Chrysler Group may have to share with Nissan Motor Co. the stylish chrome capital C and black block letter Turbo Diesel logo that has adorned Ram heavy-duty pickups for nearly a quarter century.

The 2025 Ram 2500 and 3500 HD has gas and diesel engine options—the standard 405-hp 6.4-liter Hemi V-8 or a 430-hp 6.7-liter Cummins turbo-diesel inline-6. Both are now backed by eight-speed ZF ...