w211 e280cdi sport vibration

[BIG_G_1979]

Hi guys a drove 211 miles on motorway today and I have discovered a vibration at first I thought rear wheels need balanced (the vibration is coming thru seat of Pants not steering wheel) but what I have also noticed is that if squeeze throttle I can make make it vibrate more or less depending on load, this vibration seems to only occur over 60mph and probably at its worse around 70mph well from what I can feel that is, any clues or suggestions

 

[AMGeed]

I'd take a look at the engine and gearbox mountings for wear.

 

[BIG_G_1979]

Thanks if was gearbox or engine mount would it not vibrate all the time? How can I check mounts?

Any issues around propshafts? Is there rubber donuts on these?

 

[Lyserman]

Have a look at the rubber bushing in the propshaft.
If it starts to break down then it can cause vibration.

 

[AMGeed]

Thanks if was gearbox or engine mount would it not vibrate all the time? How can I check mounts?

Any issues around propshafts? Is there rubber donuts on these?

If the engine mounts are worn you can often see the engine physically move when its revved. A pry bar on the gearbox mount shows if it moves or not.

Thinking about it more, Lyserman's theory is more likely