The powerful yet sophisticated Duramax engine, first introduced to the Sierra stable for the 2023 model year, delivers increased power and torque for world-class on- and off-road capability in the AT4X.
Today, GMC announced a major milestone for its extreme off–road Sierra 1500 AT4X trim. All AT4X models of the Sierra 1500 will now come standard with the rugged and refined second–generation 3.0L inline–six Duramax Turbo–Diesel engine, bringing a significant boost in power, torque, and performance to off–road enthusiasts.
The Duramax engine received several key component upgrades, including steel pistons with a revised combustion bowl, a retuned turbo compressor, new fuel injectors, and improved temperature control features. The result is an impressive 305 horsepower and 495 lb–ft of torque – a 10% increase in power and a 7.6% increase in torque compared to the MY22 model.
John Barta, GM assistant chief engineer of Diesel Engines, commented on the engine’s refinements, saying, “These refinements of the 3.0L Duramax Turbo–Diesel engine took an already awesome engine and made it even better for off–road applications. The outstanding low–end torque combined with the smooth and quiet power of this diesel engine, make it ideal for customers requiring on–road capability for things like towing, as well as off–road adventures like long–distance overlanding.”
The Duramax engine will continue to be assembled at GM’s Flint Engine Operations plant in Michigan, and will be available on the Sierra 1500 AT4X later this summer.
The Sierra 1500 AT4X also comes with advanced off–road capability, premium technology, and an exclusive, luxuriously appointed interior. Standard features such as Multimatic DSSV dampers, front and rear e–locking differentials, combined with the additional capability of the available AEV edition, make the AT4X the most off–road capable factory Sierra 1500 ever.
The Sierra 1500 AT4X comes with features like full grain leather–wrapped massaging front seats, authentic ash wood trim, a 12–speaker Bose Premium Series audio system and more than 40 diagonal inches of combined digital displays.
The Sierra 1500 AT4X also comes with additional new features for the 2024 model year, including power retractable assist steps on Denali, Denali Ultimate, AT4 and AT4X, available active exhaust for Denali, Denali Ultimate, AT4, AT4X and SLT, two additional premium aluminum wheels, and two new unique and bold exterior paint colors, Downpour Metallic and Thunderstorm Gray.
Finally, the 2.7L Turbo High–Output Engine will now carry the name TurboMax for the 2024 model year. With 310 hp, a best–in–class standard torque rating of 430 lb–ft and max available towing of 9,500 lbs, the TurboMax engine provides GMC Sierra 1500 Elevation, SLE, and Pro customers with the power and capability necessary to take their work or hobbies further, whether that’s towing gear or tackling off–road trails.
Today’s announcement marks a major milestone for GMC and off–road enthusiasts alike. With the rugged and refined second–generation 3.0L inline–six Duramax Turbo–Diesel engine now standard on the Sierra 1500 AT4X, GMC customers will be able to go further and explore more in their off–road adventures. The engine’s improved low–end torque, combined with the Sierra 1500 AT4X’s advanced off–road capability and luxuriously appointed interior, make it the perfect vehicle for those looking for a comfortable, powerful, and capable off–road experience. With the engine’s availability later this summer, customers will soon be able to explore even more of what the great outdoors has to offer.