my 86 300e with 157000 miles runs great but has started vibrating under load acc, motor mounts were changed, trans, rubber drive joints aren't very old, new tires, everything under the car is tight, also just changed cam and rockers, 15000 on valve job, just can't figure whats vibrating, any ideas, thanks

you might want to think about haveing the trans checked it could be slipping and that is called a shudder in transmission terms if you put the gas on the floor from a dead stop and the enging starts to free wheel than its a go on a rebuild the band servo is not holding, the seals in it get hard from the heat cycles of 150,000 miles and it does not have the ability to hold the drum from turning when it is susposed to hold it still hence the shudder or vibration - jz

no it doesn't freewheel, just put lucas trans. stuff in it

One of my spark plug wires was loose...You may also want to check other ignition components.

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J.H.
'86 300E

no plugs are good new wires, it does not vibrate till around 50, can't feel accelerating until then, even with it on jacks

I assume the E-class has a two-piece driveshaft like the S-class. The center bearing and u-joint can certainly cause vibration, even if the front and rear flex-couplings are good.

DG