Hello
It could be your speed sensor for the cruise contoll. Try looking for a round cylinder in line with the spedo. cable. Unscrew the connection and see if your noise goes away. Of course the spedo won't work if that's disconnected. I am not sure if your car has that set up but it's worth a try. It could also be a dry spedo. cable. If you can get it apart, lube it with white lithium grease.
Mike
