Without the code on your sticker, I can’t tell you precisely what you have in your truck, but there were five different ratios that came standard in the 2014 F-150: the 3.15, 3.31, 3.55, 3.73, and 4.10. They could be either open, limited-slip, or e-locker.
Once you find the code on your sticker, you can look up an axle code chart online and get your exact information.