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:salem 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.
exhaust brake does work without tow haul activated. its just not as aggressive. I use the exhaust brake in everyday driving.
