GMC Sierra SLE 2026 Automatic Gasoline 4WD Standard Engine: 5.3L V8 engine, producing 355 horsepower and 383 lb-ft of torque. Transmission: 10-speed automatic. Interior and Technology: Screens: Standard 13.4-inch central touchscreen, and a 12.3-inch digital driver information center screen. Seats: Seats. Audio and Connectivity: Supports OnStar connectivity and equipped with a built-in Wi-Fi package. Exterior Design and Practical Features: Exterior Appearance: Monochromatic design featuring a bright chrome grille and body-colored bumpers. Wheels: Available aluminum wheels with distinctive designs and sizes up to 18 inches. Tailgate: Features a class-leading cargo capacity, with the option to add the MultiPro tailgate.