I have a driveline vibration only in high gear at freeway speeds (55 on up). I haven't recently changed anything on the car. I pulled the driveshaft and took it to a shop. The shop said it was twisted and they had to cut it, re weld it, and balance. They also put in new spice yoke and u joints. The guy said it was violently out of of balance at low speed which I didnt understand if I had only noticed it at freeway speeds. Either way, the vibration is still there. I pulled the driveshaft out...
Driveline vibration
