I have the same problem. Mine's not as severe as yours sounds, but my shaking starts right around 65 and tapers off after 80, with the worst being right at 70-75. I've got LOTS of tread left on mine, so I know that's not it. I'm not missing any weights on the wheels either. Could it be some sort of alignment problem?

BrApple-its all in the way it is presented...but everythign on my resume is all me TexasRealtor-I hope you spelling improves on your resume. MxRacer-ladies and gentlemen, welcome to ironyville. population, texasrelator.