On my 97 E320 (37k miles), once I am driving at constant speeds. I feel and hear a vibration from the driver side floorboard all the way to the A pillar. Steering wheel doesn't shake. Motor smooth. I think it has something to do with the driveshaft or flex discs. Just this week I changed the entire driveshaft on my 300E. It made a click just when you hit started moving. What the hell is up with these driveshafts? Also I hear and feel a whirring noise under my feet just when I turn on the car and start driving. Is this sound normal.
01 s600
99 s420
97 e320
96 sl600
89 300e