This thread really has me examining my Trans. For 20 years I've just assumed I had a Muncie 4sp as my old Chilton book shows. Never knew there were so many Identifiers.

From all that I've read over the last 24 hours, you are correct in saying that only the Muncie had an Aluminium Casting.

I've run all the checks that are posted here and from other searches, and it apparently I do have a Muncie. I should find out next week what type it is, I'm having the trans looked at by a good guy that should be able to tell me. I think I have some synchro issues between 1st and 2nd gear.

Alum Cast 3885010
P7E19 date code
7 bolt cover
Reverse lever in Extension Housing


Just want to add how much fun I've had reading all the info on this site, amazing amount of good posts and info.