March 29 (Reuters) - The U.S. Office of Defect Investigations (ODI) has opened a preliminary evaluation of a failure of the K1 snap ring in Chrysler-parent Stellantis' year 2022 RAM 3500, 4500, and 5500 trucks, the National Highway Traffic Safety Administration said on Friday. (Reporting by Arsheeya Bajwa in Bengaluru; Editing by Kirsten Donovan)