Hot Racing optional upgrade CNC Metal Differential for Mini XRT vehicles. SeeHardened steel gears to improve durability, FEATURES: - CNC machined and hardened steel gears YOU WILL RECEIVE: - One Assembled Differential Set Front REQUIREMENTS: - Installation following kit manual must replace as a set. - Medium threadlock (blue threadlocking compound) if screws are threaded into metal - Hot Racing SPL10G05 high temp grease recommended for the diff gear. - Use Silicone Diff Fluid for Gear Diffs inside. COMMENTS: It will work with Mini Max that had a center diff or slipper