Replacement Steel Gear Diff Joints for TRF421 Series - Tamiya 51764  [51764]

Durable differential joints for TRF421 chassis

This item is an RC gear differential joint set produced for the Tamiya TRF421 family. The box contains 2 pcs of TRF421X gear diff joints, ball bearing type, intended to replace worn parts on the TRF421X (Item 42391) or to be used as an upgrade on the standard TRF421 (Item 42384). Constructed from steel with ball bearings, the joints fit inside the differential to couple drivetrain elements while increasing rigidity compared with worn or stamped standard parts.

These joints are compatible only with the TRF421 chassis line stated above; please confirm your chassis item code before ordering. If installing on TRF421 (Item 42384), you should use Item 51762 Ball Bearing Set for Universal Shafts to complete the universal shaft bearing arrangement as referenced in the original parts list.

In setup and tuning scenarios these steel, ball-bearing joints help maintain drivetrain alignment and reduce slack caused by worn diff internals. They represent a focused hop-up for drivers who want dependable replacement components tailored to TRF421 geometry.