Please don't waste your money on this kit. First of all the "kit" won't ship as a kit. I got the parts delivered to my house over a 3 week period and in 4 different box's. 3 of the parts were not the right parts for my jeep and the company only agreed to take them back after I got my credit card company involved!
Glen, the owner was nasty to deal with and only gave vague answers when I asked him technical questions. Stick with a respectable company that sells complete kits that you've heard of. Because I have an unlimited, RR sent me rear spring spacers and 2" lift springs. I went to 2 different shops in my area and both of them laughed at the set up. The rear spring spacers that Rocky-Road sent were actually designed to be front spring spacers. RR claims that front spring spacers, notched for the front spring bucket and too narrow to provide safe support of the wider rear springs, "will work". Getting by with some "will work" rig job is not what I planned to do. I ended up substituting 4" ProComp rear springs and track bars to get the job done right.