Hi hoping someone can help as this is getting worse and the garage is failing to diagnose after half a days work two new front tyres and some serious head scratching. When the car is approx 35 -45 mph on uphill a wiggle can be felt through the car through your bum for want of a better explanation it feels like your sat on a washer in spin cycle!Doesnt seem to be gear specific but only apparant on uphill the higher the gradient the worse it is dissapears after 45mph any ideas???