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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My Allison doesn't have a tow haul mode so I will drop it down gear by gear depending on how steep and long the grade is. I pull a 15000 lb 5th wheel and on 6% grades I'm often in second gear under 30MPH with the go pedal pushed to the floor. This seems to be a good place for the engine/trans, very smooth, no lugging and temps don't climb up.
