I already drive it like that quite often as I have a few hills to negotiate in my area. The problem is that the transmission likes to jump to 5th once you shift from D3 to D, and often "hunts" between 4th and 5th going up or downhill at speeds around the 80-100 kph range. I usually just leave it in 3rd going uphill, but when I am going downhill I would like to be able to hold it in 4th.
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