8.75 Diff Questions 2nd try

Swing the car from side to side when it's making the noise. When you put more weight on the rear axle bearings the noise should lessen. Less weight and the noise should get louder. That will determine if it's an axle bearing and which side it's on. If it's pinion or carrier bearings the noise shouldn't change. Pinion bearings will generally change tone if you accel/deccel or feather the throttle. Carrier bearings generally stay pretty constant and only change tone with road speed.