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

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

Asked by for the 2004 Jeep Grand Cherokee
Did you go to the dealer and get the CORRECT friction modifier for the rear diff(and the right amount)?
No all i did was put a new wheel nearing and put the gear oil in it