Power through any challenge with the 2026 GMC Sierra 3500HD AT4 Crew Cab 4WD — a diesel powerhouse built for rugged performance, advanced safety, and uncompromising comfort.

Designed for drivers who demand strength and reliability, the Sierra 3500HD is equipped with a Duramax 6.6L Turbo-Diesel V8 engine delivering an impressive 470 horsepower and a massive 975 lb-ft of torque. This robust powertrain, paired with a 10-speed automatic transmission and locking limited-slip differential, ensures confident handling on tough terrains and heavy towing tasks. The 4x4 drivetrain, combined with integrated tow hooks and a bed liner, makes this truck ready for any job or adventure.

Inside, premium leather bucket seats with heating, cooling, and power adjustments—including lumbar support and memory settings—offer exceptional comfort during long hauls. The crew cab provides spacious seating with heated rear seats and a pass-through rear bench, perfect for work crews or family outings. Advanced driver-assist technologies such as adaptive cruise control, blind spot monitoring, lane departure warning, and an aerial view display system enhance safety and awareness on the road. Practical features like an integrated tailgate step, running boards, and power folding heated mirrors add convenience to every drive.

Finished in sleek Onyx Black, the Sierra 3500HD AT4 blends rugged capability with refined style, making it the ideal choice for those who work hard and expect more from their truck.