fox body 8.8 in a body purists stay away lol

as they said above, its 1 -2 inches wider, depending on who you ask...lol. If the spline count isnt important to ya, the mustang rears are plenty strong for most applications. with the exception of the harder to find cobra rears, though, you have to adress the 4-lug situation. Swap in driver side axleshafts from bronco II or ranger, or passenger side aerostar axles. They have the 5-lug (bbp).