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...
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I would recommend you use the T/H mode all the time you tow and, as well, simply push the button for the engine braking system to operate. The engine braking system will help a lot when going down mountain passes, or really steep hills, and will allow you to not use the brakes as much. We have a 2012 GMC 2500HD D/A combo and the T/H and engine brake system work great when we are pulling our FW and boat, with a total combined weight of around 12,000.
