300; transmission clunk; zf 8 speed

It is a '16, with 21K miles on it. It's a bit of a 'stripper' (for a 300) but I like it alot. The driving experience is great; and it is very comfortable. I do have one concern that I didn't notice until driving to church today. The car seems to 'clunk' a bit from the rear just as I stop at a...