Muncie 4 speed....M21, M22, Rock Crusher? | The H.A.M.B.
Mar 30, 2009 · That's where the 'whine' come's from with those transmission's.. Also, there's companies out there that are making new gear set's for Muncie's as well..not just stock replacement stuff either. You can outfit an M20 or M21 with Rock Crusher type gears, OR actually make a 3 speed O/D out of a 4 speed case. Forth being the overdrive obviously..
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