All Balls Differential Kits Rear are designed to deliver the smoothest, most efficient operation with machine specific bearings, seals, and components needed to rebuild your rear differential. Once your diff is back together, it will be in better shape than ever since all the components in these kits are sourced from the top manufacturers in the industry. Every component is up to OEM spec and installs just like stock, giving you dependable operation you can count on to last.