It really depends on what type of trails you are running. I ran 4" wrangler rears up front, pretty flexy, with stock steering for a couple of years. You end up denting the shock and the up travel gets limited by the J arm. I didn't break the J arm but would have if I keep hammering it. I had to set bump stops and limit the travel on the springs to save the steering. Hy steer solved the problems. If you are running mild to medium difficulty trails you shouldn't have a problem, just carry an extra J arm.