hi guys ! i had a bit of a search, and couldn't find what i was after. so here goes. i have a 1977 f100 2wd. it has a t18 trans, 3.25:1 nine inch, and 31 inch tyres. this gives me about 2200 rpm at 65. the question i have is, the 4bt's i have been looking at have come out of vans. they have a th 400 attached. i would like to keep my t18. does anyone have a photo of the rear of these engines ? is the flywheel housing small block chevy ? would an sae 3 flywheel housing be hard to get ?