Hmm, I don't know if an aftermarket shift point recalibration tool is available. I'd guess there is, given the popularity of Mustangs and the interest in performance modifications.
Again, though, if you did swap the axle you'd be guaranteed a nice highway FE boost, and even without a recalibration you'd at worst stay about even in around town driving. I'd go for it if you did at least 1/3 of your driving on the highway.
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