What is this noise?

[aryork]

2000 5.0 V8, AWD, 132k miles. Started suddenly the other day. Coming from the rear only when turning somewhat sharply and accelerating.

 

[Turdle]

I'm guessing the differential clutches need servicing.

 

[aryork]

I'm guessing the differential clutches need servicing.

Thank you! I did a little searching and believe you are right. I have a slow drip from the differential, so this all seems to be related. I had been putting off changing the oil, but will do that this weekend and add a friction modifier which some folks also recommended. I have no experience with differentials, so I did not even know there are clutches in there!

 

[aryork]

I replaced the differential fluid, including the additive and in a few miles of driving the noise is still there. I'll drive it a bit more and see if I get lucky.