[saskgreen]

Actually the 3 speed runs and shifts just fine. I am switching it out because I am putting a 350 in it that will be pushing 375-400 horse, and wanted a tranny that will take it. I have heard nothing but good things about the muncie. But this is good news, perhaps at one point in the trucks life the original 3 speed failed and they put a different one in, who really knows lol.

Is there any numbers on the bell housing that I could look for that would indicate the earlier bell housing?

I had a someone drive the truck who has had many of these old trucks, and he said it shifts like a dream haha worse comes to worse I will have to switch out the bell housing I guess.