Car is a c230 with 140k, 10 years old. Flexdisk done at 80, 2 years ago. Within last 1500 miles started getting this shuddering. Nothing at idle, so no engine mounts. Trans mount? I called the DEALER and they "think" it might be a bad driveshaft. I sure hope not! What do you guys think, before I pay for diagno$i$

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL