Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Not necessarily. However, since your bearings are good I would also suspect the limited slip clutch packs. They tend to go bad within 100-150k miles, sometimes even less if wrong type of gear oil was used. If they are bad, you need to replace the packs to make the grinding go away. Use spicer replacement parts.
I'd strongly suggest using the Mopar limited slip friction modifier whenever changing gear fluid in the rear. That is, if you have a limited slip rear.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***