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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Your new vehicle came with an owner's manual that fully explains all of the vehicle's features and when and how to use them. You would be very wise to read and understand that manual.
