SLT 2012 Used Automatic Gasoline 4WD Peace, mercy, and blessings of God be upon you. I am offering a GMC Sierra, model 2012. Front end only repainted. Engine maintained by the first owner. Remaining original parts: chassis, double transmission, original gearbox. Note: There is a problem with the gearbox's electrical system. If I put it in manual mode, it drives. If I put it in drive mode, it doesn't move. One person says it's a sensor, another says it needs wiring repair. I don't have time for repairs. Mileage: 430