About us: This TUNTUN locking hubs assembly set was manufacturer by a professional factory in China, which have been specialized in automobile parts for many year. All products have been exported to Global Market which was made of High Quality Material,ensuring a long service life. OEM Part Number: 600-220 BC3Z3B396B BC3Z-3B396-B Fits for: For 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Ford F250 F350 F450 F550 Super Duty. Function: Over time, mud, rust, or worn parts inside the hub will prevent the mechanism from sliding into and lock the hub, causing failure to lock the hub, and further causing symptoms such as increased fuel consumption, noise on the highway, and increased front tire wear. Replace with new locking wheels to provide you with higher AWD fuel economy when unlocked, provide you with better torque power when locked, and prevent you from being bothered by the front humming noise, and bring you good driving again sense of experience Features: Easy installation; Direct replacement and Perfect fit; Our oil cleaner and cap assembly is a perfect replacement, made of high quality and durable Material which is wear-resistant and corrosion-resistant, ensuring high performance to extend long service life. Our Warranty: Lifetime warranty service. All products have been 100% tested before delivery and guarantee to offer true worry-free shopping experience. Wishing you a happy online shopping! :-)