Yokes are not perfectly balanced.
Ever change the front one 180?
They should always be put back in the same orientation when ujoints are changed.
Seems like not many people know that.
I had a nasty vibration in the driveline, and one day just for the heck of it I pulled the driveline and swapped the front yoke 180 and the vibration was really close to gone.
The reason I swapped it was because the ujoints were new when I got the car, and I suspected the driveline may not have been assembled correctly.
Turned out I was right.
