At approximately 8000 miles or so our 'new' 2007 Commander developed what sounded like a rear end whine. I Finally got it to the dealership and it was discovered it was in the front differential. Anyway, they replaced the parts and it is now gone. This seems to be a common complaint, just thought I would post an update. I've never had one with a front diff problem, usually from the back. Hope this helps someone.