Rear Differential Pinion Install Kit (PKF9-HDA) by Yukon Gear and Axle. Yukon Pinion installation kits are a terrific solution for gear installation on lower mileage vehicles where the carrier bearings and races can be reused. This kit uses Timken bearings and races along with a high quality pinion seal and small parts. Yukon does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your pinion gear. With inner and outer bearings and races and wheel seal. Yukon Pinion installation kits are a terrific solution for gear installation on lower mileage vehicles where the carrier bearings and races can be reused. This kit uses Timken bearings and races along with high quality seals and small parts. Yukon does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your gear set.