6-Speed Automatic Electronic with Overdrive and 4WD. Consider the interior your very own rest stop. Make a mad dash for it. Your quest for a gently used truck is over. This charming 2014 GMC Sierra 1500 has only had one previous owner, with a great track record and a long life ahead of it. The pin-you-to-your-seat performance of this wonderful Sierra 1500 will make it a favorite among our more passionate buyers.