Muncie Four-Speed Transmission Assembly Code , 1973 Corvettes - NCRS Discussion Boards

Muncie Four-Speed Transmission Assembly Code , 1973 Corvettes

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  • George H.
    Very Frequent User
    • March 9, 2017
    • 180

    Muncie Four-Speed Transmission Assembly Code , 1973 Corvettes

    1973-1974 3rd
  • Mark E.
    Extremely Frequent Poster
    • April 1, 1993
    • 4498

    #2
    Re: Muncie Four-Speed Transmission Assembly Code , 1973 Corvettes

    M20 = wide ratio
    M21 = close ratio

    So "close ratio" by inference references M21.
    Mark Edmondson
    Dallas, Texas
    Texas Chapter

    1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
    1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

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    • George H.
      Very Frequent User
      • March 9, 2017
      • 180

      #3
      Re: Muncie Four-Speed Transmission Assembly Code , 1973 Corvettes

      The answer is Yes for Muncie M21 model year 73/74. The Muncie M20 model, part number 6271516, is a wide rage transmission with a 2:52:1 first gear ratio. The M21 model, part number 6271518, has a 2:20:1 first gear. In late 1974 only, the Borg Warner M21 started to appear in Corvettes with 4-speeds and was part number 361658. It had a 2:43.1 first gear ratio and it too is considered a close-ratio transmission. The B/W M20, part No. 346359/361657, had a wide range 2:64:1 first gear.

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