Nisaja

Is it shuddering when you're making slow turns? Try changing the diff fluid. That usually works.

phaeton217

No shuddering at all, and the rear diff fluid was changed 6000 miles ago. I tried slow/high speed turns at a large parking lot but still couldn't find the problem. However, I just found I can also hear the noise sometimes when driving straight on the highway, it seemed pretty random.
I don't know if it's related but my wheel studs were stripped last month. Car was towed to a local performance tuning shop. They changed the front/rear studs but for the rear they had their machine shop rebuilt my old hub with new bearing. Is it possible that the hub is getting loose?

Nisaja

I see. Unfortunately I have no experience on that man, sorry maybe another member could help.