Engineered to burn gasoline, the 2022 Chevy Silverado HD's standard 6.6-liter engine earns SAE-compliant ratings of 401 horsepower and 464 pound-feet of torque. This default powertrain is mated to a six-speed automatic transmission. Running on diesel, the optional Duramax powerhouse also displaces 6.6 L during combustion. Key specifications of this turbocharged powerplant include 445 hp and 910 lb-ft. When customized by a dealer, the heavy-duty Chevy model can tow 36,000 total pounds.