Avoid it, It is Junk ! I sold a few when I worked for 4wheelparts over the years . None of the customers were happy with them after they were installed. If you want coils get a TJ, Or Look into the Genright or RockKrawler kits
From what I understand about the Procomp kit, it is a bolt on kit and that sacrifices some flex since the coil buckets are not perfectly positioned along the frame rails. Ive heard it rides really nice, but you dont gain much flex over yj leaf springs, in fact most people lost flex. I believe warn makes a good coil conversion kit, the largest difference being that it has to be welded to the frame rails and is not just bolt on. This allows for much more precise positioning of coil buckets and control arms to reduce binding. I hear that the ProComp kit has the potential for good flex but due to the design, binds much more than it should.
Looks like the warn conversion I was thinking of is know under the name Black Diamond
To my knowledge, ProComp is the only company that makes a coil conversion. Most kits are coilover kits. If i was going to redo all my suspension, I would only want to do it once and I think coilovers are the way to go.
My friends got this kit about two years ago and are quite happy... they won several offroad competitions with it. So what's wrong with it?
It binds due to poor geometry, coils have poor spring rates, Not very many kits were sold, you loose articulation over a decent leaf spring setup. Overpriced. Coilovers and a 3 link/ 4 link rear is a better option.
The Black Diamond kits were actually very good kits. I have a few freinds that ran them and they preform as good if not better than TJs.
They are weld on. Really not sure if you can still buy them or not. http://www.superlift.com/suspension/jeep/BD-XCL.asp
The Pro Comp kit that you are asking about is a bolt on kit.
I have only known one person that had it and he ditched it for a SOA.
Part of the problem with it besides lack of articulation was the fact that if you wanted to go to bigger axles it was useless.
93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org