An all new induction system provides cooler airflow and contributes to the increased horsepower rating of the engine. Driveline enhancements were made to increase strength and improve reliability. These enhancements include a stronger front prop shaft and larger U-joints. This is also the quietest idling Duramax diesel engine ever offered in a Sierra HD. Features contributing to its improved quiet operation include an all-new fuel system and acoustic treated rocker covers.
Available Duramax Diesel power and integrated trailering technologies give you the confidence to control heavy loads. Nearly two-thirds of the Sierra cab structure is made from high-strength steels. It’s a fortress of strength that contributes to the Sierra’s quiet cabin. We also use high-strength steel in our fully-boxed frame rails and major frame cross-members. The 2018 GMC Sierra HD All Terrain Package lets you trailer and haul your payload wherever you need to; whether that takes you on a paved road – or off one. Front and rear body-color bumpers, a more aggressive grille and distinct badging let you do it with style and presence.
