Our 2026 GMC Sierra 1500 AT4 Crew Cab 4X4 in Onyx Black delivers diesel-powered strength, premium off-road capability, and bold AT4 design built to push through extreme challenges. Motivated by a TurboCharged 3.0 Litre DuraMax Diesel 6 Cylinder serving up 305hp and 495lb-ft of torque to a 10 Speed Automatic transmission. A 2-inch lift, a 2-speed transfer case, and an auto-locking rear differential help dominate difficult terrain, and this Four Wheel Drive truck scores approximately 8.7L/100km on the highway. Our Sierra shows off rugged style with LED lighting, red recovery hooks, a MultiPro tailgate, robust skid plates, perimeter lighting, sunroof, and bold alloy wheels. AT4 comfort surrounds you in our cabin with heated and ventilated leather power front and heated rear seats, a heated leather steering wheel, dual-zone automatic climate control, remote start, and keyless open with pushbutton ignition. Modern technologies for mobile connections include a 13.4-inch touchscreen and a 12.3-inch driver display with Google Built-In, wireless charging, WiFi compatibility, wireless Android Auto®/Apple CarPlay®, Bluetooth®, voice control, and Bose audio. Drive confidently, knowing GMC's smart safety systems include adaptive cruise control, front/rear automatic braking, HD surround vision, hill descent control, trailer blind-spot monitoring, lane-keeping assistance, trailer-sway control, and more. Crafted to exceed expectations, our Sierra 1500 AT4 is an excellent choice! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Towards Ownership! Serving the Westman area for decades, our award-winning dealership and our professional sales staff are here to make your auto shopping experience hassle-free.