<SUBMISSION>
<ACCESSION-NUMBER>0001127602-17-014265
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20170404
<FILING-DATE>20170405
<DATE-OF-FILING-DATE-CHANGE>20170405
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Metaldyne Performance Group Inc.
<CIK>0001616817
<ASSIGNED-SIC>3714
<IRS-NUMBER>471420222
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>ONE TOWNE SQUARE
<STREET2>SUITE 550
<CITY>SOUTHFIELD
<STATE>MI
<ZIP>48076
<PHONE>248-727-1800
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE TOWNE SQUARE
<STREET2>SUITE 550
<CITY>SOUTHFIELD
<STATE>MI
<ZIP>48076
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Grimm Douglas J.
<CIK>0001626219
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-36774
<FILM-NUMBER>17741578
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O METALDYNE PERFORMANCE GROUP INC.
<STREET2>47659 HALYARD DRIVE
<CITY>PLYMOUTH
<STATE>MI
<ZIP>48170
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-04-04</periodOfReport>

    <issuer>
        <issuerCik>0001616817</issuerCik>
        <issuerName>Metaldyne Performance Group Inc.</issuerName>
        <issuerTradingSymbol>MPG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001626219</rptOwnerCik>
            <rptOwnerName>Grimm Douglas J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O METALDYNE PERFORMANCE GROUP INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE TOWNE SQUARE, SUITE 550</rptOwnerStreet2>
            <rptOwnerCity>SOUTHFIELD</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>48076</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Pres &amp; Chief Operating Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, Par Value $0.001 Per Share</value>
            </securityTitle>
            <transactionDate>
                <value>2017-04-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10635</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.15</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>360711</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks>18,788 shares vested (33% of the award) and 10,635 were withheld for the tax liability required at the time of vesting.</remarks>

    <ownerSignature>
        <signatureName>Douglas J. Grimm</signatureName>
        <signatureDate>2017-04-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
