Hi everybody,i am new to this site and new to Duramax too.I searched the previous posting and didnt find answer.I hear this SHARP whiseling sound(more like a bad bearing)when i am cruising.could be 35,40,50,60 MPH.so it does it under any speed over 30(not a wind noise),it goes away when i slightly push the gas,release the gas pedal or i am going up the hill(under load).very loud and annoying,i just bought the car and it has 110000 miles.Any help or ideas would be greately appreciated.