USA Standard Master Overhaul kits let you finish your install with confidence This kit uses Koyo bearings and races Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve (if applicable), oil baffles and slingers (if applicable) USA Standard Gear manufactures products that are engineered to surpass and exceed OEM specifications and eliminate points of failure through quality engineering, manufacturing, and quality control practices.