TwinStick wrote:Can the 2016, 2017's be shifted "manually" ? Or is there just a "D" for drive ? Can they be held in a gear when climbing a long hill like Eisenhower Pass ? So they don't keep upshifting & downshifting constantly, like my 04' Ram 2500 did ?
It will still shift down - just wont go to a higher gear above your "+" setting. (Twin doesn't use 5th or 6th)

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He's saying that the +/- button only lets you limit the highest gear available to the transmission. If you have it set on 4, the truck can still downshift as it deems necessary.
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So, then the answer to my question is NO. It will still downshift at IT'S discretion & upshift (as long as it don't go past the set + gear) as well. IMHO, that sucks. I towed in 4th & 5th mostly with our old 10,500 lb camper. This new 3500 lb one, I can even use 6th when towing.
I don't think it's too much to ask to be able to keep it in a certain gear, regardless of rpm. I mean they DO HAVE rev limiters on the engine anyways. The Hemi makes its best power above 4000 rpms. Mine sings pretty damn good @ 5500 rpms. That was it's happy spot when pulling hills with our 10,500 lb Toy Hauler.