Drivers seeking the highest levels of towing capability will be drawn to the available High-Output 6.7-liter Cummins Turbo Diesel inline-six. This engine delivers 420 horsepower along with an impressive 1,075 lb-ft of torque, making it one of the most powerful options available in a heavy-duty pickup. That immense torque is ideal for large fifth-wheel and gooseneck trailers commonly used in commercial, agricultural, and industrial applications.

Matched with a heavy-duty automatic transmission engineered for extreme loads, this high-output diesel allows the 2026 Ram 3500 to reach a maximum fifth-wheel towing capacity of up to 37,090 pounds when properly equipped. An available diesel exhaust brake further enhances control by helping manage speed on long downhill descents, increasing confidence and reducing brake wear while towing.

• 420 horsepower
• 1,075 lb-ft of torque
• Heavy-duty automatic transmission
• Available diesel exhaust brake
• Maximum fifth-wheel towing up to 37,090 pounds when properly equipped

Standard on the 2026 Ram 3500, the 6.4-liter HEMI V8 gasoline engine provides a strong and reliable foundation for heavy-duty work. Producing 410 horsepower and 429 lb-ft of torque, this engine offers confident acceleration and consistent performance for a wide variety of hauling and towing tasks. It is an excellent option for drivers who need substantial capability without stepping up to the extreme limits of the high-output diesel.

The 6.4L HEMI V8 is paired with a heavy-duty automatic transmission and supports competitive towing and payload ratings. With a lower upfront cost than diesel alternatives, this engine is a practical solution for contractors, fleet buyers, and truck owners who need dependable power for work trailers, equipment, and everyday driving.

• 410 horsepower
• 429 lb-ft of torque
• Heavy-duty automatic transmission
• Strong towing capability for work trailers
• Standard engine on Ram 3500 models