Yukon   Hardcore Locking Hubs feature chromoly internals and all-steel construction   for ultimate durability and strength. These hubs won't disengage under high   torque applications and default to the locked position in use. Engagement   comes from just a 1/3 turn of the all-steel, low-profile bezel, ensuring   quick changes between two-wheel and four-wheel drive. Yukon Hardcore locking   hubs are not only great looking, but feature a low-profile design to minimize   impact with obstacles, as well as a proprietary coating on the locking gears   for decreased friction and a long service life. Designed to fit Ford Dana 60   front axles (1999-2004 F-250 and F-350 Super Duty), this locking hub is a   heavy-duty upgrade for Ford Dana 60's.