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We just got back from Colorado where we were in my wife's 2016 Acura RDX, it to has the same engine and the 6 speed trans, at high altitude 8000 to 10000 feet above sea level the trans would down shift in the mountains when needed, I think it was caused by less air and the computer telling to down shift for more power, its the way its always been. I don't have my 2017 Ridgeline yet (on order), but I would expect it to perform the same under like conditions. My 2008 Ridgeline when the down shifting started, I just took it out of overdrive. I live at 650 above sea level and for small hills the trans does not shift in and out of gear on both my vehicles, I have pulled a small trailer with motorcycles with the 2008 RL and you can get downshifting at times, but your manual says put it in 3rd gear where the overdrive will not kick in and out, takes care of that problem. I would also think that the 2WD and the AWD are setup somewhat different and could perform different under towing conditions.
trainman
trainman