.49</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>63956</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares withheld to pay tax liability related to the vesting of restricted stock.</footnote>
        <footnote id="F2">Includes 37,500 shares of restricted stock that will vest on April 1, 2005.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Donald T. Johnson, Jr.</signatureName>
        <signatureDate>2004-04-01</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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