2026 Automatic Gasoline AT4 2026 Automatic transmission Gasoline 4x4 GMC AT4 Specifications __ 8-cylinder 5.3L engine Leather Seat cooling 20-inch rims Electric seat control Navigation screen Cruise control Power windows Projector 10-speed automatic transmission Bluetooth Keyless start Wireless charger Rear camera Front and rear sensors Traction control Steering wheel control Electric mirror folding 18-inch rims Smart entry Smart start Auto-dimming mirror