My 94 z-71 Just rolled over to 200k and the only problem the rear-end (G-80) gave me was when I took the truck to the local shop and have them drain and chan ge the trannie and rearend fluids and the dumb arses didnt refill the rearend with the proper "anti-slip" oil ... It started "chirping" on curves, so I drained it, pulled the housing cover, inspected (no metal in oil or drain plug magnet), put it back together and refilled with the proper fluid.
If you are gonna tow I would try to get 3:73s ... or at least 3:43s ... you can tell what gearing is probably in it by the GVW .... it shoots up about 4,000 pounds with the 3:73!
The only time I have heard of a adult driven (no racers!) limited-slip going south is when a guy hit black ice and didnt back off the pedal ... as soon as he hit solid pavement it snapped.
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