So I have an 03 3500 ram dually, are these built stock with tow mode? Because when I hit button on column shifter it only goes to O/D off. My buddy has 06 2500 and his column shifter button has 2 modes, 1)”tow /haul” and 2) O/D off. His has 3:73 and mine is a 4:10. So do I not have the tow...