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
pcaffrey wrote:
Let the computer do its job.
I don't think the manufactures are as dumb as some people like to think they are.
