Dark Slate Metallic 2018 GMC Sierra 1500 SLE 4WD 6-Speed Automatic Electronic with Overdrive EcoTec3 5.3L V8 THIS VEHICLE INCLUDES THE FOLLOWING FEATURES AND OPTIONS: Preferred Equipment Group 3SA (150 Amp Alternator, 2-Speed Active Electronic AutoTrac Transfer Case, 4.2"... via HomeNet, Inc.