I have a 2015 FWD and when I back down our sloped driveway, shift into drive and start driving, it sounds like I've crushed a tin can. It always happens when backing down my driveway, occasionally on level surfaces. It is not while shifting - it is after I begin to drive. I have had the transmission replaced twice, so it is not something within the transmission. It does not happen on a lift because it is level, so it is difficult to replicate the problem.