Front Minor Differential Install Kit (MKD30-JK) by Yukon Gear and Axle. Yukon Minimum installation kits are a low cost solution for gear changes in newer vehicles where the bearings can be reused. This kit uses all high quality components to ensure a smooth set up. With inner and outer bearings and races and wheel seal. Yukon Minimum installation kits are a low cost solution for gear changes in newer vehicles where the bearings can be reused. This kit uses all high quality components to ensure a smooth set up.