Thank you folks. I'll update when I can check things out.

 

my MY00' vibrated at 70-80mph because i had 6+ yr old tires on that bitch. got some new ventus, no more vibrating.

 

Haha! Damn man 6 years! If you check my update, I did end up getting new tires, balance, axles, diff (4.77), and alignment. Science of Speed is only a little over an hour away from me but its all 75 mph highway. I'm not sure if I should dare brave out the vibration for that long. As much as I'd love to have them take a look at my car I think I might want to stick to something nearby. . . . Maybe hah. The vibration is very minor when holding a steady speed.