Can't you just use the manual shift button to move it up or down as needed. Have not any issue with my 2018 not automatically shifting up or down but occasionally do use the manual shift button to go from 6 to 5 if I want to pass someone without putting my foot into it.
Shift button works even in Drive and not in Manual mode.
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Jim & Pat / '18 Montana 3811MS / '18 Ford F350SD / Pullrite ISR2300 SuperGlide
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