Question about 1998 Jeep Cherokee

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98 jeep LSD Dana 35

Hi I was having diff noises so I have removed the diff centre and discoverd a worn left carrier bearing, ready to crumble at any time.
However I also discoved a shatterd plate on my clutch side of the diff the solid one.

Any ideas what causes this. Eg loading up the vehicle too much while pulling?

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Most differential failures are either caused by low fluid level (burnout),
"Shock loading", which can be caused by accelerating hard on an icy surface, sand, etc. then "hooking up" on a better surface while under power, or,just getting on it really hard in a forward gear after backing up without rolling a bit in drive to close the lash between the gears.
Material failure: In which case, a flaw in a casting allows normal stress to cause a failure without the operator doing anything unusual.
Your question about over-loading would not be valid in your case unless the overloading was coupled with one of the above. Generally, overloading will just cause the gears to overheat because the load will cause the lube to squeeze out from between the gear teeth and cause excessive friction generated heat. (why heavier lube is recommended for towing).
One recommendation though...once one diff bearing fails, replace them all. (rebuild the unit) Debris from one bearing is carried to all bearings and causes microscopic wear which will result in another failure.
Rebuilding is part technology and part "art-form" requiring experience and the proper tools. It is expensive. It may be better to find a replacement (wheel to wheel) in a scrapyard though if it's a posi, that may be difficult.

Posted on Jun 07, 2010


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