I recently installed a centerforce II in my 94 YJ. If you've never done any heavy duty mechanic'n before, I would recommend having it done somewhere that specializes in Jeep work. It took me a full day to complete the job with the help of a friend. If you do decide to tackle it, better bribe a friend with beer when it's time to slide the tranny back in place....definately easier with two people. Parts for everything (clutch pressure plate, clutch disk, throwout bearing, pilot bearing, having flywheel turned) was around $250.
94 YJ 4", SYE, 33 mud t's on MT classics; 4.10's with Detroit Truetrac in rear