The numbers on this trans are as fallows:

Side cover 3884685
Patent 3088336
Side case 3885010
Tail stock 3846429
Underside P303303
Vertically on side case P0503

I believe this to be an M20, it came from a closed transmission shop and appears to have been rebuilt. All new seals and gaskets, removed the side cover and appears to have new synchronizers at the very least.

Help, I wish to sale the transmission and I need to verify what exactly it is. Any information would be helpful! Thanks a bunch

sorry to highjack but also if you guys know of any site can you please post it i would like to also look up and see what muncie i have.

http://www3.sympatico.ca/atkinsom/history.html

http://www.5speeds.com/muncie2.htm