buddry said:
How do you figure what size rear end is in a 1986 Mustang? I need 3:27. I don't know if it a 6.75, or 7.5, or 8.8.
If the '86 was originally a V8 model, it had an 8.8" rear as original equipment. If it wasn't originially a V8 it had a 7.5" rear. But that doesn't mean the rear is original.
The differential housing for each rear is unique. The easiest way to figure out which one you're looking at is by the shape of the differential housing's cover.
A 7.5" rear's differential cover has TWO FLAT SIDES and TWO CURVED SIDES. Here is a gasket:
An 8.8" rear's differential cover has FOUR FLAT SIDES. Hear is a gasket: