vibrations!!!

[bmw111]

hi there

when i get to around 120kph i noticed that my passanger seat vibrates and i can also feel it on the driver seat not hectic but you can see it, iv done wheel balancing and the steering wheel is still but stil have the vibrations? im thinking prop shaft but what on it can cause this?
Also if i pull off quick it feels as if the wheels "twitch inwards" cant explain it but during normal driving there is no problems only happens at quick pull offs. its a 525i E34

 

[Spy007]

Controll arms but just wait till some of the BOFFINS come on. also search forum I know there are a couple of these threads with same problem and the solutions.

 

[Legacy]

Im going with front control arm bushing replacement immenint:mmm:

 

[rick540]

Possible rear subframe mounts (The twitch), how's the car in a straight line on the highway?

 

[bmw111]

Possible rear subframe mounts (The twitch), how's the car in a straight line on the highway?

it run straight as an arrow

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Possible rear subframe mounts (The twitch), how's the car in a straight line on the highway?

it run straight as an arrow

but what causes the vibration?