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You can shift 3rd to 4th on a steep hill but it is not a good idea because you will loose power/speed and could even start to roll backward and stall the engine. 4th gear is designed for level road driving at higher speeds. 3rd is for stepper hills or getting to sufficient speed so to shift to 4th. 2nd gear is for steeper hills and so on.

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โˆ™ 2015-07-17 17:51:52
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Q: Why can't you downshift into third from fourth gear when going up a steep grade?
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