Mine made that clunk pretty bad, but I could feel it in the floor board. If you can feel it just under your feet check the bolts in the tranny mount. It turns out I had 1 very loose. I tightened it up and the clunk was gone.
I had an aluminum D/S and it clunked now I have a carbon fiber D/S and it clunks as well I don't think the clunk is the D/S itself unless it's the linkage ie u joints, yolk? Someone has to know definitively!!