In order to get my 35x12.5x15 to fit I have 3.5 suspension lift which consists of OME coils and 2" poly spacers and cranked up Sway-a-way 31.5mm torsion bars and a 3" body lift. I also had to cut the rear of the front fenders back about 2". I believe my backspacing on my rims is 4.25" You'll also have to limit your turning radius a bit because it will rub on the sway bars and bumper bracket.
Good luck
Gilbert

94 Trooper, 4 susp. lift, 3 body lift, 36" Swamper SX's , ARB lockers (front and rear),5.38 R&P's,Exo Cage, safari rack and ladder, snorkle, ARB bull bar w/ side bars,custom rear bumper, Warn 9000 lb winch and lots of other stuff.