C2 Transmission output shaft seal - NCRS Discussion Boards

C2 Transmission output shaft seal

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  • Ed S.
    Extremely Frequent Poster
    • August 6, 2014
    • 1377
    #1

    C2 Transmission output shaft seal

    Need advice / recommendation for the correct transmission output shaft seal (rear seal) for a 64 close ration 4 speed. According to one source the correct GM part # is (was) 1243402. I say "was" because I can't find that part # now under any GM listing.

    I have had difficulty cross referencing that GM # to a named brand replacement seal. I have found rear seals by a number of brands but I am not sure I have the correct seal. Timken has a seal and the part # for that part on their website is 9613S.

    Can anyone confirm that is the correct seal - it is available from Rock Auto, for a few dollars plus shipping. Or, can someone recommend a source, including part # for a correct output shaft seal for a 64.

    Thank you
    Ed
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    • Richard G.
      Extremely Frequent Poster
      • July 31, 1984
      • 1715
      #2
      Re: C2 Transmission output shaft seal

      Walk into your local automotive transmission shop they will have one. Same seal as the Power-glide and the THM 350. Every rebuild kit comes with this seal and every 4X4 they rebuild has a seal they don't use. My guess is they will treat you well. Close ratio and wide ratios all take the same seal.
      If you were looking for a part number check the National part number 450308 Oil Seal, or Timken 9613S.
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        • Joe L.
          Beyond Control Poster
          • January 31, 1988
          • 43191
          #3
          Re: C2 Transmission output shaft seal

          Originally posted by Ed Szeliga (60294)
          Need advice / recommendation for the correct transmission output shaft seal (rear seal) for a 64 close ration 4 speed. According to one source the correct GM part # is (was) 1243402. I say "was" because I can't find that part # now under any GM listing.

          I have had difficulty cross referencing that GM # to a named brand replacement seal. I have found rear seals by a number of brands but I am not sure I have the correct seal. Timken has a seal and the part # for that part on their website is 9613S.

          Can anyone confirm that is the correct seal - it is available from Rock Auto, for a few dollars plus shipping. Or, can someone recommend a source, including part # for a correct output shaft seal for a 64.

          Thank you
          Ed-----


          The current GM part number for the seal is GM #8673526. However, it's likely exactly the same seal as National 9613S.
          In Appreciation of John Hinckley
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            • Ed S.
              Extremely Frequent Poster
              • August 6, 2014
              • 1377
              #4
              Re: C2 Transmission output shaft seal

              Richard, Joe,

              Thanks for the quick reply and confirming that the Timken 9613S is the correct seal. I will go with that.

              Ed
              Ed
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