Dealer just replaced mine last week for the same thing. However, the idler pulley also has a slight "wobble" while running. I think that made mine squeal.. They told me that was not the problem. The belt was glazed. Still under warranty for 34k more milesMy truck started squeaking bad this weekend. Only occurs at cold idle, maybe even in mid range temps. Is there a TSB out on this? Need a new belt or what?