2024 GMC Sierra HD Trucks Go Big, Powerful, and Luxurious
High-tech features promise to make trailering easier and driving safer
2024 GMC Sierra 2500 HD AT4
By Jeff S. Bartlett
This has become a season for heavy-duty trucks, with GMC revealing its upcoming 2024 Sierra HD, right on the heels of the unveils for the related Chevrolet Silverado HD and updated Ford Super Duty. These are all burly trucks that promise heightened work capability, creature comforts, and advanced safety features. GMC looks to distinguish itself further as the upscale alternative to Chevrolet, adding a new, richly appointed Denali Ultimate trim.
Otherwise, there is much in common with the two GM-branded vehicles, from basic configurations to shared powertrains.
The Sierra HD will be offered in regular cab, extended cab, and crew cab body styles, with a choice of two bed lengths, rear- and four-wheel drive, and two powertrains: gasoline and diesel.
The 6.6-liter gasoline V8 returns, but a 10-speed automatic transmission replaces the previous six-speed. The turbodiesel V8 gains more grunt, with 470 hp and a hearty 975 lb.-ft. of torque. When equipped with the optional turbodiesel and a dual rear-wheel setup, the two-wheel drive GMC Sierra 3500HD can tow a massive 36,000 pounds.
The Sierra HD trucks come with a standard suite of active safety systems, including automatic emergency braking with pedestrian detection—a particularly welcome feature, given the height of the massive hood.
Available trims include Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate.
The Sierra HD goes on sale in early 2023, with the AT4X following later in the year.
What it competes with: Chevrolet Silverado 2500HD/3500HD, Ford F-250/F-350, Ram 2500/3500
What it looks like: A tougher, bulkier version of the GMC Sierra 1500.
Powertrains: 401-hp, 6.6-liter V8 engine or 470-hp, 6.6-liter turbodiesel V8 engine; 10-speed automatic transmission; rear- or four-wheel drive
Price: $40,000-$75,000 (estimated)
On sale: Early 2023
The GMC Sierra HD lineup spans from basic work truck to luxurious haulers.
Photo: GMC
CR's Take
The battle of the big trucks is on, with GMC bolstering its work credentials while bringing more comfort, technology, and safety to the fray. Customers who were fond of the outgoing truck will find even more to appreciate in the 2024 version.
The base trims are quite capable, with even the standard engine being quite potent. The eye-catching new equipment will come at a price, as we see the entire class become increasingly expensive and feature-laden, with conveniences like power running boards and the clever tailgate with an integrated step.
The improvements we most appreciate center around the upgraded standard equipment, notably the active safety gear.
Outside
Looking like the tough older brother to the Sierra 1500, the heavy-duty trucks feature a fresh front bumper, grille, and lighting, granting them an updated appearance. The lights now feature animation when the driver approaches or uses the turn signals. New trim elements further sharpen the looks.
There are six new exterior colors, but they carry an added cost. And the Denali Ultimate has a six-way tailgate with an integrated Kicker audio system.
The Denali Ultimate boasts a unique grille, 20-inch machined aluminum wheels, and an innovative six-way MultiPro tailgate.
Photo: GMC
Inside
The cabin looks evolutionary. The shapes and details of the dashboard and other surfaces are a bit different from the Chevrolet truck interiors, but the overall configuration and layout are similar. Some controls, such as the volume and trailer brakes, are in different places and the air vents are oriented differently. In the higher trims, the GMC looks decidedly upscale. The showoff element is an available 12.3-inch instrument panel screen and 13.4-inch infotainment screen. There is a large 15-inch head-up display offered, as well.
As shoppers step through the trims, a long list of conveniences are piled on. The appropriately named Ultimate trim brings so much leather that it is applied to the doors, offset by a microsuede headliner. It has a 12-speaker Bose stereo, 16-way power-adjustable seats with a massage feature, power moonroof, and dark wood trim around the cabin.
The Ultimate trim brings all the bell and whistles, along with full-grain leather upholstery and door trim.
Photo: GMC
What Drives It
The standard engine will remain a 401-hp, 6.6-liter gasoline V8 with 464 lb.-ft. of torque. The 10-speed automatic transmission will allow the engine to better optimize power, compared with the previous six-speed. It’s also likely to improve the big truck’s fuel mileage.
For serious towing chores, there is an optional Duramax 6.6-liter turbodiesel V8 mated to an Allison 10-speed automatic transmission. For 2024, this burly powerplant sees an increase to 470 hp along with a prodigious 975 lb.-ft. of torque. That torque figure is an important number when it comes to heavy-duty pickups because low-end power is a big aid when climbing up steep grades with a trailer in tow.
To that end, the Max Tow package enables the 2500 to have a towing capacity of up to 22,500 pounds in conjunction with the turbodiesel engine—an increase from up to 18,500 pounds with the outgoing version. The Sierra 3500HD with the turbodiesel and a dual rear-wheel setup can tow up to a whopping 36,000 pounds, which is the same as before.
Aiding with towing duties is a raft of clever technologies available to assist with hitching and trailering. This includes bed- and hitch-view cameras, a blind spot warning that factors in the trailer, and a warning if the truck and trailer weight exceeds the vehicle’s gross combined weight rating (GCWR). Plus, there’s a new Adaptive Cruise Control with Trailer feature that factors the additional drag of a trailer when accelerating and the increased braking distances due to the trailer’s extra weight.
Safety and Driver Assistance
The Sierra HD trucks come with forward collision warning, automatic emergency braking with pedestrian detection, lane departure warning, and automatic high beams. Available features include adaptive cruise control, rear cross traffic warning with reverse automatic emergency braking, and trailer-compatible blind spot warning.
GM’s Super Cruise active driving assistance system, which is available on the Sierra 1500, was not added to the HD models.
Among the available trailer-assist features is the rearview camera mirror that provides a clear view behind the truck.
Photo: GMC
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