1973 Camaro M21 Countershaft Size

Discussion in '1970 - 1973 Specific' started by Fume, Oct 12, 2020.

  1. Fume

    Fume New Member

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    Hey Everyone!
    I am currently overhauling my M21 transmission, was looking for a rebuild kit. There are 2 counter shaft sizes. There is a 1" and a 7/8". What is the countershaft size for the transmission? o_O


    Transmission for a 1973 Z28 NO A/C So its a close ratio M21
     
  2. McCune

    McCune Veteran Member

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    1"
     
  3. Fume

    Fume New Member

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    Why was there a 7/8"?
     
  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    7/8 was the size up to I think 1967.
     

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