Just from my reading as I haven't done it yet, many who have done it say that lifting closer to 3", driveline noise, and boot wear start to accelerate. The diff drop can reduce the angle at the cv by a few degrees, not much for sure, but enough that the driveline noise will diminish. The problem with the diff drop is that the level angle of the diff fluid changes as well, and apparently can prematurely wear the input gear (correct?). Differing consensus as to whether that is worth it. I'll probably do it on my setup as it comes with the kit. Stage 2 would be the rcv axle upgrade and long travel, which should solve all of that trouble.