Shaking Steering Wheel '87 85/4000Q

[datalapio at kolumbus.fi]

Hi,

the steering wheel of my 4K begins to wibrate on highway speeds (80 km/h - 50 mph).   

The higher the speed the worse the shaking. 

The tyres have been changed and balanced and the position of the wheels have been switched from back to front. Four wheel adjustment has just been made and the front brake pads have been changed without effect on the problem. No slack can be found from the joints. And the wheels roll without noise from bearings.

It seems that I have some slack in up-down direction of steering wheel mounting but I do not know if this have anythign to do with the shaking?


Does anybody any ideas what should be done next? Can it be faulty drive shaft joint or wheel bearing?

Br,
Tuomo