The Chevy Dealer said it was the center support bearing. It can be greased or replaced. To replace it is at $800. I chose to have it greased. They said it could last 1 day or several years. However, they did not grease, they used oil. I have a personal mechanic that inserted grease with a small tool. The whining has stopped.
I believe I will continue to have it greased.
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Tuesday, May 5th, 2009 AT 7:51 AM