8.8 swap
There are 8.8's out of Mustangs that will fit. They are within an inch or so. It turns out the same as the explorer swap but you dont have to cut them. The biggest hassle is the 4-bolt wheel pattern. This is easily solved buy simply replacing the axleshafts with 'short-side' explorer axlrshafts. Then voila! the bolt pattern is correct. The viable rearends to use were starting in 85 or 86 Mustangs, cant remember. I have NO idea at what year they got wider and would not work for us A-bodies. Likely the next big body design change.