Rubbing sound in right rear tire area

Have you tried to applied the brakes when you hear the noise, to rule out the pads, rotors and calipers. if that does not stop the sound, tire or possible the wheel bearing needs to be cleaned and lubed..

After changing differential fluid, it is IMPERATIVE that you do 8 to 10 slow figure eights in a large parking lot to circulate the fluid throughout the clutches in the differential. The fluid must also contain the proper amount of limited slip friction modifier. I suggest AC Delco LS gear oil 75W-90 because it contains the perfect blend of ingredients and you don't need to add anything. It worked for me perfectly! The cheapest place to get it is Amazon.com! If that doesn't work, it's definitely the wheel bearings, an easy fix as well! Good luck!

You may have a brake caliper hanging up, and at higher speeds the engine and wind noise overrides it. Pull off the rear tire and look down on the disc pads and see if they are wearing even. The front of the rotor will wear faster than the rear, and the middle may look fine. Feel the rotor, when cool of course so you don't burn you fingers, and see if there are grooves or uneven wear. Next would be to actually pull out the pads and look at them. This is at no cost unless you do find uneven wear and scored rotors. Put the car on a rack or jack up the car so the rear tires are off the ground. Block the front tires, put the transmission in neutral, take off the e-break and hand rotate the tires. If you jack it up, make sure you're on a level surface please. Spin the tires in the direction you drive going forward. Top towards the front of the car direction. Listen to see if you hear any "rubbing" noise. If you do, it is a wheel bearing. Have it replaced. The bearings are sealed, and putting lube on them is like pouring salt on a beer can to make it taste salty. Won't work. 40 or so years ago it would. Your yoke bearings also can be going out, so the "rubbing noise" could be coming from there also. The car is 12 years old, and parts do have a life to them so about now is when you will be putting more money into the car to keep it sound. Sop first check the pads, then turn the wheels and listen. While it is in the air, check to see if you can see any parts that are being worn by rubbing. Frame, inside of the fender wells, tires, rims, or anything that moves or rotates. The checking is free, the fix may cost a little now, but let go, will cause perhaps more damage which costs more money. Happy hunting. Let us know. If you go to a garage, make sure they show and explain what is wrong and why they know it is. Some people throw parts at a car, charge money and not fix what is wrong, or fix what does not need replaced. You drive a Corvette, not a Bentley.

Change the rear differential fluid with GM approved fluid with the correct slip additive. Then drive in Figure eights slowly in a large parking lot to properly disperse the fluid throughout the clutchpacks in the rear end.