I ran 32s (265/75-16) on my stock wheels with 5.5 backspacing with no rubbing at all and no lift. When I went to Granite Alloy GA9 wheels with 4.78 backspacing they rubbed a lot on the bottom part of the front bumper cover and just barely touched a small area on the very inside of the lower corner plastic behind the front wheels, just where the mud flaps used to be. I trimmed the front just short of where the little metal brace attaches and cut off the small part behind the wheel and that was all that was needed, still with no lift. I think I might have pictures of that on my built thread if you want to have a look. Now that I have the RLC bumper of course there is no clearance issues at all on that end. One thing to keep in mind with a suspension lift is that unlike a body lift, if the suspension compresses all the way to the bump stops while turning the tire will be in the same place as before the lift. It will just be a lot harder to get the suspension to compress that far unless you remove the front sway bar. I plan to do a three inch suspension lift as well and will be going to 33s (285/75-16) when I do. One option if you do have any contact after the lift would be to install slightly bigger bump stops to limit the up travel. MechPatt587 just got some nice new 33s on his X with a suspension lift and at full lock they rub a little on the frame on stock wheels so I think he's looking to get some new wheels with around 4.5 to 4.75 backspacing soon.
