This motor is not putting 420 lbs-ft to the wheels but I bet its a good deal more than that at the wheel. Maybe I'll talk to the folks at Advance Adpater, I know they'll want to sell me one but if they think this application is going to be tooo tough for it I bet they'll not want to warranty it. That would tell me what I need to know. I agree very much with your take on the Ranger and the T19/NP435. I think I'd be spending a lot of time in 3rd over at 45-50 mph. For anyone that's ever used a ranger or similar, do you have to shift both sticks simultaneously to grab a gear or how does that work out? I'm wanting input..
With a aux, until you get good , or if you're in a spot where steering with a knee or elbow isn't a good idea going up you can just grab a whole gear in the main then drop the aux down . Going down you usually are grabbing a handful at a time anyway unless in the hills in which case , do the same way, drop a whole, and then see if you didn't loose too much to be able to grab the split ( when you get real good you'll know ahead if you can go for the half gear on the way down , but if you blow it and you're pulling heavy, you loose two)
Now if you want to watch a master, one of our members over on the big truck board has an old B model Mack with twin sticks, and has a nice movie of it right
here Slightly different shifting requirement with that beast as those old truck were hauling 73,280 pounds with engines that had about the same power as our pickups ( and a heck of a lot less than these new pickups ), so it was all in the gears. The main box has even gear spacing so the brownie is shifted through its range then the main box is shifted and it starts again.
The power range in our engines is much wider than on those old things so that many gears are not generally needed, but a few in between gears would sure come in handy at times.