I was trying to back up a friends driveway today and got my right rear tire over in the gravel. The left rear was on concrete. I tried to keep going and the right rear started digging it's way to china. I could hear the abs unit ratcheting and the computer was pulling engine power. Is this the situation that you would push the auto LSD button and if so what would happen? Would the abs unit clamp down on the spinning tire so the other one would pull me up the hill? I ended up pulling forward and getting both on the concrete. After I got up the hill it dawned on me that I could have just thrown it in 4WD for a few feet. This was in my brand new and I mean "brand new" (47 miles) 2006 DC limited Tundra.