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70 GTO
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Pontiac MuscleCars - Pontiac GTO Transmissions

1. Source Serial Number Code (Automatic & Manual)

  • These codes were stamped on the left side near the top forward of the housing. Manual transmissions were stamped on the case. From 1964-66 transmissions carried a source serial number, which consisted of a plant prefix letter, a production date and a day/night shift suffix. Example: R520N=Muncie,4 Speed built on May 20 during the night shift. In 1967 the serial number was changed, it consisted of a plant prefix letter, year number, and month produced (with a letter code instead of a number).
    A-January B-February C-March
    D-April E-May H-June
    K-July M-August P-September
    R-October S-November T-December

    Example: N7C18=Muncie,4 Speed built on March 18.
  • Some late model 1967 and beginning in 1968, the car's last eight numbers of the VIN were stamped on the transmission. There are exceptions to the rule.
    Source Serial Number Code/Plant Prefix Letters
    Prefix Plant Transmission Type
    A Cleveland Manual Powerglide
    B Cleveland Turbo Hydra-Matic
    C Cleveland Powerglide
    CA Hydro-Matic Turbo Hydra-Matic
    D Saginaw Overdrive
    E McKinnon Powerglide
    H Muncie 3 Speed
    K McKinnon 3 Speed
    L GM of Canada Turbo Hydra-Matic
    M Muncie 3 Speed & Overdrive
    N Muncie 4 Speed
    O Saginaw Overdrive
    P Warner Gear 3 & 4 Speed
    P Muncie 4 Speed
    R Muncie 4 Speed
    R Saginaw 4 Speed
    S Muncie 3 Speed
    S Saginaw 3 Speed
    T Toledo Powerglide
    X Cleveland Turbo Hydra-Matic
    Y Toledo Turbo Hydra-Matic


  • 2. Model Identification Code (Automatic)

  • These codes were stamped on a metal tag located on the right side of the transmission. Exceptions are 1965, they were stamped them either on a metal tag or the low servo cover and in 1966 they were stamped on the low servo cover.
    1964
  • 64=Model Year
  • 30=V8 Engine Application
  • 135=Built on the 135th day of the Year

    1965
  • 65=Model Year
  • 40=GTO Application
  • 135=Built on the 135th day of the Year

    1966
  • 66=Model Year
  • NA=GTO Application
  • 135=Built on the 135th day of the Year

    1967
  • 67=Model Year
  • PT=400,2 barrel, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PT=400,2 barrel
  • PS=400,4 barrel
  • PQ=400,High Output/Ram Air
  • PX=400,High Output/Ram Air



  • 1968
  • 68=Model Year
  • PT=400,2 barrel, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PT=400,2 barrel
  • PQ=400,Ram Air
  • PX=400,All non-Ram Air/non-2 barrel

    1969
  • 69=Model Year
  • PQ=400,Ram Air IV, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PT=400,2 barrel
  • PQ=400,Ram Air IV
  • PX=400,All non-Ram Air/non-2 barrel

    1970
  • 70=Model Year
  • PD=400,Ram Air III,Ram Air IV, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PD=400,Ram Air III,Ram Air IV
  • PQ=400
  • PR=455


  • 1971
  • 71=Model Year
  • PY=400,4 barrel, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PQ=455,High Output
  • PR=455,4 barrel
  • PT=400,2 barrel
  • PW=455,4 barrel
  • PX=400,4 barrel
  • PY=400,4 barrel

    1972
  • 72=Model Year
  • PG=400,4 barrel, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PG=400,4 barrel
  • PQ=455,High Output
  • PR=455,4 barrel
  • PT=400,2 barrel

    1973
  • 73=Model Year
  • PT=400, Application
  • 1234=Transmission Serial Number
    Application Codes
  • PT=400,4 barrel
  • PQ=455,High Output
  • PR=455,4 barrel

    1974
  • 74=Model Year
  • ME=350, Application
  • 1234=Transmission Serial Number
    Application Codes
  • ME=350,2 & 4 barrel
    • D & L Transmission**For more information on all types of Parts and Service for Classic and Current Musclecar Manual Transmissions check out this site. Look up part numbers also.

    Pontiac GTO/GT-37 Illustrated Identification Guide!
    Pontiac GTO/GT-37 Illustrated Identification Guide!


    Pontiac Magazines:
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  • Pontiac Enthusiast Magazine - GTO, SD Catalina, Trans Am and Grand Prix GTP.

    Pontiac Resources:
  • Classical Pontiac - Chat, Classifieds, Clubs, Events, Features, Links...
  • GTO Association Of America - Mission is to preserve and promote the Pontiac GTO.
  • The New GeeTO Tiger - Check out The Jim Wangers Collection.
  • Pete McCarthy - The Pontiac Bible.
  • Pontiac Historic Services - Pontiac VIN number information.
  • Pontiac Mall - Look for Pontiac Apparel!



  • GTO VIN 64   GTO VIN 65   GTO VIN 66   GTO VIN 67
    GTO VIN 70   GTO VIN 71   GTO VIN 72   GTO VIN 73  
    GTO VIN 68   GTO VIN 69
    GTO VIN 74   GTO VIN 04-06

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