Yes, it does come on at different gears -- but it only starts between 3rd and 4th gears which is when I hit 35-40mph and it stays on intermitently all the way up to 6th gear. I started to pay close attention to it and it consistently comes on at 40 mph. Cannot help hearing it because it is a such a high pitched ringing noise - definitely not a whistling noise.
Thanks!
Thanks!