The knuckles have to be changed, but everything else (minus t-case) will bolt right in.

I'll be giving my wife's X all my 4x4 parts when I go SAS, but that won't be until fall or next winter.

I think OnlyOneDR did some research on whether or not the rear extension housing on the transmission can be changed out (instead of getting an entirely different trans). I need to talk to him about that as well.