GMC Sierra Z71 2015 Automatic Gasoline mileage: 239 KM 4WD 2015 Sierra for sale Transmission, engine, chassis are guaranteed. It has a Canadian 40,000 BTU transmission cooler, Bilstein shocks, and I just installed a new bed cover and a set of new tires. The interior still has the original dealership plastic wrap. The vehicle has a light dent on the side with no paint, and the rest of the vehicle is like new from the dealership. Asking price is 73,000. No trades accepted.