2017 GMC 6.0 Vortec - Manual Shifting?
I notice when I am towing my RV, my truck seems to try and down shift sometimes when climbing a hill before it should. Do any of you guys manually shift to get more power or save gas in these situalt...
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You can use the toggle switch to change gears when it's in the M mode. I drop the gear manually on mine prior any large hill.
