Aluminum Ball differential kit can be used with all YD-2 series cars.

The right and left diff joints are made of lightweight aluminum, achieving 8.3g, which is about 1/3 weight of the steel diff joints that have been released (22.7g on L/R).
Throttle response is improved by drastically reducing the weight of the drive unit, and it is possible to further improve exercise performance by reducing the gyro effect. High traction peculiar to the ball diff is pulled out further, the approach speed to the corner is increased, and make advantage in the tournament.