This is the Complete Planetary Gear Differential With Steel Ring Gear for the Traxxas Bandit Stampede and Rustler.Metal gear shafts.Metal and plastic main differential. Includes: Main differential with steel ring gear.Planetary gears and shafts.Sun gears and shafts.Silicone grease. Requires: Installation on the vehicle. Comments: For main differential w/ steel ring - TRAC6380.Planet gear shafts - TRAC6382.Silicon grease - TRAC6037.