I have a "shake" in my 72 Swinger that is driving me crazy!! Now for the fun part...... it will change intensity depending on which direction I am travelling. Ya, it sounds nuts but if I travel into the wind it is different if I travel on a road with a side wind or it is even worse with no wind blowing at all. The shake occurs around 58 mph and is worse at 65 mph and I can drive out of it around 70 mph and up. I have new tires, wheels, driveshaft balance, rotors, drums, basically anything that rotates has been replaced. Could it be a suspension part? I have new upper control arm bushings, ball joints and tie rods. I have a new pitman arm also. The car was an original drum brakes all around car but I swapped in the 74 front disc set up and 8.25 rear out of a donor car. The hood and front fender shakes and this is not a driveline vibration. When I get to the "shake" speed of 65 mph, I speed up a bit and then coast in neutral down to 65 and there it is. The thing that boggles my mind the most is that I was travelling to a car show this weekend and when I was into the wind going west, I could drive 65 with no shake at all but when I turned to my south turn off, the shake re-appeared. Aerodynamics??? I need some help with this one guys. Thanks