This Center Diff Set provides a pre-assembled replacement unit for servicing your vehicle.Features:Factory assembled and filled with 100k cSt silicone oil for fast and efficient servicing - Tough steel internal gears for long-lasting durability in all conditions - Strong composite diff case -  50T steel spur gear for increased durability under extreme loads - Metal Cross Shafts and inserts for increased efficiency of fit and long-lasting durability - Includes bearings for fast and efficient fit to your vehicleIncludes:1 x Factory Assembled Center Diff, 50T Steel Spur and 100k cSt Silicone Oil