I am desperate for some help. I am experiencing a vibration from the front end which slowly creeps up. It can first be felt around 60km/h (35mph) and gets progressively worse with speed. The most intense vibration occurs at around 110-130 km/h (65-80mph) but completely disappears at around 160km/h (100mph).

The car is a 1995 850 Turbo (automatic) with brand new Toyo Proxes FZ4 205/50 with 16" wheels. The problem began about 8 months ago at approx 130000 km (80000 miles) on the odometer. At that time the car was running on 15" inch wheels and Dunlop tires. Since then the tires have been changed for new ones 3 times, the wheels have been changed. Tire and wheel combinations haven been balance about 15 times. Alignment has been done at the same time as the balancing. The drive shaft has been replaced, along with its bearings. The wheel bearing have also been checked and found OK. The struts have been replaced, and so have the tower mounts.

However, the vibration has remained throughout all of these attempts to remedy the problem. Does anyone out there have any suggestions or ideas of what I can do to fix this. Basically every part in the driveline has been checked and re-checked and/or replaced, except the transmission. What do I do next?