Yokomo D-172 Front x0.59 (40-10) FCD set for Ball Differential, front reduction gear for DP-series drift package  [D-172]

Front reduction FCD gear set

This FCD (full counter drift) gear set changes the front-to-rear drive ratio on ball-differential drivetrains to enable controlled counter-drift behavior with Yokomo drift package setups. It reduces front rotational speed to 0.59 times the rear (40T x 10T), producing a front-driven under-rotation that requires smoother throttle and steering inputs compared with uniform-speed setups.

As a reduction gear for the front output, the part must be used with a functioning ball differential and is intended for on-track drift tuning rather than speed-oriented driving. Expect the car to respond with more gradual front bite during corner entry and to need finer modulation of throttle and brake to balance the rear end.

Installation notes: check mesh and differential preload after fitting, verify lubrication and bearing condition, and test incremental adjustments on a practice surface before full-speed runs. This component alters handling balance and is primarily a tuning option for drift package configurations.