Hi i have a 1997 F350 crew cab 7.3 powerstroke with a destroked Allison stand alone setup. The Allison works fine but will not go into tow haul mode never has, have sent computer back and told all working fine is a pian as i have converted it 6 speed and have to keep changing computer to tow is there anything i can check the light on the column comes on but no shift and still goes in sixth, my other problem is i live in Australia any help would be appreciated