I found the problem.
Taking a bump in the road with throttle on the floor...
The driveshafts started vibrating verymuch...
It seems as if the xtra lowering with the bonrat-things is 2 much...
I'm gonna remove the bonrath-things now and lets hope that solves the problem....
Now my question is:
How do you guys do that with lowering 60mm :?:
Do you replace the driveshafts with shorter ones :?: