Defect:
Transmission (DSU) has a very unpleasant and unstable feel inside (probably the rivets), the drive was allegedly fixed to the inner joint.
I bought a transmission today for 400,- and the drive shaft is new. I will install it tomorrow. Ohjjeeeeee, I hate gearboxes
As the car was on stage, it was quite easy to rule out the engine. It's a shame that I don't have a stage :-/