The 2025 GMC Sierra 1500 AT4 is a versatile full-size pickup truck designed to balance capability with comfort. At its heart, it features a Duramax 3.0L Diesel Turbo inline-six engine that delivers 305 horsepower and 495 lb-ft of torque, providing st...
2024 GMC Sierra 1500 AT4 Factory Features (EcoTec3 6.2L V8, 420 hp / 460 lb-ft)Powertrain and driveline- EcoTec3 6.2L V8 producing 420 horsepower and 460 lb-ft of torque, factory-paired with a 10-speed automatic transmission for smooth, responsive sh...