Your 10.5" rear axle deserves some love! Whether you stepped up to bigger wheels and tires and need a new gear ratio or you're looking for an automatic locker to improve off-road traction and performance, you'll find peace of mind in knowing that our gears and differential upgrades are sourced from the most reputable manufacturers in the business. And if you've got off-road performance on the mind, check out our complete selection of 2011-2016 Super Duty Lift Kits! Ford Super Duty Fitments: 2011, 2012, 2013, 2014, 2015, 2016 Ford F250 & F350 Submodel Fitments: FX4, King Ranch, Platinum, Lariat, XLT, XL Some Exceptions apply, please see individual product pages for specific fitments.