I've got a front lockright, but haven;t played hard yet. I think the tierods should be the main concern. On high traction surfaces, the locked front forces the tires to tun inward. My trooper looks almost pigeon toed at times.

Also, I think the CVs are less likely to break on a locked vehicle. Every CV that i've seen blow out on an isuzu was related to spiing tire that finally caught soem traction. Others on the board will strong disagree with me on that one.

ANyway, the front lockright is a great upgrade, especially if you frequent loose or wet surface terrain.