I have had an L.A. Locker (that's what they were called when they first came out) in my D44 for about 16 years now. I run 35s with 4.09s and an NP435 and it's held up great. It has even survived a couple of broken axles with no ill effects......I've heard that the shock of an axle breaking can take out a Detroit! The strength limiting factor is the stock carrier as the locker parts themselves, are quite strong--------Hans