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...
Forum Discussion
When I'm tow8ing, mine is always in tow/haul mode. The only time I shift it out is to get an up-shift at speeds that are below the tow/haul upshift parameters. Say a 55 mph speed limit and my up-shift happens at 62.
