to convert to rear disk is actually pretty simple, there are a few companies that make brackets and with some GM calipers from a Cadillac and some 4 lug or 5 lug rotors, you can get rear disk brakes, alot of the jeep guys do this, and its cheap and works pretty damn good. But most guys do the axle swaps, use a proportioning valve and get a different master cylinder, cuz you will need one from a 4 wheel disk car, if not you have some fugged up spongy brakes to work with, which I would not invest 10 cents into. But yeah , 99% of all stangs other than those listed above came with drum brakes. And what is lsd????