Tamiya Hop-Up Options 53863 DT-02 Ball Differential SetUsed in place of kit standard gear differential, this ball differential gives a limited slip diff effect to ensure that the car retains traction, even if one of the driven wheels is not in contact with the surface. The differential can be adjusted while still attached to the model. Compatible Chassis DT 03 and DT 02 Chassis *Use with Item 53791 DF 02 Assembly Universal Shaft.