I had 35s on my CJ7 with a 4" superlift spring kit, a 1" longer than stock shackle, and a 1" body lift. They still rubbed a bit under hard flex. I did a front shackle reversal which moves the axle forward about 1.5" and that helped with the front rubbing, but didn't completely eliminate it. Rubicon express makes one of the best lift kits on the market now, very complete, but pricey at around $1000.
I finally went to a spring over on 2" lift YJ (Wrangler) springs, and added TJ flares. I now run 37s with no rub. At the same time, I added flat top knuckles from a Dana 44 and went to a "high steer" setup. The steering geometry is right without even a dropped pitman.
I might be able to dig up some pics if you want them.
www.mountainoffroad.com
www.rubiconexpress.com
Bob
tufcj