Well, I don't have the stock bumper, I have a custom made one that gives ALOT more clearence then the stock one. I want to stay away from cutting but hammering or bending might be ok on the back of the inside fender.  There Super Swamper TSL SSR's.

i Have a 2" suspension and 31 mtrs. all i needed was a little inspiration with a hammer on the inside of the fender wells (doesnt look bad at all) and a trim of the front bumper corner edge plastic. if you hit a bump just right it still rubs occasionaly (like if you are turining and going a little quick in the driveway) but besides that no prob. have a good one.

Heres another pic

Here is an interesting picture

in the front in this pic are 31"  Swamper LTB's   (2.75" backspace  15x8 rim)

and on the rear are Maxxis mudders   235x75  stock rim


this is with NO trimming, and 2" suspension lift (BDS)  NO body lift


The fronts would roll, but not turn, had to trim bumper and rear of front fender

With a 3" body lift, I would say just a corner or two and a little beat back and you will be fine.. choose your wheel and backspacing carefully... how wide are the SS's??