Tamiya 42185 TRF417 Gear Differential Unit - Precision Tuning  [42185]

Precision Upgrade for TRF Builds

The Tamiya 42185 - TRF417 Gear Differential Unit is a durable gear-type differential that lets drivers adjust handling by changing silicon oil viscosity. Compared with standard diffs, this unit helps deliver more predictable cornering and reduced internal wear for sustained performance.

Model Fitment and Setup

This gear differential is compatible with TRF416, TRF416WE, TRF416X, and TRF417 chassis. The robust construction reduces maintenance frequency, and careful installation with correct shimming will ensure smooth operation on race days.

Fine-Tuning with Silicon Oil

Varying the internal silicon oil alters lock-up and slip characteristics so you can tailor the car to different tracks and driving styles. Many builders use Tamiya Item 53455 Silicon Damper Oil Hard Set (1000) as a solid baseline for stability.