On-Road Differential Adjusting Screws - Yokomo ZS-508S  [ZS-508S]

Precision adjusters for on-road differentials

These Yokomo ZS-508S Differential Adjusting Screws are an RC-scale replacement part built for tuning and servicing on-road differential units. They act as the threaded adjuster used to set preload and influence torque transfer within the differential, providing a predictable mechanical interface for setup changes whether at the track or on the bench.

The screws are designed to be installed into compatible R/C differential housings or carriers in place of factory adjusters. Installation requires access to the differential internals, removal of the original adjuster, and careful reassembly while maintaining correct gear alignment and lubricant condition. Use appropriate small hand tools and apply moderate torque when seating the screws to avoid damaging threads.

For tuning, these adjusters offer a straightforward method to vary preload and the effective engagement of the diff; small, measured turns produce noticeable changes on high-grip surfaces. Combine adjustments with observation of handling and lap times, and always confirm smooth gear mesh and bearing condition after reassembly. Treat this as a model-scale drivetrain component and verify compatibility with your differential before fitting.