RAM 2500 Van V8-318 5.2L VIN T Magnum CNG SFI (1997)
Drive/Propeller Shaft: Testing and Inspection
Vibration
Tires that are out-of-round, or wheels that are unbalanced, will cause a low frequency vibration.
Brake drums that are unbalanced will cause a harsh, low frequency vibration.
Driveline vibration can also result from loose or damaged engine mounts.
Propeller shaft vibration increases as the vehicle speed is increased. A vibration that occurs within a specific speed range is not usually caused by a
propeller shaft being unbalanced. Defective universal joints, or an incorrect propeller shaft angle, are usually the cause of such a vibration.