Duramax, Allison, Tow-Haul mode advice
We traded the '05 Tahoe in on a new 2013 GMC Sierra 2500HD crew cab with the Durmax diesel, Allison transmission, and HD tow package. We tow a Surveyor Sport 220 that weighs in about 4,400# dry with a...
Forum Discussion
sayoung wrote:same here but I am sitting at 20k combined while towing, and yes I do have a exhaust brake via..EFI livesalem wrote:
I put mine in TH when I'm sitting in my driveway getting ready to take off and leave it in till I unhook.
Same here on my 12 but I am towing close to 14k.
Exhaust brake only works when in tow/haul.
