6-Speed Automatic Electronic with Overdrive and 4WD. Sleek Black! Controls are easy on the eyes and friendly on the fingers! If you've been thirsting for the perfect 2014 GMC Sierra 1500, then stop your search right here. This great truck is the catch that is sure to impress you with its fresh, never-smoked-in smell. Have one less thing on your mind with this trouble-free Sierra 1500. It is nicely equipped with features such as 4WD and 6-Speed Automatic Electronic with Overdrive.