Duramax and towing a 10600lb 5th wheel
This is a question about the trans. Should I just leave the truck in "D" and go or should I be in manual mode and restrict it to 5th gear? The truck seems to be laboring on slight uphill grades but wi...
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Leave it in D and use the tow haul mode. I pull a 14600 lb fifth wheel with the cruise set at 62 and let the truck do what it does best, pull. The only time I turn the tow haul mode off is if I'm going down a hill and then need to shoot back up another one. In tow haul with cruise on she'll down shift to keep speed. Just let your truck work, she's a towing beast.
