Hello all. This is my first post on any forum so please bear with me. The car is an 84 300D turbo with 209,000 miles. I get a droning in and out vibration at 50mph, but only while accelerating. I feel it in the floor, seat and steering wheel. I have replaced the CV axles, center support and bearing. This did not help at all. All inputs would be greatly appreciated. Thank You.