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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Manual mode for GM is more like top gear range limit. You cannot force the trans to hold a taller gear than computer wants. If you don't want it to downshift, let off the accel pedal.
