Go to lift forum and look at post "lifts".
I just installed the Rough Country on my 91 and will give it an A for ease of installation. My girlfriend and I did mine on a Sat. afternoon. I think it looks great and seems to have a decent ride. I guess one other good thing about it is the price. Tell him you were referred by Chris Kotke (me) and you can get it for $350 plus shipping. On the rough country website they are listing them for $389 and some idiots on Ebay are paying as much as $450 for their's. I ordered mine on a thursday and I got it Monday morning. Sorry for long reply. Hope this helps.
91 YJ, 4 banger, 3" Rough Country, 3" body lift, 31X10.5 BFG KO's on 15X10 bajas, K&N, restrictor removed.
o-I_ ___ _ I-o
(O IIIII O)
[_ O__O _ ]
94 YJ 4.0 HO 3sp Auto, 3" RC Lift, 1" Shackles, 3" BL, 31x10.50, Pacesetter Armor-Coated Header, Homemade Air Intake w/ K&N