I have been hearing this clunking sound for a few months-a year. The sound happens whenever I reverse and then move foward and is only one clunk per time. Also of course on a hill whenever I begin to roll backwards and go foward. When fiddling with the driveshaft the sound seems to be coming from where the rear differential and driveshaft meet. I’m not sure why I never worried about it when I first started hearing it, but it’s just annoying to hear it. Please share some insight on what it could be. I do not know how to attach a video of the sound.