Recently I have been hearing a humming noise that increases with speed. I don’t get it when the car stops. I think it’s coming from the rear but only when the car is moving and steadily increases in volume as speed increases and comes down as speed comes down. It’s not coming from engine or transmission but coming from the rear wheels. Could it be a bearing? or both bearings? Is hard to make out if it’s left or right of the windows when the windows are closed.
Car drives great and has mileage in the 80’s