Clunk noise from drive shaft

I have this clunk noise from the driveshaft when going over speed bumps and clutch pushed in . It’s a 6spd manual .also I get a thud from the driveshaft when releasing the clutch and can be felt threw the cab especially going into 3rd. I do have appointment with the dealer to address the issue . Just wondering if anyone has had the same problem and had it fixed . Looking for advice on what to discuss with my service advisor for things to check .

 

U Joints, play in the rear end gears. guess they get it up on the rack and rotate the rear tire back and forth and try to isolate where it is coming from.
that's what i would do.

 

I am having the same problem with my 21 MT. Were you able to determine the cause and get it fixed?