Vibration Issues between 75-90mph

Originally Posted by FLA370Z

Thanks for everyone's inputs, I actually cleaned all contact surfaces and traded out the rear spacers for another set (I had qty 4 but only use spacers on the rear). I also didn't use spacers and went for a highway run and still had the issue. This leads me to believe that the front tires may have some cupping, I ordered a new set of front tires and will keep everyone updated as to if it was the issue or not.

crazy4oldcars good point about the struts, i am on springs with stock struts. Worth looking into, plus it will give me a legitimate excuse to convince the fiance for me to buy more car parts (coils) lol