General Motors transmissions
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Note 2: M-20 gear ratio: 1st 2.52:1, 2nd 1.88:1, 3rd 1.46:1, 4th direct, Rev 2.59:1. | Note 2: M-20 gear ratio: 1st 2.52:1, 2nd 1.88:1, 3rd 1.46:1, 4th direct, Rev 2.59:1. | ||
Note 3: M-21/22 gear ratio: 1st 2.20:1, 2nd 1.64:1, 3rd 1.28:1, 4th direct, Rev 2.27:1 | Note 3: M-21/22 gear ratio: 1st 2.20:1, 2nd 1.64:1, 3rd 1.28:1, 4th direct, Rev 2.27:1 | ||
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Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The additional letter codes as follows: | Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The additional letter codes as follows: | ||
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| − | Plant Codes and Prefixes: | + | |
| − | Plant Type Prefix | + | Muncie 3 speed Manual Muncie 4 speed manual transmissions |
| − | Cleveland Manual Powerglide A Saginaw overdrive | + | |
| − | Cleveland Turbo Hydramatic B Warner Gear | + | |
| − | Cleveland Powerglide | + | Suffix 1st gear ratio Suffix 1st gear ratio |
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| − | Saginaw Overdrive | + | |
| − | McKinnon Powerglide | + | A 3.03:1 A 2.52:1 wide range |
| − | Muncie 3 speed H Saginaw 3 speed S | + | B 2.42:1 B 2.20:1 close range |
| − | McKinnon 3 speed | + | C 2.20:1 Rock Crusher |
| − | GM of Canada Turbo Hydramatic L Cleveland | + | |
| − | Muncie 3 speed and Overdrive M Toledo Turbo Hydramatic | + | |
| − | Muncie 4 speed | + | '''Plant Codes and Prefixes:''' |
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| + | Plant Type Prefix Plant Type Prefix | ||
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| + | Cleveland Manual Powerglide A Saginaw overdrive O | ||
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| + | Cleveland Turbo Hydramatic B Warner Gear 3 & 4 speed P | ||
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| + | Cleveland Powerglide C Muncie 4 speed P | ||
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| + | Turbo Hydramatic CA Muncie 4 speed R | ||
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| + | Saginaw Overdrive D Saginaw 4 speed R | ||
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| + | McKinnon Powerglide E Muncie 3 speed S | ||
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| + | Muncie 3 speed H Saginaw 3 speed S | ||
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| + | McKinnon 3 speed K Toledo Powerglide T | ||
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| + | GM of Canada Turbo Hydramatic L Cleveland Turbo Hydramatic X | ||
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| + | Muncie 3 speed and Overdrive M Toledo Turbo Hydramatic Y | ||
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| + | Muncie 4 speed N | ||
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'''M-20''' | '''M-20''' | ||
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