C3 - Trans Number - NCRS Discussion Boards

C3 - Trans Number

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  • Greg F.
    Expired
    • February 21, 2007
    • 253

    C3 - Trans Number

    Can anyone tell me the 7 digit GM ID number for a 71 350/270 transmission, please. Greatly appreciated and thanks!
  • Jim T.
    Expired
    • March 1, 1993
    • 5351

    #2
    Re: C3 - Trans Number

    Starts with a P that represents Muncie. If it has the suffix letter A in the sequence it identifies the M20 wide ratio, suffix letter B is the M21 close ratio, and suffix letter C is the M22 close ratio "rock crusher".

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    • Warren F.
      Expired
      • December 1, 1987
      • 1516

      #3
      Re: C3 - Trans Number

      Greg,

      There are actually 3 different casting numbers used on the Muncie manual transmissions. Since you own a '71 ZQ3 car I going to assume you have a M20 wide ratio 4spd transmission. The numbers you are looking for are maincase 3925661, extension housing 3978764, & sidecover 3952648.

      To identify if this transmission was assembled for use in a 1971 model Corvette, you need to decipher the assembly stamping. An example for '71 model year would look something like this... P10321A

      Comment

      • Greg F.
        Expired
        • February 21, 2007
        • 253

        #4
        Re: C3 - Trans Number-Thanks, that's what I needed *NM*

        Comment

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