the best way to do this is go out and drive a new 08 with the 6.7 and the 6 sp auto you will love the feel of it . I sure do
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2008 quadcab long bed Patriot Blue 2500 6.7 with 6 sp auto all the bell's and goodies
Sold 1985 crewcab longbed 4x4 with 93 running gear :thumbsup