2025 GMC SIERRA 3500 HD AT4 4x4 SRW CREW CAB, LONG BED VEHICLE SPECIFICATIONS 1. Engine & Powertrain • Engine: 6.6L Duramax Turbo-Diesel V8 • Horsepower: 470 hp @ 2,800 rpm • Torque: 975 lb-ft @ 1,600 rpm • Transmission: Allison 10-speed automatic • Drivetrain: 4x4 AT4 with dual-amp alternators, exhaust brake, optional hill descent control, off-road suspension 2. Towing, Payload & Dimensions • GVWR: ~12,250 lb • Payload: ~3,083 lb • Towing Capacity: ~36,000 lb with gooseneck/fifth wheel towing • Conventional Tow: ~20,000 lb 3. Exterior Dimensions • Length: 266.7 in • Width (without mirrors): 81.8 in • Height: 80.6 in • Wheelbase: 172 in • Ground clearance: ~11.1" 4. Interior Seating • Crew Cab configuration seats up to 6 passengers 5. Convenience & Tech • 13.4" premium touchscreen with Google built-in, Apple Carplay & Android Auto, Wi-Fi hotspot • Automatic Emergency Braking • StabiliTrak, electronic stability control system with traction control • Hill Descent Control • Front and Rear Park Assist • HD Surround Vision and Bed View Camera • Hitch Guidance and Hitch View • Rear Cross Traffic Alert, Trailer Side Blind Zone Alert, and Lane Departure Warning • Forward Collision Alert and Front Pedestrian Braking
