Iv noticed this shaking/vibrating coming from the rear end of my car. Thought it was my tires went an made sure they were in good shape an balanced all good. Iv replaced both rear hub assembly,control arms, an sway bar links since the issue has started hoping the hub an had bad bushing on the sway bar so I replaced them. The noise doesn't start until I hit about 55-60 the vibrating starts an a slight hum/whine not to sure on what is causing the issues all the rest of the bushings an parts don't look bad at all.

 

Humming is usually a bad bearing or gears. Have you checked the diff fluid?

 

It's the rear differential the gears are so terrible gonna have to have it rebuilt sadly 😕

 

You can probably find a used one for cheap. I know theres a few in my area around LA.