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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Love the tow /haul Allison .
I do shift to 3rd and sometimes 2nd manually for compression braking .
just use the lever on the steering column .
17.5 to 1 compression works !
I do shift to 3rd and sometimes 2nd manually for compression braking .
just use the lever on the steering column .
17.5 to 1 compression works !
