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GMC offers two core versions of the Sierra HD: the 2500 HD and the 3500 HD. The 2500 HD provides up to 4,178 pounds of payload capacity and a 22,430-pound towing limit (gooseneck/fifth-wheel rating). The 3500 HD is built to handle up to 7,290 pounds of payload hauling or a maximum towing capability of 36,000 pounds (gooseneck/fifth-wheel rating). While the 2500 HD has a single rear wheel (SRW) setup, the 3500 HD comes as either an SRW or dual-rear-wheel (DRW). There are seven trims for this year’s Sierra HD: Pro, SLE, SLT, AT4, Denali, AT4X, and Denali Ultimate.
The three cab styles for the ‘24 Sierra HD are regular (two doors), double cab (two standard front doors and two rear access doors), and crew cab (four standard doors). There are also two cargo bed lengths: standard (82.2 inches) and long (98.2 inches). The regular cab/long bed combination is exclusive to the Pro and SLE, while the other cab and bed combinations vary by version (2500 HD or 3500 HD) and trim level.
The standard powertrain consists of a 6.6-liter gasoline-burning V8 (401 horsepower and 464 lb.-ft. of torque) and an Allison 10-speed automatic transmission. The optional 6.6-liter Duramax Turbo-Diesel V8 engine (standard with the Denali Ultimate) makes 470 horsepower and 975 lb.-ft. of torque. Rear-wheel drive is standard on the Pro, SLE, and SLT, with four-wheel drive (4WD) available. 4WD is standard on the AT4, Denali, AT4X, and Denali Ultimate.
The work-focused Sierra HD Pro focuses on the essentials, which means a locking tailgate, vertical trailering side mirrors, chrome bumpers, cargo tie-downs, side bed steps, a corner-step rear bumper, tailgate and bed rail protection caps, and 17-inch steel wheels. The interior of Pro has vinyl upholstery, single-zone climate control, a 40/20/20 front split-bench seat with four-way manual adjustments for the driver and outboard passenger, a rubberized floor covering, a 3.5-inch driver information display, rear vents, a 60/40 split-folding rear bench seat, and a manual-tilt steering column.
The GMC MultiPro tailgate with power lock and release is one of the many standard features of the SLE. This trim also gets fabric upholstery, remote keyless entry, power-adjustable side vertical trailering mirrors, deep-tinted rear glass, a 4.2-inch color driver information display, carpeting, and 17-inch aluminum wheels.
The SLT receives more premium appearance and convenience equipment, such as remote start, proximity keyless entry, perforated leather upholstery, dual-zone automatic climate control, a ten-way power driver seat and outboard front passenger seat (with heat), a 40/20/40 front split-bench seat with under-seat storage, a driver’s position memory system, a 12.3-inch driver information center, and push-button start. It also gets GMC’s ProGrade Trailering System, LED headlights and fog lamps, LED cargo bed lighting, power side mirrors with power-folding and auto-dimming functionality, chrome exterior accents, an auto-dimming rearview mirror, and 18-inch aluminum wheels.
GMC gives the AT4 numerous off-road features, like an enhanced suspension with upgraded shock absorbers, a two-speed transfer case with active automatic four-wheel drive, skid plates, a selectable traction control system with off-road and tow/haul modes, hill descent control, and all-terrain tires. It also has black-finished exterior accents, heated and ventilated front bucket seats with a center console, heated rear outboard seats, and a spray-on bed liner.
The plush Denali gets exclusive leather upholstery, a power-sliding rear window, a bed view camera, chrome recovery hooks, chrome assist steps, and 20-inch polished aluminum wheels. The newest trim, the AT4X, gets even more trail-oriented features, starting with a 1.5-inch factory-installed lift and an off-road suspension with Multimatic DSSV dampers. The list goes on with front skid plate (aluminum), a steel skid plate to protect the transfer case, an electronically locking rear differential, Goodyear Territory MT tires, red recovery hooks, and sensors for trailer tire pressure and temperature. It’s made more luxurious with full-grain leather upholstery, 16-way power heated/ventilated front seats with massage feature, vanta ashwood interior accents, power-retractable assist steps with perimeter lighting (LED), a sunroof, a 15-inch head-up display, a leather-wrapped steering wheel, a power-sliding rear window, and a universal home remote.
The Denali Ultimate is equipped much like the AT4X, with the addition of a bright accent strip to its power-retractable assist steps with perimeter lighting. It reverts to chrome recovery hooks and drops most of the AT4X’s trail-focused features (the off-road suspension, transfer-case skid plate, and e-locking rear differential). There is an extensive list of upgrade packages that GMC extends for the Sierra HD. Some features can be added as individual options to the SLE and SLT.
Sierra HD Pro Safety, a collection of advanced driver aids, comes installed on every trim. These features include forward collision alert, automatic emergency braking, front pedestrian braking, lane departure warning, a following distance indicator, and automatic high beams. Blind-spot monitoring with rear cross-traffic alert is available on the Pro, SLE, and SLT and is standard on the higher trims. Adaptive cruise control is included on the Denali Ultimate and available for the lower trims. A surround-view monitor is optional.
GM’s Safety Alert Seat (the driver’s seat vibrates with a safety warning) is optional on the SLT and included with the higher trims. A surround-view monitor can be added to the SLE and SLT and is standard with the AT4 and higher trims. The truck’s other safety equipment includes multiple airbags, anti-lock brakes (ABS), electronic stability control, traction control, hill start assist, a rear seat reminder, and a rearview monitor.
Most Sierra HD trims get a 13.4-inch touchscreen infotainment system with Google built-in (the Pro has a 7-inch screen). All versions get a multi-speaker audio system, Bluetooth, multiple USB ports, and access to a Wi-Fi hotspot and OnStar/GMC connected services (for remote vehicle monitoring and other features). SiriusXM satellite radio is optional for the Pro and standard on the higher trims. A seven-speaker Bose audio system is optional on the SLT and AT4 and included with the Denali. The AT4X and Denali Ultimate get a 12-speaker Bose sound system.