This Front or Rear Limited Slip Spiral Cut Diff Set provides a pre-assembled unit for your ARRMA vehicleFeatures:Factory assembled and filled with 10k cSt silicone oil for fast and efficient servicing - Tough steel internal gears for long-lasting durability in all conditions - Stainless steel limited slip diff plates installed for limited slip differential action - Strong composite diff case with integrated steel insert for durability - 43T GP4 spiral cut steel main gear for increased durability under extreme loads - Metal Cross Shafts for increased efficiency - Includes rubber shielded bearings for fast and efficient fit to your vehicle - 29mm Diff Case - use 29mm Diff Case spare partsIncludes:1 x Factory Assembled Limited Slip Front or Rear Diff, 29mm Diff Case, GP4 43T Spiral Cut Gear and 10k cSt Silicone OilRequires:To be used with #ARA310979