Kyosho Mini-Z MR-01 Ball Diff Replacement Shaft KM-010 by 3Racing  [KM-010]

Guide to the Mini-Z MR-01 ball differential shaft

This item is a replacement rotating shaft for the Kyosho Mini-Z MR-01 ball differential assembly. It forms the central spindle of the ball-type diff, enabling torque transfer while allowing different wheel speeds when negotiating corners or low traction spots.

Install a replacement when the shaft shows signs of wear, scoring, or end play that disrupts smooth diff behaviour. A renewed shaft brings the differential back to consistent operation and reduces wear to balls and race surfaces when maintained correctly.

Assembly is familiar to those experienced with Mini-Z drivetrains: open the diff housing, inspect and clean balls and races, fit the replacement shaft ensuring correct seating, and reassemble with original preload and clearance settings. Run a short track test and adjust diff tune as needed.