While turning OD off is what you should do, it is not Tow/Haul mode. All that does is prevent your truck from shifting to Overdrive, then popping out, then in again. Tow/Haul delays shift points.
"Higher shift points to minimize gear changes. It also changes torque converter lock programming."
"Using the tow/ haul mode will also help with slowing the truck and trailer down when descending a hill. If you are in Tow/haul and going down a hill and notice you are picking up speed just tap the brake and the trans will down shift a gear and it will use engine breaking to help maintain speed. Every time you tap the brake it will keep downshifting and if you are using cruise control and the truck and trailer starts to pickup speed going down hill the trans will automatically downshift to try and maintain the set speed. "
Last edited by Ricktwuhk; 06-17-2014 at 06:33 AM.