Clean CARFAX. 2020 GMC Sierra 1500 AT4Preferred Equipment Group 4SB,3.23 Rear Axle Ratio,Heavy-Duty Rear Locking Differential,18" x 8.5" Machined Aluminum Wheels,Perforated Leather-Appointed Front Seat Trim,10-Way Power Driver Seat Adjuster w/Lumbar,...