KYOSHO Mini-Z MR-02 Ball Differential Shaft by 3Racing MZII-003  [MZII-003]

Mini-Z MR-02 ball differential shaft overview

This is an RC-scale replacement ball differential shaft designed for KYOSHO Mini-Z MR-02 platforms, offered as an aftermarket spare by 3Racing MZII-003. It serves as the rotating axle inside the ball differential assembly for MM and RM MR-02 variants and is intended for use in hobby electric micro touring cars only.

Compatibility is limited to Mini-Z MR-02 (MM) and Mini-Z MR-02 (RM) as stated, so confirm your chassis type before fitting. The shaft's role is mechanical: it locates and transmits torque through the ball differential, influencing slip characteristics and overall drivetrain feel.

Installation notes: remove the differential housing from the transmission case, extract the existing shaft and bearing stack with care, and install this shaft with the correct orientation inside the differential cage. Reassemble using the original ball bearings and shims, checking pre-load and end play as specified by your chassis manual. Use a clean workspace and small hex driver set for the Mini-Z hardware.

Tuning impact: swapping the differential shaft itself does not change tuning dramatically, but replacing a worn shaft can restore consistent engagement and reduce irregular slip. When adjusting differential behavior for corner entry or traction, pair shaft replacement with inspection of balls, shims, and differential grease to achieve predictable results on carpet or asphalt micro tracks.