When accelerating the car's front end starts shimmying, like a heavy vibration, but only around 60-65 mph and when taking over other vehicles and speeding up from 50 mph to 70 mph. I took it to the local mechanic who greased at one side the union joint because it was dry. He looked at the brakes, struts, shocks and inspected the newly installed tires (for I thought the old tires might have been the problem) and rims but couldn't find anything.