Shakes or Wobbles problem
1998 Vauxhall Vectra Manual 89000 miles
Vauxhall Vectra Estate 2.0 LS. Have recently noticed that car vibrates (even shakes) when driven at speed. As a general rule this occurs between 70-75 mph but has occured at lower speeds (65+) dependant on road surface. Once travelling above 75/76 mph the problem disapears and ride is fairly smooth. While I have no more difficulty controlling the vehicle whilst shaking occurs, it can be extremley uncomfortable. At first, I thought it may be tracking or allignment, but have not experienced any steering wobble or instances of pulling to one side. At roughly same time as problem first occured I also noticed a knocking from the rear of the vehicle when turning right at speed (such as on a roundabout), is it likely the two are related? If anyone has any ideas on the possible cause, I would be very gratefull.
Being very much a novice when it comes to mechanical matters, I always try to seek some advice before visiting a garage.