2026 GMC Sierra 3500HD AT4

Experience the power and capability of the 2026 GMC Sierra 3500HD AT4, a diesel-driven, 4x4 crew cab pickup designed for demanding work and rugged adventures.

This Sierra 3500HD is equipped with a Duramax 6.6L turbo-diesel V8 engine delivering an impressive 470 horsepower and 975 lb-ft of torque, paired with a smooth 10-speed automatic transmission. Its 4-wheel drive system includes a locking limited-slip differential, ensuring superior traction and control on any terrain. The truck features a gooseneck and 5th wheel prep package, complete with a hitch platform and bed-mounted 7-pin trailer harness, making it ideal for heavy towing needs.

Inside, the AT4 Premium Plus Package enhances comfort and convenience with leather bucket seats that are both heated and cooled, along with power-adjustable driver and passenger seats featuring lumbar support and memory settings. The technology package adds an aerial view display system, adaptive cruise control, and an advanced safety suite including blind spot monitoring, lane departure warning, and front collision mitigation.

Exterior features such as body-colour wheel arch mouldings, running boards, an integrated tailgate step, and a bed liner provide durability and style. Practical touches like heated mirrors, fog lamps, and tow hooks complete this robust workhorse built for those who demand strength and sophistication in one package.