Calling all Toyota T100 and Tacoma owners and mechanics doing a differential overhaul! This USA Standard Gear Master Rebuild Kit has (almost) everything you need to do the job right. It's specifically designed for Toyota T100 and Tacoma models that did NOT come with a factory electronic locking differential. The heart of the kit is the bearing set – it includes high-quality Koyo brand pinion bearings and races, as well as carrier bearings and races. Koyo is a trusted OEM supplier, so you know they're good. Beyond the bearings, you get a ton of essential small parts: a new pinion seal, a complete shim kit for setting your backlash and preload precisely, new ring gear bolts, a new pinion nut, a crush sleeve (if your diff uses one), thread locking compound, marking compound with a brush for setting gear contact patterns, and usually some RTV silicone. This is a comprehensive kit that lets you finish your gear install or complete differential rebuild with confidence, knowing you have all the critical wear items replaced. Just make sure your specific truck doesn't have the factory locker before ordering. A must-have for any serious differential repair.