8-Speed Automatic with Overdrive, 4WD, Jet Black/Spice Red All-Terrain Leather. 2016 GMC Sierra 1500 SLT 4WD 8-Speed Automatic with Overdrive EcoTec3 5.3L V8 Crimson Red Tintcoat Reviews: * Powerful and efficient engines; improved tech interfaces for 2016; versatile and comfortable interior; superior ride quality on Denali trim. Source: Edmunds Awards: * 2016 KBB.com Brand Image Awards