C3 Muncie Clunking

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  • Frank K.
    Expired
    • May 1, 2004
    • 0
    #1

    C3 Muncie Clunking

    Group, i have a 1971 LT1 with 64k on the original M21 CR trans. All is well for the first 15 minutes until the oil is warmed up. At that point the trans has a hard time up or down shifting to 3rd gear. It is kind of a grinding feel. I have changed the fluid but no difference. The trans shifts perfect for the first 15 minutes or so. Sounds like a rebuild, syncro or?
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    • Joe C.
      Expired
      • September 1, 1999
      • 4601
      #2
      Re: C3 Muncie Clunking

      It sounds like you have a worn 3rd gear synchro and/or synchronizer collar(hub).

      Joe
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        • Frank K.
          Expired
          • May 1, 2004
          • 0
          #3
          Re: C3 Muncie Clunking

          Joe, i am quite mechanical but have never torn into a trans. Is this worth fixing by itself or should i have the whole trans rebuilt. Would it cause more damage if i waited to fix it.
          Thanks Frank
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            • Jim T.
              Expired
              • March 1, 1993
              • 5351
              #4
              Re: C3 Muncie Clunking

              Frank there is a article with pictures on how to rebuild the 63-79 Muncie in the May 2006 issue of Corvette Enthusiast you might look at to see if you want to try fixing it yourself.
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