90 760 - feel slight vibration of car from stop ????

yogachifu · Post by **yogachifu** » 15 Feb 2005, 23:28

Please help !! When I take off from a dead stop i can feel a vibration from the rear and middle of car from underneath ??? We checked tranny mount and carrier berring and all seems fine ?? any one out there ever have a similar problem ??? Thanks for your help.

explanger · Post by **explanger** » 18 Feb 2005, 12:48

You should check to make sure your disk rotors are not warped. The other problem I had was the drive shaft became out of balance. I have been informed that the drive shaft balance problem is fairily common.

agood · Post by **agood** » 18 Feb 2005, 18:57

Mine is doing the exact same thing....from a stop...don't see how your brake rotors could have anything to do with it....let me know if you figure it out...
Thanks

Volvord · Post by **Volvord** » 19 Feb 2005, 10:32

Is your car a sedan or wagon?
A vibration like you describe can be caused by worn suspension bushings which cause too great a pinion angle on acceleration. The reason I ask if your car is a sedan or wagon is that the sedan has independent rear suspension which would not have this problem, whereas the solid rear axle of the wagon this is a more common problem.

I have not heard of any driveshaft balance problems, although it definitly can happen, more often the 2 piece driveshaft is installed out of phase after repairs which will also set up a vibration.

Brake rotor warpage is common but is easy to identify, the vibration is only felt under braking, there will not be any noticable vibration while accelerating or driving.

Lars · Post by **Lars** » 04 Mar 2005, 04:39

yogachifu wrote:Please help !! When I take off from a dead stop i can feel a vibration from the rear and middle of car from underneath ??? We checked tranny mount and carrier berring and all seems fine ?? any one out there ever have a similar problem ??? Thanks for your help.

You will find the problem at the rear end of the automatic gearbox. The shaft support or bushing (wathever you call it in english) is worn out. Check the radial play at outgoing shaft. It should be zero!

/Lars