Folks,

I am in dire need of advice and direction in trying to diagnose and eliminate a significant shudder in a 2000 c230. To summarize, the shudder comes and goes intermittently. It seems to start in the center, underside of the car and resonate violently throughout the chasis and is only slightly noticeable in the steering wheel. I have had every, and I mean every steering and suspension component replaced and this problem still persists. The tires are brand new too (Yokohama Advan S4). My mechanic and I are confident that the entire front end of the vehicle is as tight and true as the day it was new. Is it possible that I have a damaged flex disc or u-joint? I haven't returned to my mechanic yet to have him investigate this possibility but in aimlessly searching for the cause, am running short on possibilities here. Any help would be greatly appreciated.

Thanks