The Yokomo Y2-RAC4 is a spur gear hub designed for use with the YD-2 series A-arm SP rear suspension kit on RC drift chassis. It functions as the hub/top-shaft component that interfaces with the kit's rear assembly, and is intended to be used together with the matching components supplied for the same kit.
In practical terms this part is an RC-scale replacement or spare that keeps the rear drive and suspension alignment correct when servicing or upgrading the A-arm SP rear setup. Fitment and positioning follow the original kit layout, so it is used in the context of routine maintenance, part replacement after wear, or small tuning adjustments to rear end geometry.
Installation notes: verify the hub mates cleanly with the kit's existing spur gear and hardware, check for correct mesh and bearing seating, and re-check wheel alignment after assembly. Use the original fasteners and torque settings from the YD-2 A-arm SP kit where specified.
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