Loud Thumping and Vibration above 65mph

[BoostedAWD91]

I have a loud thumping and vibration when i go 65mph and above. I think that it would be the driveshaft because i have had loose mounting bushing and a big thumping because of that but i fixed that and i now have it at higher speeds. Could a bad carrier bearing be the issue?

Another question is i installed at ACT2600 clutch with 5 puck race disc. I am not sure the clutch disc is engaging correctly because when i am leaving out the clutch the car begins to jerk and make a terrible thumping noise. I have been driving DSM's for the past 6 years and i never had this problem before, its just seems not to be engagin correctly. the flywheel was stepped at the correct height for the ACt clutches. Is there a fix?

 

[DSM90AWD]

I have a loud thumping and vibration when i go 65mph and above. I think that it would be the driveshaft because i have had loose mounting bushing and a big thumping because of that but i fixed that and i now have it at higher speeds. Could a bad carrier bearing be the issue?

Have you dissassembled your driveshaft? If so.. it is important to reassemble the sections in the correct orientation to one another as the unit is balanced as a whole.