Ace,
TJRon is correct. If you have the RE4.5 there is really no need to get adjustable rear lowers. They will more than likely be stronger as they do not have the all-thread. Adjusting your pinion angle from the adjustable uppers is all you need to go up or down.
If you don't have adjustable uppers, I personally would still do it the same way and get the uppers.
Jim B.
97TJ El Niño, Mods listed on Web Site.
JJB@worldoversea.com
http://www.jeep.worldoversea.com
Jeep Rater Score: 42