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 also like TH on because the convertor is locked above 2nd, but since the lock-up box is going in I will not have to drive around town with it on , because you never know when someone wants a race...lol
