As @azPaul mentioned above, regarding turning the OD off, not sure I agree with that, as I've tried both it on and off. Now that said, my tt is on the pretty light side, a Forest River 14rb. On the earlier 4sp tranny's, OD off seems like way more work on the 01 than leaving it on. With off, going up rather big grades, I find the rpms rev way up and it's always searching, it's revving, dropping, revving dropping. Leaving the OD alone / on eliminates much of that, in my experience.
Leaving the OD button alone / on allows, for me anyway, way less gear shifting/searching, better foot control of rpms and way less motor roar and butt feeling of stress on the rig. Just a better steady speed and held rpm. Granted, it's definitely slow lane style (either way), but the truck works less from my practical experience.
Below is max loaded weight about 3500 and someone 6'4 can stand upright with a full bath. The driving factor (wife)
Not a towing wiz at all, just observations.
Leaving the OD button alone / on allows, for me anyway, way less gear shifting/searching, better foot control of rpms and way less motor roar and butt feeling of stress on the rig. Just a better steady speed and held rpm. Granted, it's definitely slow lane style (either way), but the truck works less from my practical experience.
Below is max loaded weight about 3500 and someone 6'4 can stand upright with a full bath. The driving factor (wife)
Not a towing wiz at all, just observations.

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