2026 GMC Sierra 2500 HD AT4 in Kansas City

Jul 27, 2026

2026 GMC Sierra 2500 HD AT4 on an off-road trail

The 2026 GMC Sierra 2500 HD AT4 is engineered for drivers who demand serious capability without sacrificing comfort or refinement. Built on GMC’s heavy-duty platform, the AT4 trim brings factory off-road upgrades to a truck that can already handle demanding towing and hauling tasks. At Cable Dahmer Buick GMC of Kansas City, we want to give you a clear look at what this truck offers.

Shop GMC Sierra 2500 HD AT4

Powertrain Options and Performance

The 2026 Sierra 2500 HD AT4 offers two distinct engine options built for heavy-duty work. The standard 6.6L V8 gas engine delivers reliable power for everyday hauling and towing, while the available 6.6L Duramax Turbo-Diesel produces massive torque output for the most demanding jobs. The diesel pairs with a heavy-duty Allison 10-speed automatic transmission, giving it a significant advantage when pulling large loads over long distances.

Engine Option	Horsepower	Torque	Transmission
6.6L V8 Gas (Standard)	401 hp	464 lb-ft	6-speed automatic
6.6L Duramax Turbo-Diesel (Available)	470 hp	975 lb-ft	Allison 10-speed automatic

18,500 lbs. Max Towing Capacity

401 hp Gas Engine Output

470 hp Diesel Engine Output

975 lb-ft Diesel Torque

Dedicated Off-Road Hardware

The AT4 trim is purpose-built for drivers who take their truck beyond the pavement. GMC equips the Sierra 2500 HD AT4 with factory-installed off-road hardware so you do not have to rely on aftermarket modifications to get real trail capability. The additional ground clearance and suspension upgrades translate to genuine confidence on rough terrain, unpaved job sites, and backcountry trails.

Factory-installed 2-inch suspension lift
Off-road suspension with Rancho monotube shocks
Underbody skid plates for vital component protection
Two-speed Autotrac transfer case
Hill Descent Control for safer travel down steep inclines

2026 GMC Sierra 2500 HD AT4 navigating off-road terrain showing suspension lift and skid plates

Interior Comfort and Advanced Technology

Inside, the AT4 features an exclusive Jet Black interior with Kalahari accents and standard heated and ventilated perforated leather front seats. The dashboard delivers over 40 inches of combined digital display space, and Google Built-in compatibility comes standard for seamless access to navigation, music, and apps directly from the center screen.

Infotainment Screen 13.4-inch diagonal touchscreen

Driver Info Center 12.3-inch digital display

Combined Display Space Over 40 inches total

Voice & Apps Google Built-in standard

Front Seats Heated & ventilated perforated leather

Interior Theme Jet Black with Kalahari accents

GMC MultiPro Tailgate open on the 2026 Sierra 2500 HD AT4 at a job site

Utility and Trailering Features

The 2026 Sierra 2500 HD AT4 comes equipped with the GMC MultiPro Tailgate — a six-function tailgate that can be configured as a step, a load stop, or a standing workstation. It makes loading and unloading cargo significantly easier, especially when working solo on a job site or trail.

For frequent towers, the available ProGrade Trailering System adds useful camera views that help you maneuver tight spaces and connect trailers with confidence. These integrated features take much of the guesswork out of hauling heavy equipment around the Kansas City area, whether you are heading to a work site or pulling a fifth wheel.

Explore the 2026 GMC Sierra 2500 HD AT4 in Kansas City

The Sierra 2500 HD AT4 delivers heavy-duty capability, factory off-road hardware, and a refined interior in one well-rounded package. Our team at Cable Dahmer Buick GMC of Kansas City is ready to help you find your next heavy-duty pickup — shop online or stop by to schedule a test drive.

Shop GMC Sierra 2500 HD AT4

Posted in Uncategorized | No Comments »