RAM 4500, 3500 +1 more: Powertrain

The hazard

On certain cab chassis trucks, due to a defect in the transfer case, the rear main output shaft could fracture. This could result in a loss of motive power, which, in conjunction with traffic and road conditions, and the driver's reactions may increase the risk of a crash. This would also cause a loss of PARK functionality when in two wheel drive, potentially leading to unintended vehicle movement. These issues could result in injury and/or damage to property Correction: Dealers will replace the transfer case. Note: The vehicle will remain operable in four wheel drive.

What to do

Contact your dealer; the remedy details were not included in the filing.