I have 18x8.5 wheels on it now. Get a lot of tire spin. Are 18x10's possible on the rear without rubbing? I'm running bf goodies 255/35/18 and spin them ****s into 3rd gear. If not maybe 9.5's? Just what them for the rear. I can get the same wheels I have now in a 10" wide

 

10" wide wheels will fit fine, as long as the offset is in the range of 45 - 55mm. You can actually go to 11" wide, with an offset of 45 - 50mm. That would require hammering the inner fenders, cutting the projecting edge off the jounce bumpers, etc.

Your 255/35-18 tire (25.0") is too small outer diameter compared to the stock tires (25.7" or 26.1"). You are going to want a 285/35-18 (25.9") on the wider wheels.

 

Thanks