Revolution Gear and Axle AMC Model 20 Master Overhaul Kit comes with all the necessary parts to re-Bearing your differential and install a new ring and pinion set. Revolution master Overhaul kits come with top quality Timken Bearings and National seals. Along with new Timken Bearings kits include Pinion seal, Pinion Shims, Carrier Shims, Pinion Nut, Gasket or Sealant, Preload shims or Crush sleeve, Ring gear bolts, Gear marking compound and Loctite for the ring gear bolts.