Wow, thanks for all the quick replies. By the way, I have a 1995.5 Rodeo (should've stated that earlier, but I was in a hurry to get to work and it slipped my mind). The way I understood it, he was saying that the axle was aluminum, and, if pushed too hard, would warp causing the gears to be destroyed. I had never heard of this before, so it caught me by surprise. I'll definately be looking for another shop to do the install.

1995.5 Rodeo, V6, AT, SOA, SAS (almost finished, but it's driveable), 5.38's, Aussie locker in rear