Install 4 10 gears or deeper. I would not use Juice or Edge for towing
solution here because engine strain aside, it adds transmission strain
too and that is not the strongest trany stock but it should hold up
well behind a non chipped engine. Chipping it will overload tranny.  A
4.10 should help a lot and if you tow in mountains a lot you might
even consider a 4.56. Your engine is turbo charged but it still sees
some power loss at high altitude and deeper gears would help a lot
here. When you tow a big load with a automatic you should have 4.10
anyway by default. Deep gears would help you all the way across the
board too, starting out and backing up as well and will likely improve
MPG towing as well. Your truck has a AAM 11.5 rear axle the same as GM
uses and aftermarket gears for it are widely avaible (GM has used it
since 2001 and Dodge since 2003) so you do not have to buy the gears
at a dealer and get skinned on them as they will likely be 700 or more
at dealer for rear axle and less than 300 for quality after market
ones. If it is a 4x4 you need to change front axle gears too and it
also uses GM 9.25 IFS gear in front in its AAM  9.25 solid front axle
and gears can be had for it for about 200 buck or less. You could buy
gears and shop around for best instalation price. Just think of gears
as using a newer bigger longer pry bar to move same load rather than
trying to pull even harder on the same small pry bar.
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TheSnoMan.com

please see http://inlinediesel.com/forum/topic.asp?TOPIC_ID=617 and give me
your feedback and advice.
thanks,