I'm actually getting the RE 4.5" lift, and I have a 2" body lift, and I'm installing TJ flares on my YJ to clear 35's. There is a guy I run with that has a 4" sus. 1" body, and 1" shackles, and he said he rubs a little when he discos, and on full turns. He hasn't trimmed any fenders though, I would recommend trimming, even just a little.