Mercedes-Benz W639 driveshaft vibration
Is the driveshaft the cause when my W639 vibrates at a certain speed?
Often yes. The vibration usually appears between 70-110 km/h and goes away when you lift off the throttle. Typical causes are worn or seized driveshaft universal joints, the centre support bearing and the transmission support mount. Rule out wheel imbalance first.
What parts does a driveshaft vibration repair usually require?
Replacing only the universal joint is not always enough. Check the support bearings, the transmission support mount and the universal joints at the same time. If parts are worn or rusted, they are replaced and the driveshaft is balanced at a workshop if needed.
Why is driveshaft alignment important during assembly?
The driveshaft is balanced in a specific position. If it is assembled one spline out or the parts are mixed up, the vibration may remain or come back. Mark the relative position of the parts before disassembly and align them using the same marks. Balancing is a job for a workshop.