Tamiya 51745 TRF421 Gear Differential Unit Set - Versatile tuning pack  [51745]

Upgrade your TRF421 with the Tamiya 51745 differential

The Tamiya 51745 Gear Differential Unit Set supplies the replacement internals needed to refresh or tune the TRF421 diff. The kit supports fine adjustments so you can match the car to the driving conditions you face.

Set up for mixed surfaces using oil changes

Changing the differential oil lets you alter how torque is shared between wheels, which affects corner exit and mid-corner grip. Experiment with viscosities to suit both smoother paved surfaces and rougher tracks.

Fit front or rear to experiment with balance

This gear differential can be fitted to the front or rear of the TRF421 to shift handling characteristics. Swapping its position is a quick method to test different balance points and improve overall stability.