This is weird, because I too have the same problem. I just busted the tranny case in my 75 F250 4x (the one in my sig), today and was fixing to research it.
So can anybody clarify what I might be able to use for a tranny? Do I need to look for a 2wd tranny and swap tailshaft assemblies or get a 4wd tranny and add my tailshaft assembly?
PS, Thanks Tex for bringing it up!