Zemanek889

Hey guys looking for a Muncie M21 if anyone has got one please let me know. Thanks, Marty

jensenracing77

where are you located? it may help to find one closest to you. i have one that is completely disassembled that i may sell but i am not sure yet.

507OLDS

Are you looking for just any M21,or one that would be correct to your car? They changed casting numbers,and a few other things throughout the years,but the fit & function are pretty much the same.

Zemanek889

I'm located in central Illinois.. And yes I'm looking for one that with bolt up to my car. 1972 cutlass rocket 350

tecar442

Your car is a stick shift car, right? If you're converting from an auto you'll need to drill your crank for a pilot bearing.

jensenracing77

i know it is not an M-21 but i have an M-20 that was removed from a 72 cutlass with linkage and factory hurst shifter. it has a lever for a non console car. i am missing one rod for the reverse lock out. i have not opened the side cover up to look inside yet. i even have 4 speed cranks, flywheels, bellhousings, pedals... i am in Brazil IN so maybe not to far to drive?

Zemanek889

yes i will be converting from and auto and i am aware of drilling the crank for a pilot bearing..

507OLDS

All of the 72's came with the M20,which also have the 26-spline input,and the larger 32-spline output.Sounds like Eric has the perfect match.

bkeese

Years ago I got stuck helping a friend that had an olds auto engine in a Chevelle stick. The guy that did the swap didn't used a pilot bushing. What I did was turn down a pilot bushing on a lathe to fit the auto crank.

Just a thought.

507OLDS

It's not that simple.The input shaft of the manual transmission needs a hole deeper than the depth of the existing automatic hole,so you need to make a relief hole for the end of the input shaft to pass into.The adapter bushing also needs to be inset from the edge of crank.If it is flush with the end of the crank,it will not work,or be in a bind.The splined part of the input shaft actually starts to enter the crank.I think this is also why you see some manual transmission with the ears broke off.People think they can just keep tighetening the bolts to get the transmission to seat into the bellhousing.Nope.There is a reason why it is not going in,so don't force it.A home-made adpater bushing can be made,for those of you that have an engine that is assembled.It's only going to be about 3/8" long/deep,and you will need to drill a relief hole for a void,for the tip of the input shaft,but it will work.
Machining the crank would be the best option though.