2002 4wd dodge durango?

well in my durango i belive its 4wd and there is the 4wd hi, 4wd lo, and just 4wd and i know the 4wd lo is for high touqe like pulling a boat but wht do i wana use the other ones for i just keep it in the 4wd option all the time even when there is snow. when i do a burnout in the snow and dounuts do i wana have it in the 4wd option and just on regular dry pavement how can i do a burnout even though its a auto and 4wd? thx!