GMC Sierra 2013 Automatic mileage: 300 KM or more 4WD Wanted Sierra model 2011 - 2012 - 2013 . Condition: reasonable mileage, engine, gearbox, and 4WD are guaranteed. Condition: 5.3 engine, 6-speed gearbox. Mileage not exceeding 300,000. No objection to paint on one, two, or three parts.