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I wouldn't go with anything lower than 3:73. Yah, all these truck have gobs of tq and hp. All the ratios they match them with will get you down the road. But, to keep your engine in the "sweet" spot(rpm wise), you need to match up the ratio with the weight you expect to pull. My truck would've been ok with the 3:73's but it would've been close to it's max tow rating(you gotta use the gross veh weight rating of the trailer, not the actual weight as it sits on the dealers lot), and a lot of guys pull my weight(my 3665 has a gvwr of 15,500, I think)with 3:73's and have no problems. I have the 4:10's. It gives me an extra 1000lbs cushion before maxing out and extra piece of mind. I don't mind the small penalty in fuel milage. I get 16 mpg hwy empty and 9-11 mpg loaded with the Montana and whatever goodies we can cram in the truck and trailer. It's really peanuts compared to the overall cost of the rv + truck + other toys for it all.
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