TRANSMISSION IDENTIFICATION The transmission identification code will differ depending the type of transmission - Manual or Powerglide. The manual and Powerglide transmissions will have a production code consisting of a prefix letter designating the assembly plant, a production date (month number/day number) and possibly a shift code for day or night shift if the assembly plant was using two shifts. | Manual and Powerglide Transmission Designations | | 3-speed | 4-speed | Powerglide | S - Saginaw (3-speed w/overdrive)
M - Muncie
K - McKinnon Industries
H - Muncie (H.D.)
W - Warner Gear | K - McKinnon Industries
R - Saginaw #
P - Muncie | C - Cleveland
*T - Toledo
E - McKinnon Industries | Muncie 4-speed
The first four digits of a Muncie 4-speed are the month/day; example P0310 is March 10.
# There is strong evidence the Saginaw M20 wide ratio transmission did not appear before February/March of 1966, so all M20 4-speeds are assumed to be Muncie before this date. If anyone as documented proof, such as a warranty card (Protect-O-Plate) showing a Saginaw coded M20 (R) prior to February/March of 1966 is encouraged to send a readable image of the warranty card for verification. | | Month Number | | 08 - August | 09 - September | 10 - October | | *11 - November | 12 - December | 01 - January | | 02 - February | 03 - March | 04 - April | | 05 - May | 06 - June | 07 - July | | | | | Day Number
01...31 | | | Powerglide Transmission
Normal code would be the plant letter, model year, month/day, shift (Day or Night) such as T1109D for Toledo, November 9, day shift. |
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