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Originally Posted by firemedicdave
the root cause the first time was the fluid started leaking out the gears overheated and failed. the new gears i have right now i just got yesterday and have not started towing, how many miles should i wait before i tow again? according to the shop onvoice the fluid they used with the new gears is 80-90w.
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Putting used gears in your diff without properly setting them up could cause problems also installing new gears and not breaking them in first before towing could cause problems and early failure.
Was the correct fluid used? I agree with this statement as your reason for the second failure....
the most important thing to remember with the diff is remove the cover and remove the metal debris....also replacing the diff fluid and inspection of gears is needed more often when towing high loads....
if your load is 6000lbs don't forget that the capacity is also including the vehicle with the added load that was added to it also...
with the diff you have now 80-90wt is the oil to use and no additives...i would run vehicle 2000mi open diff inspect gears for proper teeth meshing and debris if it looks good start towing...
make sure the diff vent line is not restricted this can blow out the seals especially towing high loads hot weather as this oil expands alot with heat...make sure the magnet is mounted on the diff cover if missing get new cover with magnet..