The GMC Sierra 2500 and 3500 are heavy-duty pickup trucks that are available in a tremendous range of configurations from simple tool to leather-lined luxury tug. Nothing major changes for the Sierra HD for the 2026 model year, with just a couple of new colors available and GMC’s MultiPro Tailgate now optional on the SLT trim level. For 2026, the GMC Sierra 2500 starts at $49,295 and the 3500 at $50,495 (all prices include $2,595 destination charge).
Related: 2024 GMC Sierra 2500 Denali Ultimate Review: Bigger, Better, Even More Expensive
Release Date and Pricing
The 2026 GMC Sierra HD is on sale now, and full pricing is below.
Sierra 2500
- Pro: $49,295
- SLE: $56,095
- SLT: $67,295
- AT4: $74,195
- Denali: $77,595
- AT4X: $86,295
- Denali Ultimate: $96,395
Sierra 3500
- Pro: $50,495
- SLE: $57,295
- SLT: $68,495
- AT4: $75,395
- Denali: $78,695
- Denali Ultimate: $99,795
Cab and Bed Configurations
Like the competition from Ford and Ram — as well as its mechanical sibling, the Chevrolet Silverado — the Sierra HD comes in two strengths: 2500 and 3500. The Sierra 3500 offers buyers the additional choice of single or dual rear wheels, with the wider footprint of the dual-rear-wheel truck inflating the maximum towing capacity by nearly 10,000 pounds, to 31,600.
The Sierra HD is available with three cabs and two bed lengths. The regular- and double-cab Sierras are only available in the two most affordable trim levels; buyers wanting a more luxurious work truck will have to opt for a crew cab. The standard bed measures 6.8 feet and the long bed 8.2 feet.
Powertrain Specs
Regardless of bed and box combination and in both the 2500 and 3500 trucks, the Sierra HD’s standard engine is a gas-burning 6.6-liter V-8 that makes 401 horsepower and 464 pounds-feet of torque. An optional turbo-diesel 6.6-liter V-8 generates 470 hp and 975 pounds-feet; it’s optional for all configurations and standard on the range-topping Denali Ultimate. The diesel engine is also available with an integrated power takeoff for running jobsite equipment.
Both engines are backed by a 10-speed automatic transmission. Rear-wheel drive is standard on the base Pro trim level, and four-wheel drive is available for $2,800; 4WD is standard on the rest of the lineup.
Official fuel-economy estimates are not available for the Sierra HD, as the EPA doesn’t rate the fuel efficiency of heavy-duty trucks.
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Trim Levels
The Sierra HD Pro is about one thing only: work. Standard equipment includes a trailer hitch receiver and wiring, an integrated trailer-brake controller and a locking rear differential. It rides on 17-inch steel wheels and has black plastic door handles, a manually adjustable front bench seat, a tilting (but not telescoping) steering wheel, vinyl flooring and vinyl upholstery. Its few frills consist of LED exterior lighting, push-button start, six speakers, and a 7-inch touchscreen with wireless Apple CarPlay and Android Auto.
Task masters who care just a little bit about the comfort of their minions can opt for the SLE. It gets carpet, cloth seating and a 13.4-inch touchscreen with Google Built-In and satellite radio, as well as GMC’s EZ Lift damped tailgate for easier opening and closing. The SLT can be identified by its body-color door handles and 17-inch aluminum wheels.
GMC opens the features firehose on the SLT, which builds on the SLE with towing mirrors, an in-vehicle trailering app with electrical diagnostics and trailer tire pressure monitors, and rear-wheel-well liners to cut noise and protect against rust. The SLT also gains rain-sensing windshield wipers, a rear window defroster, upgraded LED taillights, chrome mirrors and door handles, 18-inch wheels, an alarm and keyless entry. Inside, it boasts perforated leather upholstery, a tilt and telescoping steering column, a power-adjustable driver’s seat with memory, a heated steering wheel, heated outboard front seats, dual-zone automatic climate control and a 12.3-inch digital instrument cluster.
The AT4 brings some off-road capability to the Sierra HD. It rides on a retuned suspension with Rancho shock absorbers, as well as black 20-inch wheels wearing all-terrain tires. It’s fitted with skid plates to protect the engine and transfer case, red recovery hooks, hill descent control, body-color bumpers, a spray-on bedliner and the MultiPro Tailgate. GMC also throws in some comfort goodies, including power-adjustable front bucket seats with heating and ventilation, heated outboard rear seats, dual-zone automatic climate control, remote start, wireless phone charging and a seven-speaker Bose sound system.
GMC’s signature Denali trim keeps the AT4’s off-road gear but switches to all-season tires on chrome 20-inch wheels and chrome recovery hooks. Its cab is capped with amber marker lights and sports a power-sliding rear window.
Only available on the Sierra 2500 crew cab with the standard bed, the AT4X goes all in on off-roading, with a 1.5-inch suspension lift featuring trick Multimatic shock absorbers, an electronically controlled locking rear differential, 18-inch wheels wrapped in mud tires and a matching spare. It also features a moonroof, power-retractable running boards, upgraded leather and a 12-speaker Bose audio system.
Like the standard Denali and AT4, the Denali Ultimate gets most of the AT4X’s backcountry upgrades minus the suspension lift and mud tires. Available exclusively with the diesel V-8, the Denali Ultimate also builds on the AT4X’s feature set with a unique brown leather interior and wood trim, dark-chrome exterior accents, a Kicker sound system built into the tailgate and a rearview mirror camera.
Standard and Available Safety Features
Standard safety tech on the 2026 GMC Sierra HD includes forward collision warning with pedestrian detection, automatic emergency braking, lane departure warning, a following distance indicator and automatic high beams.
Adaptive cruise control, front and rear parking sensors, blind spot monitors and rear cross-traffic alert are optional on the Pro, SLE and SLT and standard on the rest of the lineup. A 360-degree camera system is available for the SLE and SLT and standard on the AT4s and Denalis. A 15-inch head-up display is optional on the AT4 and Denali and standard on the AT4X and Denali Ultimate.
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