Could i fit 35" tires with a 3" body lift on a 1998 silverado z71?
The torsion bars are already tweaked.

The tires: 295/75/16 Nitto Terra Grapplers.
The wheels: 15x10 rock krawler w/ 4" backspacing.
The lift: 3" performance accessories body lift

If they fit, I know i might have to do some trimming, but how much?
Would the backspacing from the wheels help at all?

That size tire isn't quite a 35, but I don't think they will fit on 10" wheels, without some trimming. Especially a 295/75/16 on a 15x10......

I am sorry, I was looking at my old tires which are 295/75/16 they are just about 33.5in, worn down to about 32.5in, and accidently typed 15 instead of 16 for the wheel.

The corrections:

The tires: 315/75/16 Nitto Terra Grapplers. Actual diameter 34.49in.
The wheels: 16x10 rock krawler w/ 4" backspacing.
The lift: 3" performance accessories body lift

There is a truck around here that has a 3" body lift running 35s. He is on 8" wheels tho. It doesn't rub inless his plow is on and up, then it rubs pretty good I guess. I think with the 10" wheels would really make it rub. Maybe if you give the very bottom of the fender a couple of love taps with a ford tool, it might not rub, or maybe a little but not enough to worry. Just bustin' yah on the rims......

im running 35 x 12.5 bfg m/ts on mine with NO lift and a little bumper cutting and fender smashing...

it dosent rub unless i try to flex it out...and its with 15x10 inch rims