The Ford 8.8 is slightly narrower than the D35, measuring 59.75" WMS-WMS vs 61.25" for the D35-eqipped XJ (WMS is wheel-mounting surface). This means each side is going to be 3/4" narrower. While the narrower rear can mean tighter turns on trails, it also means the tires may make contact with the inner fenderwells unless you use spacers or rims with less
backspacing