Rear end noise
The rubbing noise coming from the rearend of my 2005 Sierra has not stopped. It started after getting the brakes serviced. I was told it was the gear oil, it needed additive. It stopped for about a week. Then I changed the gear oil and put in synthetic. No change. I was told I had limited slip. Then I was told I had a locker. But the rubbing is loud enough to vibrate the truck. It happens when I turn at any speed. Not sure what to think or do at this point.