Originally Posted by kdanner
3.31 seems to work best up until you trap 126mph or so, then you either need a 30" tire or go back to stock 3.15.
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Mine came factory with 3.31s, and my brothers came with 3.55s... I've also driven a 2012 with factory 4.10s...
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'13 5.0 in deep impact blue, "The Blue Goose"
A few mods, just a daily.
94 F150 302
New project, thinking built, procharger, powerglide, tubbed, super sleeper 
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