I've fitted the uprated rear anti sway bar from addco (bought from US) to my WJ and first of all I have to say it totally changes the feel of the Jeep and has stopped most of the body roll, so brilliant upgrade and we'll worth the money.
I do have one issue with it though where the new bar is knocking against the lower suspension cup, and wondered if either anyone else has fitted the same bar and had that issue (and fixed it!), or if anyone can knows if there's a way of moving the bar so that it doesn't make contact with the body?
