Bearing Noise
WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.
Bearing noise can be either a whining or a growling sound.
Pinion bearings have a constant high pitch noise, because it rotates at a faster rate. This noise changes with vehicle speed.
Differential bearings usually produce a low pitch noise. The differential bearing noise is constant and varies only with vehicle speed.