Hey guys I need some help, sugestions, or fixes for a problem with my 02 GT 'vert. The car wants to vibrate at highway speeds. I currently have a set of FMS G springs and Tokico non-adjustable shocks and struts, but this problem has been going on even before they were put on. All Ford would do is rotate and balance the tires, but that would not help. The vibration is not a constant thing either. for example around 66 mph the car starts vibrating then as you accelerate to 70mph it eases off then after 72 mph it starts back. Also with the top down it doesn't seem to do it as often. Any ideas would be appreciated. By the way the warranty is gone so any repairs will be comming out of pocket.