A few months ago, we noticed that our '02 Wrangler had developed a high speed vibration. The vibration starts up right around 60 to 62 MPH. It actually seems to lessen a little as speed reduces, but is certainly still there. We initially assumed it was related to the tires which were over 5 years old and badly worn, but we have since gotten new tires and the vibration is still there. I also recently realized that the vibration started around the time we serviced the brakes. Is it possible this is related to an out of balance drum or rotor? Otherwise I'm thinking possible out of balance drive shaft. The vibration is speed related, not RPM related (happens at the same speed regardless of being in 4th or 5th gear).