You shouldn't have to worry about the rear radius arms with a 2" lift. I've had no trouble with Mine. I did mod the front axel as discribed on a thread on Mu club to counter the lift effects on steering at the front and having bent 4 front arms my fronts are now reinforced with lengths of angle 'iron'. so far with no ill effects. I'd leave the rears if it was me. You may have to look at modding the bottom shock mounts, I run pro-comps up-side down and it seems to work as they are gas filled. Run them the right way up and they catch on the spring mounts.