Kostyan

We are getting a barely heard "thud" noise from under the rear part of the car (differential?) when doing these steps.It does not come on every time but is getting me worried about bigger problems down the road. 2013 with 35k mi AWD. Has anyone experienced similar to their 3rd gens or may have an idea what it is?

1. Drive in reverse (back out of driveway for example)
2. Switch into D
3. Take off - the thus will be heard a few seconds after launching the vehicle in forward motion