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I also have a Dodge, mine is a 2005, and a 4 speed automatic, not the 6 speed. First, the 6th gear is operating with the torque converter locked, you will not cause heat problems towing in high gear. On mine I tow in overdrive, 4th gear except in hill type areas, when your in overdrive with the exhaust brake turned on and want to slow down, just hit the tow haul button, it will drop into 5th, and stay there, the exhaust brakes work best at a little higher rpm, 2000-2500 with the exhaust brake it makes slowing down very nice, when your on those rolling hills, and it wants to down shift to 5th, just run it tow haul and leave it there. The Dodge, as do all Diesels, run there best towing at the max torque, I don't know what your 6.7 is listed at, but my 5.9 is 1650 rpm's, I find if I am at or just above that number the towing works the best, I hope this helps, Ron
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