SERVICE BULLETIN - WHILE DRIVING AT HIGHWAY SPEEDS (55 MPH AND ABOVE), THERE IS A LOW-FREQUENCY RUMBLE THAT CAN BE HEARD, OR A VIBRATION/BUZZ THAT CAN BE FELT IN YOUR LEGS THAT COMES THROUGH THE SEAT AND FLOOR. THIS VIBRATION IS TYPICALLY NOT FELT AT SPEEDS UNDER 55 MPH AND IS NOT THE SAME FEELING AS A TIRE IMBALANCE.