Grade shifting in Tow/Haul mode is supposed to save your truck and trailer brakes. Along with giving you confidence towing down hill and holding your engine RPM's for more power uphill. The new 10-speed transmissions do have you go faster uphill, but many of them Suck going down hill where you need help controlling your rig. Part one was about Ram transmission rumors about Allison transmissions. This video analyze what Ford and GM are doing for grade shifting.