Want to upgrade my rear end to a 3.73 or 4.10 posi from the 331 open
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You will have to get your gears from FoMoCo. Nobody is making aftermarket gears for 2011 and up F150's yet. The shaft on the pinion gear is different than on 2010 and below F150s. It's not a big deal because you can get them through Ford. But it will be more expensive than Yukons or other aftermarket gears. There is a guy on another forum with 40" tires that had some 5.13 gears custom made. I'm sure that wasn't cheap. On the bright side you only need 1 set of gears for your 4x2 so that will make it more affordable.
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If you question the shop that much, go some where else. But you can pop the diff cover and check the how the gears mesh. I honestly don't know anything about setting up gears, so can't help you past that.
Last edited by 06yz250f; 02-18-2013 at 01:56 PM.