That exactly describes my Galaxy too (2000 model 2.8 engine). I have had the driveshafts repaced - that may have made it better or worse. It may not have the same sort of shimmy feeling it had at light acceleration, but if I accelerate hard, I can feel the vibration. It may just overall be just getting worse, and the driveshafts didn't make any difference or.... I've not been on a long trip since the last one as it was quite scary - driving along the motorway was like being on a cattlegrid - not for the first few miles, but it starts after 20 to 100 miles. I turn off onto A road, and it stops and won't come back. Very hit and miss problem. I also found this - not sure, but maybe... "This is not an uncommon fault on the ford galaxy,or any ford with front wheel drive, the cause is 100% the track control arms (lower suspension arms) and if your not happy with my answer take your car to a workshop with a rolling road test bed,there they put the vehicle " Also wondering if I have a dodgy tyre or wheel.