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I can remember a few years ago when we were in Az. and going down the big grade heading for Sedona. Those who have been out that way know the road I mean. The rear of the coach is almost touching the front of the truck. Anyway, the sign said use a lower gear. It was a 7 percent grade. I touched the brake, the truck automatically downshifted and held that gear. I touched the brake again and the truck started to downshift all the way to the bottom of the hill. I suppose if I hadn't touched the gas to get going again at the bottom the truck would have probably kept downshifting to a stop. Hope that helps answer your question.
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