I have a 1995 E320 wagon. It has a slight vibration in the steering wheel that comes and goes. I have tried new steering dampener, struts, wheels and tires. I aligned the car and also took off the rotors and regreeased the bearrings, as well as dynamic balance on all 4 wheels. I'm stumped.I can't seem to get the problem to go away. Sometimes the vibration is in the seat as if the rear end is wagging back and forth. Help!

 

Check the flex discs.

 

I will give it a shot thanks!