Heeeelo again everyone... Long time no hear... well..the babyBenz is at the shop getting the ignition tumbler replaced. Anyways, I wanted to know somthing about something I observe while slowing down to a stop while the airconditioner is on. it seems that there is a sort of clunk (sort of sounds like knocking lightly on the body of the car) while slowing down... it happens 3 or 4 times and I notice the engine tach jumping each time until I come to a full stop. Is this a sign that I'm going to be dishing out a lot of money pretty soon? The trans still shifts very smoothly... just that when slowing down... that clunking sound is heard. any insights?

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'94 MB C280 Lorinser Sport Suspension

Possibly the flex disc on the driveshaft is failing.