I ended up using 255/45/18s which should have been the same size as my old 255/60/15. They rubbed some on one side but I did not trim the lip around my quarter when it was installed. But, they did not rub after a little work with a grinder. I think im going to buy a relocation kit next winter. I already have a b body rear to swap in. I just need to burn these tires off this summer! :-) I'd love to run a 295 or a 305 sometime.