So I'm thinking about getting the 3.36 gears from a 2011 superduty and putting them in the 05 Ex. Its 90% of the time on the highway and running 75 to 80 mph. I think it will improve the mpg, but I'd like to hear what Dave and anyone else thinks.
It will be a little laggy in town, and hard on your tranny. Kinda like running 38's with 3:73.
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