Good morning everybody. I need some help with my commander 2007. I have this jeep since 2008 and it is 4x4 3.7. I have no idea how is works specialist with the 4x4. I was washing some videos about the commanders. I have no idea what my commander have in this QD1 or 2 or QT 1 OR 2. I have never try the commander to use the 4x4 I have no idea how it works. I live in Puerto Rico so it is and Island with a lot of mountain and hills. so in summer I was driving by the mountain and I have to go up in a inclined hill and it was great going up. but at the time that I have to go down to the hill. I put me shift in 1 and the commander was going fast. I wan to know what I did run.