I drive a Nissan Maxima 1996. This week the car started shaking when I drove over 70 mph. I especially feel the shaking through the steering wheel. When I slow down to 60-65 mph I don't notice any shaking. I'm going to take the car to the mechanic Saturday, but just wanted to get any ideas on what could it possibly be? My guess is I need a wheel alignment/balance? In the meantime I guess I'll save gas by driving slower.