This is the Yukon 10.25" and 10.5" Ford carrier installation kit. (Part number CK F10.25) Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. Yukon Carrier Installation Kits are a convenient and low-cost solution for carrier changes in cases where one is upgrading to a positraction limited slip differential, a mechanical locker, or an air operated locker. These kits contain carrier bearings and races and a carrier shim kit.