TAMIYA TRF 416 Aftermarket Differential Spring Steel Wire 416-10C by 3Racing  [416-10C]

TRF 416 Spring Summary

This 3Racing spring is produced as a replacement internal spring for TRF 416 differential assemblies, providing the preload element that affects torque transfer between wheels. It is intended for hobbyists tuning 1/10 touring cars.

Fitting is quick for anyone familiar with TRF 416 diffs: open the case, swap out the OEM spring for the 416-10C, then refit the shims and bearings you removed. No special equipment beyond basic RC tools is needed.

Technically, the spring sets the initial preload before you choose diff oil or clutch plates. A harder spring raises preload for a tighter initial lock and reduced slip on light throttle, while a softer spring lowers preload and increases differential action. Make incremental changes and test on track to tune turn-in, mid-corner balance and throttle response.