Just want to run this by some of you, at the present time when I climb a (Hill or Mountain) I let the Allison do the changing or down shift as needed, if it don't down shift at 1400 RPM I will down sh...
I personally prefer to manage the gears myself in the hills. I find that by the time the tranny downshifts on its own, I'm behind the curve. If I see a steep hill coming I downshift before the climb starts and get on the throttle to pick up speed before the hill hits its steep grade. On the really ugly grades here out West I just downshift and grind them out. Sometimes it is a slow haul in 3rd or 4th.