Question about 2003 Jeep Liberty

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Increasingly loud noise coming from rear of '02 2WD 3.7L liberty

Truck has 138k miles. started noticing noise about 10k miles ago. my local mechanic checked it out. He checked out the rear wheel bearings and those were ok. said it was most likely the rear differential. Called local jeep parts guy and he said it was most likely the spider gear assembly. Is this the most likely cause? How easy/difficult is that replacement? Should anything else be replaced (gears,bolts,etc) while down there?

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Spider gears are not difficult to replace...however, if they are worn, usually this contaminates the lube and can cause damage to carrier as well as pinion bearings...Those require precise settings with special tools and lots of experience to replace. Since you have had the noise for a long time, I can safely assume that debris has been building all that time. Spider gear set is not cheap...You may want to risk doing the job, but I would likely find another exact match, drum to drum replacement in a scrapyard. Generally I will only recommend a spider gear replacement if you have snapped a gear in half...an immediate failure
does not generate the kind of fine metal that wear does.

Posted on Apr 17, 2009

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Yes , had a similar problem changed the rear diff. fluid with 80 90w oil with gl 5 in it and added k@w friction modifier additive noise went away they are limited slip rearends with 3:73 gears and the get a build up in rear end my liberty was a 2003 also . ps good luck mine has 128,000 miles also.

Posted on Aug 18, 2010

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