Hi have recently bought a 2000 model Grand Cheroke with Auto Box and Quadra Trac ll.All runs very well but I niticed in the snow this wek whilst pulling away on steep slope the rear wheels were slipping but front wheels did not seem to have any drive to them.When i selected 4Low all 4 wheels turned and i managed to pull away with no problem.Surely quadra trac system should have provided drive to front wheels, if so does anyone know what the problem may be.I think oil level in trasfer box is ok and full at least is making no noise .