iheard a banging noise from the rear differential,brought it to atlantic chevrolet where i purchased it.its a 2011 chevy tahoe they told me first it needs a transmission that would cost 5200 dollars,then they told me the rear differential has to come apart.after a week they said it would cost 3700 dollars.it took 2 weeks and i had to rent a car for 1 week before they gave me a loaner car. i told them then the traction light comes on and it says service stabilatrack.well the lights comes on form time to time.was told by atlantic chevy to send bills in for a reimbursement because there is no warranty left.it was a certified preowned.sent in for a reimbrsement but never heard anything.