TRF421X Gear Differential Unit - 51767 by Tamiya  [51767]

TRF421X gear differential replacement

This gear differential unit set is a direct replacement component for the TRF421X series and is intended for 1/10 scale touring car applications. The assembly uses gear-type internals to control torque distribution between the driven wheels for predictable handling.

Use this unit for routine maintenance or when changing differential response is part of setup work. Installation requires basic disassembly of the centre gearbox and careful attention to correct gear mesh and bearing seating to maintain smooth operation.

When replacing the assembly, inspect related bearings and spur/pinion contact for wear, and verify the gearbox torque screw settings to avoid unintended preload on the differential. Follow standard RC workshop practice and use correct tools for secure fastening.

This replacement differential unit is intended as a direct spare for TRF421X-based 1/10 touring cars, useful for restoring drivetrain function or adjusting differential behaviour during setup work.