DP-series Ball Differential Front Reduction 0.59 - Yokomo D-172  [D-172]

Tuning with a front 0.59 FCD gear

The FCD (full counter drift) gear set adjusts the front-to-rear drive ratio in ball-differential drivetrains to encourage counter-drift characteristics when used with Yokomo DP-series drift package setups. With the front turning at 0.59 of the rear (40T x 10T), the front under-rotates and forces smoother steering and throttle inputs compared to matched-speed arrangements.

As a front output reduction, this component is intended for cars running a functioning ball differential and is aimed at drift tuning rather than outright velocity. Drivers will notice milder front bite into corners and will need finer throttle and brake control to maintain a consistent slide.

Fitting advice: after installation, inspect mesh and differential preload, confirm bearings and lubrication are correct, and carry out gradual testing on a practice surface to refine balance settings. The part is a tuning accessory for DP-series drift configurations and will change the car's handling signature.