right now i have a 12 " wide trackstar wheel on the rear i cut the moser dana 60 down 1 1/2 inch on each side i think if i remember right it has a 5 " back space now !! years ago u could buy the cenerline autodrag with a 7 1/4 back space with 12" wide wheel on a stock houseing width !!!! my frt wheels are a nother story i BROKE 3 sets of ft wheels ? put my old alumistars back on the frt i BROKE the frt track stars , i BROKE the 1 piece billet trackstars and i BROKE a set of the rt-s wheels weld told me i can't break !!!!!!!