– The Sierra HD blends country-boy roots with big-city glitz. As the Chevy Silverado HD’s fraternal twin, the Sierra HD shares its chassis and optional Duramax diesel/Allison transmission duo. They yield a class-leading 445 horsepower and an eye-popping 910 lb-ft of torque that’ll tow up to 23,300 pounds behind the 3500HD. Mix and match two […]
