This Aluminum Center Diff Set provides a pre-assembled replacement unit for servicing your vehicle.Features: Factory assembled and filled with 200k cSt silicone oil for fast and efficient servicing Tough steel internal gears and outdrives for long-lasting durability in all conditions Precision machined red anodized aluminum diff case offers increased durability Strong steel diff end cap 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 vehicle Includes:1 x Factory Assembled Center Diff, Aluminum Diff Case, 50T Steel Spur and 200k cSt Silicone Oil