Our 05 GC has made an annoying "whine" intermittantly when making left turns. Originally thought it was tire problems. Went through quite a few tires (Discount Tires Arizona brand). Don't buy these tires! We had multiple problems, with excessive tread wear, and causing the front end to vibrate. Had enough, and upgraded to michelin's.

I finally found that the passenger rear hub was causing the whine. $165.00 at autozone. Takes about 20-30 min to pull the old hub out, and put in the new one.