The Master Rebuild Kit comes complete with everything you'll need to rebuild the center section of your differential. These kits include the following, as needed per application: pinion and carrier bearings, pinion seal, pinion shims, pinion nut, crush sleeve or depth shims, ring gear bolts (most applications), o-ring, gear marking compound & brush, Loctite, cover gasket or silicone, carrier or super shims, slingers & baffle, and installation instructions.