chugging or balls to the wall is how my 2014 frontier goes. It is a very odd feeling. OD off helps and applying slightly more pedal pressure coming up to an incline also helps. I also have some long inclines, not extremely steep on the way to work. These I alway turn off OD or else it will go 3 to 4 sometimes hit OD then back to 3 and repeat a few times until the ground levels off. If I get up some speed before and turn the OD off I can make it most of the way up the hill in 4th. It might drop down to 3rd once.
Basically what you are describing is exactly how my 2014 behaves. I found it annoying at first but now I click the OD off without even thinking.
Basically what you are describing is exactly how my 2014 behaves. I found it annoying at first but now I click the OD off without even thinking.