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Thread: Muncie 4 Speed
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Old 06-29-2012, 10:57 AM
AutoGear AutoGear is offline
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M21's are hard to sell unless its for a resto job. The M20 will work better with more highway friendly axles like 3.73s 3.42s and 3.31; and the M20 shares the same 1st, 2nd, 3rd gears and reverse geartrain. The difference is in the cluster and input (maindrive) of the 20/21.

The M22 does NOT have spur gears, however the only common gears it shares with the 20/21 family is the mainshaft reverse gear and the splined idler gear. All the other gears are M22 specific

Things buyers want to know:
Input Splines / Output Splines?
damage to case?
new wear parts?
7/8" or 1" countershaft?
Gear Ratios?
Whats it work best with?

If I had a non-numbers matching M21; I would rebuild it as an M20 because it fits a wider range of cars and its probably easier to sell
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