Compact Tamiya 51745 TRF421 Gear Differential Unit Set for tuned handling  [51745]

Improve lap consistency with the Tamiya 51745 diff for TRF421

The Tamiya 51745 Gear Differential Unit Set is supplied with the internal parts needed to service or upgrade the TRF421 differential. It is a straightforward option for racers wanting predictable diff behaviour across session changes.

Adjust behaviour for different circuit surfaces

Use different differential oil grades to change how the car transfers power through corners. A thinner fill encourages quicker direction changes on smooth circuits, while thicker oil helps maintain drive on rougher surfaces.

Works in either front or rear for setup flexibility

Install this unit in the front or rear of the TRF421 to alter the car's handling bias. Moving the diff location is a simple way to influence traction and turn balance when tuning for specific tracks.