I noticed a vibration at about 80mph a while ago. Went and got the front wheel balanced but this made the car un-drivable. They said it was the driveshafts...
Swapped all my wheels with a friend's Vectra who doesn't have a vibration and it made it better but didn't clear it.
Had all my wheels re-balanced somewhere else and it is now as it was with my friend's wheels.
The vibration is less now but still there between 70 and 80mph. My car is a 2001 Vectra B 150 SRi. Anyone got any idea where to start or what it could be?