can any one help i have a 1988 mb 300sel that at 80 mph or above violently starts to shake and at least up to 100 mph does not go away under 80 it is as smooth as glass have new shocks, springs , tie rod end assy, center link, steering dampner, even new wheels and tires and had them rebalanced problem just started out of no where so i changed everything since my wife and kids use this car car is mint no rust or anything has 212,000 miles on it dont know where to look thanks jon

Sounds like a bad Drive Shaft Flex Joint http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=26R0X2XXH26R0X3FUV&year=1988&make=MB&model=300-SEL-006&category=K&part=Drive+Shaft+Flex+Joint
Or a bad drive shaft. A drive shaft is the longest bar of the car that connects the transmission to the rear differential.
BTW your car has two Drive Shaft Flex Joint, one front and one rear.

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380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

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