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DETROIT – Led by the first-ever Sierra Heavy Duty Denali Ultimate, the 2024 model year takes the Sierra HD lineup to new heights with premium luxury and comfort, turbocharged pulling power and elevated technology — offering the most trailering assistance technology in its class1.
In addition to the debut of the Denali Ultimate trim, the 2024 Sierra HD will build upon GMC’s premium off-road offerings, introducing the off-road optimized Sierra HD AT4X trim later in the model year.
“The new and enhanced 2024 Sierra HD builds on an already winning foundation,” said Duncan Aldred, vice president of Global Buick and GMC. “This truck elevates the HD segment with the introductions of the Denali Ultimate trim and will soon add the seriously off-road capable AT4X trim, further strengthening the dominance of the GMC truck portfolio.”
Heavy Duty Highlights:
- Enhanced power with the combination of the available 6.6L Duramax Turbo-Diesel V-8 and 10-speed Allison transmission delivering 470 horsepower and 975 lb-ft of torque and providing 25% more low-end torque vs. the current model for a greater feeling of power on demand
- Max towing across the lineup, including:
- Up to 21,9002 pounds on 2500HD Crew Cab – best in class2
- Up to 22,5003 pounds on 2500HD – a 4,000-pound increase over the current model
- Up to 36,0004 pounds on 3500HD
- Most available trailering assistance technologies in its class through GMC’s ProGrade trailering system, offering up to 14 camera views5
- Updated technologies including an available new, largest in-class1 13.4-inch-diagonal tablet-style infotainment7 touchscreen
Fresh and Bold - Inside and Out
The 2024 Sierra HD lineup is elevated with styling and design updates, inside and out. Exterior highlights include:
- Revised front bumper, fascia, grille designs and finishes on each trim
- Animated lighting when approaching, starting, or when using the turn signals
- New wheel designs on SLE, AT4, Denali and larger 18-inch polished aluminum wheels on dual rear-wheel models
- New 22-inch accessory wheels
- Six new exterior colors (extra cost): Titanium Rush Metallic, Sterling Metallic, Volcanic Red Tintcoat, Redwood Metallic, Meteorite Metallic and Downpour Metallic
- Rear wheelhouse liners standard on Denali and Denali Ultimate dual rear-wheel models
First-ever Sierra HD Denali Ultimate - The Most Advanced and Luxurious Pickup in its Class1
The first-ever Sierra HD Denali Ultimate is the most premium, luxurious and technologically advanced Sierra HD yet, equipped with unique enhancements to the overall design and premium interior appointments, more standard technologies and standard turbocharged performance with the enhanced 6.6L Duramax Turbo-Diesel and Allison 10-speed transmission.The Denali Ultimate is distinguished by an exterior featuring a unique grille and GMC badging in exclusive Vader chrome, along with exclusive 20-inch Ultra-bright machined aluminum wheels with High Gloss black accents, and unique fender badging featuring topography of Mount Denali, the highest point in North America. Additionally, Denali Ultimate will include a six-way MultiPro Tailgate with a standard Kicker audio system. Power assist steps also come standard.
Inside, Denali Ultimate’s exclusive Alpine Umber interior reaches new heights of premium luxury and comfort in a heavy-duty truck. Full-grain leather appointments and open-pore Paldao wood meticulously adorn the interior trim. The wood’s darkened finish creates a distinctive color blend, while the unique graining adds bespoke attention to detail. Additional content includes:
- Full-grain leather-wrapped door panels with etched stainless-steel speaker grilles
- Full-grain leather front and rear seats with the Denali Ultimate badge on the front seatbacks and center console lid
- All-new 16-way power-adjustable and massaging front seats
- Premium microsuede headliner, visors and A- and B-pillar trim along with leather-wrapped A- and B-pillar handles
- 12-speaker Bose® Premium series with Centerpoint surround technology
- Standard rear camera mirror6, with full camera display
- Standard 15-inch-diagonal multicolor head-up display
- Standard power sunroof
More power, greater refinement for the Duramax Turbo-Diesel
The available enhanced 6.6L Duramax Turbo-Diesel, paired with the 10-speed Allison transmission, now delivers 470 hp (at 2800 rpm) and 975 lb-ft (at 1600 rpm) of torque, offering more power across the entire operating speed range. Specifically, low-end torque production increases up to 25% compared to the current model for improved towing performance.The 2024 Sierra HD will also offer best-in-class 2500 Crew Cab towing of up to 21,9002 pounds and max 2500 towing of up to 22,5003 pounds, enabled by a new available Max Tow Package.
Additional changes and upgrades were designed to produce a more efficient combustion and enhance overall performance. This latest iteration of the Duramax engines adds additional refinements including:
- An all-new, more efficient turbocharger with improved efficiency to boost low-end torque
- Increased power and torque over the entire operating speed range
- Improved engine braking with a more powerful turbo vane actuator and uprated valve springs
- New cylinder heads with improved cooling jackets
- An all-new combustion system within the heads that’s matched with next-generation, higher-flow injectors and greater fuel injection pressure
- All-new engine controller
The Allision 10-speed automatic transmission is now paired with the Sierra HD’s standard 6.6L gas engine. It replaces the previous six-speed automatic, offering smaller “steps” between the gears, which enables the 6.6L gas engine to hold closer to its peak power (401 horsepower and 464 lb-ft of torque) for longer periods.
That translates into a more confident feeling of on-demand power, regardless of whether the truck is towing a trailer — but when it is, trailering performance and capability are enhanced thanks in part to the 10-speed configuration, along with the capability of channeling every single pound-foot of torque to the tires in every gear.