I have not been able to get back to the dealer yet . i looked on my original GMAC finacing paper work, and the extended warranty was just listed as "preferred " witha cost of 1600.00. i assumed that it was a full 3 year extention of the factory warranty as that is what i requested. the trouble is that the salesman is in jail now and i might have a problem proving what was agreed to. the GTO is in it's stable now and i will visit dealer in the near future to talk to owner. the whine is just a slight wah at 50 mph. cannot hear ot at 70. when i hit the gas it is just a slight noise. the main problem is they wanted 97 bucks to tell me the warranty does not cover openning the diff and checking it out. so i just said give it back and they charged me 45. also on my checklist they recommended transmission flush,coolant flush , and some other item for a total of 600. when i went back the service lady was not there so i just picked it up and laid rubber out of their service drive. i am worried if i do the work somewhere else then the warranty i have could be voided. i still have 1 1/2 years warranty left and only 13,500 original miles. thanks for your advice.