The GT may or may not have a T-Lok, and even if it does, chances are the clutches would have to be replaced anyway.Dustang99 said:
-in 2001, the axles are 28 spline, the same ad the GT.
You need to be putting out a LOT of power before the rear end will give up. (Around 300+ for pre-01s, 375+ or 400+ with a girdle).
You can pick up a kit from stangparts.com, or just get the entire axle assembly from a salvage yard (axle, housing, shocks (including quads) hubs and discs. You may want to use new fasteners.