Join Date: Sep 2005
Location: Geismar, LA, USA
Re: 01' rear end questions...
A GT (V8) 8.8 rear end should bolt right up. I'd strongly recommend just switching to that instead of investing more money in a 7.5" axle. Find a junkyard where you can pull your own parts and grab the whole axle. Look for one with a limited slip differential (LSD) and you'll be good to go. Crack open the cover before you buy. As long as the fluid isn't milky and the teeth on the ring gear (the big one) look okay, roll with it.
The axles are worth $900+ if you go to a Mustang shop or a junkyard where they pull the equipment for you, but down here, the entire axle, with brakes and everything, can be had for $200 out the door.