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This would not be a motor mount issue. What you are describing seems to be an issue with the transmission. IIRC, the C230 is a rear wheel drive vehicle. Only a front wheel drive vehicle would produce anything like what you are talking about with bad motor mounts, but then it will be far less noticeable. A motor mount problem will not create the jolt like ...


Sounds like you need to look at the rear bushing of the front wheel control arms. These are made of rubber on most cars and don't last beyond 100k. The thunk you feel is because a normal bushing has firm hold of the connection with the control arm, where as your control arm is probably loosely held in place by worn rubber. When you accelerate, the forces ...

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