2026 GMC Sierra 2500 HD Overview

The latest GMC Sierra 2500 HD has everything you need to take on anything the roads of Beaufort can throw your way, but don’t just take our word for it. In our detailed guide, we highlight the key features and capabilities of this heavy-duty pickup truck. As your trusted Chevy GMC dealer in Walterboro, SC, Cooper Chevrolet GMC is here to map out every detail. We encourage you to read our guide and see what you can expect from the 2026 model before taking it for a test drive at our dealership! Whether you are managing a local job site or hauling heavy trailers across South Carolina, this heavy-duty icon stands ready.

2026 GMC Sierra 2500 HD Trims & Key Features

Summerville drivers will be able to choose from seven configurations for the 2026 model year, ranging from utilitarian workhorses to top-tier luxury flagships. With 4WD now standard across almost all model configurations (except the base Pro trim), you can expect superior handling across any terrain. Here are some of the key features each configuration has to offer:

Pro

• 6.6L V8 gas engine with Allison® 10-speed automatic transmission
• Trailering Package, Trailering Mirrors, and Trailer Brake Controller
• Best-in-class HD cargo bed volume
• Wireless Apple CarPlay® and wireless Android Auto™ compatibility

SLE

Includes Pro key standard features, plus:

• 13.4-inch diagonal center touchscreen and 12.3-inch diagonal digital Driver Information Center with seamless Google Built-In integration
• Traction Select System with Tow/Haul mode
• 17-inch machined aluminum wheels

SLT

Includes SLE key standard features, plus:

• 10-way power driver and front outboard passenger heated seats with lumbar support
• Heated steering wheel
• ProGrade® Trailering System with an intuitive In-Vehicle Trailering App
• 18-inch machined aluminum wheels with dark grey metallic accents

AT4

Includes SLT key standard features, plus:

• Exclusive Jet Black interior with eye-catching Kalahari accents, paired with heated and ventilated perforated front leather seating surfaces
• Exclusive 20-inch gloss-black aluminum wheels with available BFGoodrich® off-road tires
• Off-Road Suspension Package featuring twin-tube Rancho™ shocks and protective skid plates
• Up to 14 available camera views with HD Surround Vision and Transparent Trailer View
• Adaptive Cruise Control optimized with trailering software

AT4X

Includes AT4 key standard features, plus:

• Factory-installed 1.5-inch suspension lift, racing-bred Multimatic® DSSV dampers, rear electronic-locking differential, larger steel transfer case skid plate, and a front aluminum skid plate
• Massive 35-inch Goodyear® Territory MT tires
• 16-way heated and ventilated power front seats with an integrated massage feature
• Premium Obsidian Rush interior featuring full-grain leather seating with technical-grain leather accents and authentic Vanta ash wood trim

Denali

Includes SLT key standard features, plus:

• 20-inch Ultra-Bright machined aluminum wheels adorned with bright chrome inserts
• Denali-exclusive authentic wood trim, patterned aluminum accents, and premium Forge perforated leather seating surfaces
• 12-way heated and ventilated power front seats

Denali Ultimate

Includes Denali key standard features, plus:

• Commanding Duramax 6.6L Turbo-Diesel V8 engine with Allison® 10-speed automatic transmission
• Signature Vader Chrome grille and exclusive 20-inch Ultra-Bright machined aluminum wheels with gloss-black inserts
• Exclusive Alpine Umber interior featuring full-grain leather seating, authentic Paldao wood, and 16-way power front seats with premium massage features
• 12-Speaker Bose® Premium Series with Centerpoint® surround sound system
• Illuminated power-retractable assist steps and MultiPro™ Tailgate Audio System by KICKER®

2026 GMC Sierra 2500 HD Engine Options & Horsepower

There are two formidable engine options for the 2026 Sierra 2500 HD, and either option provides more than enough raw power for you to confidently traverse the streets of Charleston. Both options utilize a heavy-duty Allison® 10-speed automatic transmission to ensure smooth shifting and ideal gear ratios under heavy loads. Take a look at the capabilities of both engines:

Standard 6.6L V8 Gas Engine

• Up to 401 hp
• Up to 464 lb-ft of torque
• Paired with an Allison® 10-speed automatic transmission

Available 6.6L Duramax Turbo-Diesel V8 Engine

• Up to 470 hp
• Up to 975 lb-ft of torque
• Paired with an Allison® 10-speed automatic transmission for maximum diesel engineering efficiency

2026 GMC Sierra 2500 HD Towing & Payload Capacities

How much can the GMC Sierra 2500 HD tow? We’ve listed the maximum towing and payload capacities of the 2026 model below so you can plan your next major haul with absolute precision:

• Maximum Towing Capacity: Up to 22,390 pounds when properly equipped for fifth-wheel or gooseneck configurations
• Maximum Payload Capacity: Up to 4,049 pounds of hauling capability in the cargo bed

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