Need a truck that can handle big jobs? The 2026 Ram 4500 Chassis Cab has two engine choices to get work done. Go with the 6.7-liter Cummins Turbo Diesel for 360 horsepower, plus a Smart Diesel Exhaust Brake that helps you stay in control going downhill. Or pick the 6.4-liter V8 HEMI with 375 horsepower if you want gasoline power. An 8-speed heavy-duty automatic transmission comes with both options.