Hi my 04 jeep grand cherokee v8 ho has thsi moaning noise on 2004 Jeep Grand Cherokee

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Cant tell where it comes from i just changed the back wheel bearing and noe i hear this moaning noise when i go 30 mph or more i put 75/ 90 gear oil i also have a sign of the pinion seal leaking on the front do you think it might be that.. How can i tell what the problem is
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Did you go to the dealer and get the CORRECT friction modifier for the rear diff(and the right amount)?