Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. (Part number CK F8.8) 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.