I have that same manual +/- shift function on my F350. But like you I have not found a use for it.
I was hunting last weekend with lots of rain and mud. Difficult getting to/from cabin thru the pasture but even in that I could see no use for the manual function. With all tires spinning in the mud transmission was not up/down shifting. Just maintaining a constant pull.
Certainly no need for it on the highway.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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