Like the title of the thread says, I'm am getting a solid clunk noise (one I can feel through the vehicle) when I shift the automatic into reverse. It usually doesn't do this when shifting from park to reverse, but it does do it when shifting from drive to reverse. Is this a cause for worry or is it normal? Is there anything I can or should do maintence wise? I'm prepping the vehicle to sell it and don't want this noise to be an issue of concern for a prospective buyer.