Small world, I have a Nissan Frontier. It is a 2010 with 4WD. A 3.5 liter six cylinder. I live in the NC mountains. Got a long steep hill about a mile long I have to drive every time I go into town. A real brake fryer. I always downshift into low, run it at about 40 mph. I have run that hill at least 600 times in this Nissan and no transmission problems.