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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.

thanks
 

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It should help MPG some.

Discuss this with your favorite automatic transmission guy and see what he says.
 
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