My 1997 WRX has developed a vibration at around 90-100 km/h.
The vibration is intermittent and will start weather the car is under load or not, the only way it stops is if you come to a complete stop and then get going again. It Seems to be coming from the mid to rear section of the car as it does resonate through the steering wheel. Essentially every bushing underneath it has been replaced withing the last 5000 - 10,000km's , new rear rotors a week ago , all 4 wheels re-balanced a week ago and it is yet to go away.
I have mentioned to the mechanic about it possibly being the driveshaft center support bearing, but it has been checked over and isn't showing any signs of wear or excessive movement.
Any ideas what it could be?