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For the 2024 model year, GMC added two new trim levels to the Sierra 2500 HD lineup above the former range-topping Denali trim. While one is the new Denali Ultimate trim, we’ll look at the new standard for a luxury heavy-duty, off-road truck, the 2024 GMC Sierra 2500 HD AT4X

2024 GMC Sierra 2500 HD trim level pricing, specs, and feature highlights

In addition to the new AT4X trim, GMC offers six trim levels for its 2024 Sierra 2500 HD lineup. 

PRO and SLE trim highlights

The entry-level PRO trim starts at $44,400, and the $48,200 SLE trims feature the most cab/truck bed configuration and powertrain options

Configuration options include combinations of regular, double, and crew cabs with standard and long truck bed lengths. Although the regular cab only comes with a long bed. 

Powertrain options include the standard 6.6-liter gas V8 engine or an optional 6.6-liter turbo-diesel V8. Both are backed by an Allison 10-speed automatic transmission. An optional integrated power take-off (PTO) is available for the diesel engine-equipped PRO and SLE trimmed Sierra 2500 HD models. Each trim also offers optional four-wheel drive (4WD). 

The PRO trim comes with LED headlamps, a trailering package with trailering mirrors, and wireless Apple CarPlay and Android Auto. Additionally, the SLE trim has a 13.4-inch infotainment touchscreen and the MultiPro tailgate.

SLT and AT4 trim highlights

The other GMC Sierra 2500 HD trims only come as crew cab models, with all except the new AT4X featuring a choice in bed lengths. The SLT is the uppermost trim with standard two-wheel drive or optional 4WD, while the rest feature standard 4WD. The SLT and AT4 feature a choice between gas or diesel engines

The $60,500 SLT trim adds dual-zone automatic climate control. Upgrading to the $69,100 AT4 trim gets you heated and ventilated leather-upholstered front seats, a jet-black interior with Kalahari accents, an off-road suspension package featuring twin-tube shocks, skid plates, and 20-inch gloss-black aluminum wheels. 

Denali and Denali Ultimate trim highlights

The Denali features your choice of gas or diesel power, but the Denali Ultimate only comes with the 6.6-liter Duramax turbo-diesel. Both trims come as crew cab models with an option for standard or long bed lengths. 

The $73,200 Denali trim rides on 20-inch ultra-bright machined wheels with bright chrome inserts and features an interior trimmed with authentic open-pore wood, patterned aluminum, and perforated leather seating surfaces. The $91,900 Denali Ultimate features gloss black wheel inserts, a Vader chrome grille, illuminated power assist side steps, an Alpine Umber interior featuring open-pore Paldao wood, 16-way power-adjustable massaging front seats with full-grain leather seating surfaces, and a 12-speaker Bose audio system with Centerpoint surround sound.

The all-new 2024 GMC Sierra 2500 HD AT4X

The all-new 2024 GMC Sierra 2500 HD AT4X trim only comes as a crew cab standard bed length configuration with 4WD. However, you still get a choice between the 6.6-liter gas V8 for $84,795 and the 6.6-liter Duramax turbo-diesel for $94,285. The AT4X features Multimatic DSSV dampers for a smooth, controlled ride on or off-road, a rear locking differential, a factory-installed 1.5-inch lift, 35-inch mud terrain tires, and multiple skid plates.

Inside, you’ll find heated and ventilated 16-way power front seats with a massage feature, an obsidian rush interior with full-grain leather seating, technical-grain leather accents, authentic Vanta Ash wood, and a 12-speaker Bose audio system with Centerpoint surround sound.

Other updates for the 2024 GMC Sierra 2500 HD

In addition to the new trims, GMC announced other updates for its Sierra HD truck lineup. 

  • First, there’s the 25% increase in low-end torque for the 6.6-liter Duramax turbo-diesel, which now provides 975 lb-ft of torque in addition to 470 horsepower. 
  • Next, the 2500 HD saw an increase of 4,000 lbs of towing capacity, up to a maximum of 22,500 lbs on select configurations. 
  • Finally, GMC now includes the 10-speed Allison transmission on gas-powered V8 2500 HD models instead of the old six-speed automatics for improved performance. 

Is the new 2024 GMC Sierra 2500 HD AT4X right for you? If you want to enjoy off-road driving surrounded by a luxurious interior, then the AT4X trim is a capable choice.