General Motors transmissions
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Muncie 4 speed N | Muncie 4 speed N | ||
| + | '''M-20''' | ||
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| + | M-20 Wide Ratio | ||
| + | Cluster gear teeth: 25-22-19-17 | ||
| + | Input shaft/gear teeth: 21 | ||
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| + | '''M-21''' | ||
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| + | M-21 & M-22 Close-Ratio Cluster Gear teeth: 27-22-19-17 | ||
| + | Input shaft/gear teeth: 26 | ||
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| + | '''M-22''' | ||
M-22 “Rock Crusher” Identification | M-22 “Rock Crusher” Identification | ||
The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. | The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. | ||
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| + | (PICTURE) | ||
The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it. | The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it. | ||
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All other components interchange, with the exception of production upgrades and changes. For example, 1963-65 synchronizers, blocking rings, etc. do not interchange with 1966 and newer versions, and therefore the transmission must be stock or interchanged as a unit. | All other components interchange, with the exception of production upgrades and changes. For example, 1963-65 synchronizers, blocking rings, etc. do not interchange with 1966 and newer versions, and therefore the transmission must be stock or interchanged as a unit. | ||
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