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

Differential Spring for TAMIYA TRF 416

This 3Racing replacement spring is designed to work with the TRF 416 differential assembly as a direct-scale RC accessory. It serves as the internal spring element that sets initial diff preload and affects how the differential transfers torque between wheels.

Installation is straightforward for hobbyists familiar with TRF 416 diff disassembly: remove the diff case, replace the factory spring with the 3Racing unit, and reassemble using the original shims and bearings. No special tools beyond basic RC maintenance tools are required.

In tuning terms, the spring changes the baseline preload before diff oil and clutch plates (if used) are factored in. A firmer spring raises preload, tightening initial diff engagement and reducing slip under light throttle, while a softer spring lowers preload and allows more differential action. Use incremental testing on the track to balance turn-in, traction, and throttle response for your 1/10 touring setup.