I heard this noise the other day on the highway....its like a whine/ with mild grind almost like something is rubbing against a rotating part.

It gets noticably louder when I take my foot off the gas. And applying the brakes doesnt change/affect the noise at all.

And it also gets louder when I take a right turn.

Its sounds like its coming from the right rear but I cant be sure.

And it only makes this noise when I'm drving. I can park it and pop the hood and hit the throttle and I hear nothing strange at all.

I thought it was my axle bearings. I've had a leaky axle seal for a while. I replaced bearings and seals yesterday and noticed also that there was only about 1 pint of gear oil in my case and I blew a side gear shim in my diff. So I replaced the shim also and put it all back together just fine.

Everything I did to the rear yesterday did not effect this noise at all. Same quality and same frequency.

This doesnt feel like a brake issue (no other brake problems). I need to put it on blocks and put the car in drive I think to see if anything is rubbing the driveshaft.....I dont know. I'm at a loss.

Anyone have suggestions?

 

worn crown and pinion maybe? or just not aligned properly.

Does it make the same noise under light acceleration?

 

Not really.....its the same quality of noise but very faint with acceleration.

 

Sounds like wear on the Decel side of the ring and pinion. An axle bearing would make the noise all the time.