I pulled my axle shafts to replace them with alloy shafts, and they were a failure waiting for the inappropriate time. Driver shaft was bent, yes, bent, and the splines twisted; Pass. shaft OK, but the bearing started dropping rollers as soon as it cleared the race. I replaced the shafts a week before going to Moab... In Moab on the Tip Over Challenge (Hell's Revenge), I blew a front driver U-joint bad enough to take out a shaft ear (made the obstacle!!). 2.5 banger, 4.88 gears, locker in back, TruTrac in front, and 33" tires.