GMC Sierra 2500HD 2012 Automatic Gasoline mileage: 247 KM 4WD Peace, mercy, and blessings of God be upon you. Sierra 2012 HD 2500 4x4. It has King shocks and a transmission cooler. I've had the car for a little over a year. When I bought it, I had it inspected, and they told me it only had rear fender repairs. I don't recall what they said about the engine, but I haven't noticed any issues with the car. It's solid and very excellent. I've traveled with it, gone places, and returned without any problems, praise be to God. There are some minor notes for serious buyers.