Differential Adjusting Screws for On-Road R/C - Yokomo ZS-508S  [ZS-508S]

Differential adjuster screws explained

These Yokomo ZS-508S Differential Adjusting Screws are produced as a replacement part for on-road R/C differentials, intended to assist with tuning and maintenance. They act as the threaded mechanism to set preload and change how torque is distributed through the differential assembly, offering a reliable mechanical adjustment point.

The screws are intended to replace the factory adjuster within compatible differential housings or carriers. Fitting them requires opening the differential, removing the original adjuster, and careful reassembly while preserving gear alignment and lubricant condition. Use suitable small hand tools and avoid excessive torque to protect thread integrity.

In tuning practice, these adjusters enable subtle changes to preload and engagement that can affect handling on high-traction surfaces. Make adjustments incrementally, observe handling and lap performance, and always confirm smooth gear mesh and bearing condition after reassembly. Ensure the screws match your differential before attempting installation.