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GM Has a fix for the rear axle chatter
Document ID: 2672507
#PI0137B: Rear Axle Chatter Type Noise on Low Speed Turns
The condition may be caused by a slip/stick of the posi-traction clutch plates. As the plates slip and stick, a jumping or jerking feel occurs, accompanied by a chatter noise.
The fix is replacing the Synthetic Differential Lubricant (P/N 89021677) and adding a Lubricant additive (P/N 1052358). These are US only P/N.
It's covered under warranty and it worked for me.
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