Okay, Who has them? What are your opinions? What gears are you running with it? How is your mpg?
I'm trying to set my truck up to be better on fuel. So I'm looking for ways to do it, before I throw too much money out the window.

 

to tell you the truth . . .you would have to rack up A LOT of miles before you would see any returns from an overdrive gear set. these things run around 3K. I dont have one, however I have thought about getting one from time to time since I have 4.10's behind my NV5600.

if you have the money I would say go for it, but you wont recoup you money in fuel savings for a long time.