From their website...
http://www.boulderbars.com/frankenlift_faq.htmQuote:
Also on tires: 245x75r16 tires fit the best out of all the sizes on a lifted KJ. And about 50% of those KJs NEED to pound out the pinch weld behind the front tires. It depends on your type of wheeling. It also depends on the actual tire diameter.
YES! You can run 265's on a KJ, but make sure whatever lift you pick is at the max height. Also plan on trimming about 50% of your inner front fender wells, the air dam, and the pinchweld behind the tires. This will leave the washer bottle exposed, so some undercoating or a sheet metal shield over it works okay. When we trim out the front, we undercoat the areas trimmed to preserve the life of the KJ. Removing the plastic inner fenders completely also works, but may not be enough protection in snow county, or where the roads are salted.
Once trick I did to help tire clearance a little when turning, is a large washer on each of the lower control arm bushings. They have a ~1" center hole, so they really only float in there and limit how much the bushing can travel/distort.