I recently put on some 265/75/16 BFG AT/KO's on my non-lifted X.
http://www.utahoffroad.com/forum/forum_posts.asp?TID=374&PN=1&TPN=3 (Scroll down. Mine's the silver X).
I had rubbing on the front wheels but trimmed plastic in the front and solved that problem.
I still have some rubbing from the right rear wheel on the plastic thing that protects the hose going from the gas cap to the fuel tank. This rubbing only happens if I try to flex over large obstacles.
I will install the Calmini shackles and do a t-bar crank sometime this week to see if that solves the problem.
By the way, I have the Nismo wheels. I'm not sure of their backspacing.
I hope that helps you out.
John