Yokomo Y2-500AA Aluminum ball diff kit for YD-2 series  [Y2-500AA]

That is a ball differential set you need to use for all YD-2 show cars.
The remaining and right differential housings are constructed of aluminum, eventually causing a lightweight finish. While taking advantage of the high traction feature of a ball differential, it offers advantages, like improved throttle response because of its light-weight and enhanced maneuverability by reducing the gyroscopic impact.
in order to minmise used in the aluminum elements, a resin protector is attached to the dogbone tip about the universal shaft, optimizing approval and additional increasing response.