I installed my PoweTrax No-Slip auto locker in the the rear of my 00 XJ with the 8.25. I'm running a 3.5" RE superflex with 31" BFG MT's.
All I can say is WOW. The locker makes the Jeep a totally different animal. I was able to climb a 4ft vertical wall. Yes, My breakover wasn't good enough and I pivoted on my t-case x-member, but the ol XJ pulled through.
Installation was simple, except for the thrust washers. Dealer told me to re-install, instructions did not specify. PowerTrax said do not re-install. Cost is substantial compared to the LockRight, but on the street I can barely notice it, and off road it it amazing.
Carl