WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Front Propeller Shaft & Grease Fitting
Courtesy of CHRYSLER GROUP, LLC
Vehicles with double Cardan universal joint front propeller shaft (1) are equipped with a grease fitting (2). Grease the double Cardan universal joint at each oil change.