[olwebley]

My '94 Safari has a similar problem, The vibration is worst at 110KMH. All the wheels have new rubber and have been balanced. I took the driveshaft (there was a smooth spot on the shaft that suggested a thrown weight) to a balancing shop and it did nothing to alleviate the problem. I have to think that it was not balanced at that shop. I'm considering going to a wrecker to get another driveshaft.

Does anyone know how to calculate the driveshaft's rpm at any given road speed?