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...
Forum Discussion
Mbranscum wrote:
OK..so when should the +/- manual shift switch for on the shifter be used?
Mines a 2011 6.0L like your's.
I leave mine in drive with the tow haul mode selected when I have my camper loaded in the truck and let the truck decide when to sift. It will up-shift later when accelerating and down shift sooner when climbing hills that it will when the tow haul mode is not selected.
Selecting the +- seems to only do any good for down shifting when decelerating.
If you select 5th gear in the manual shift mode and the trucks wants 4th gear it will shift into 4th regardless of what you select.
