Message: I did not notice to much change in MPG. As Long as you do speedo correction you prolly wont see much of a difference. I get 15 - 16 MPG per gallon mostly freeway driving with limited city driving with my V-6 2000.
Some guys go with the speedo recalibration units. There's a few companies that make them, and some of the "power programmer" computer things you can buy will make a correction for you as well. I decided to take my Dak to the Dodge dealer and have the shop techs plug it in and recalibrate the speedo. It only cost $30 and has worked like a champ.
If you plan on changing tires sizes often, you might think about whether or not purchasing a calibration unit would be more cost-effective for you. For me, I plan on staying ith 33" tires for the life of the truck, so I decided that $30 was better in my case.
Message: dude all u really need to do is regear. i know it might be a lil more expensive but it will improve the trucks performace on and off road and still give u better gas mileage. I would say go with 4.10's
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