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    Help with 6.6 Duramax.....

    My dad just bought a 3/4 ton 2500 with a 6.6 Duramax and a 6 speed Allison tranny. He wants to buy a programmer and would like to know which one is the best. He will mostly tow a 30' travel trailor with it. He was wondering about a programmer called the "Workhorse." Any help would be greatly...
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