My '91 300E has a high pitched whining noise which seems to come from the odometer cable. I just replaced it and still get the noise. The occurrence is sporadic. sometimes when I get up to 70-80 mph it starts and continues until below 500 rpm. Also, sometimes when I get up to 40 mph and back off of the accelerator it starts and again continues to 500 rpm. Recently when I crossed a railroad crossing the bumps made it start at about 30 mph. Ha anyone else experienced this? Scott Egglefield