I have a vibration on my 3.2 V6 Elite aswell, although I can feel it mainly through the car, not just the steering wheel. It can come in at any speed above 70. Sometimes I can drive through it if I go above 90. Strange thing is though if I slow to below 60 and then accelerate it will start at a different speed. If i hold it correctly just at the start it will vibrate for 2 seconds and then go for 2 seconds, repeating this cycle for as long as I stay to that particular speed. I have checked the prop shaft and the centre joint does have slight play, but bing a typicle mechanic I hav'nt yet got round to fixing my own car. i have just lived with it, like my engine management light - it's like an old friend to me and I miss it when it goes out.