2000 instrument panel buzz

2000 Merc GM has horrible buzz behind the instrument panel when going in excess of 55mph. the faster we go the louder it buzzes. Sounds like the odometer cable. has anyone had this?? possible recall or simple fix?

If it is still under warranty take it to the dealer and have a tech go with you to get the noise to re-occur.

Also ask your dealer for any TSB's that may be related to what you are experiencing.