If it is a V8 you are in 4x4 all the time, nothing else to do. Were the tires spinning in deep snow? If so the traction controll was trying to stop the spinning tires. Next time try locking the center diff and see what happens. With it locked you can hit the gas hardand spin the tires without the traction control kicking in. Just be sure to unlock the center diff when you are back on dry pavement.