TRF421/TRF421X Gear Diff Joints Upgrade for Tamiya 51764  [51764]

High-strength joints for the TRF421 family

This set is an RC gear differential joint kit designed specifically for the Tamiya TRF421 family. The package includes 2 pcs of TRF421X gear diff joints, ball bearing type, intended as direct replacements for worn components on the TRF421X (Item 42391) or as an upgrade option for the standard TRF421 (Item 42384). The parts are steel, ball bearing type, and sit inside the differential to connect drivetrain components while improving rigidity compared with worn or stamped stock pieces.

Fitment and compatibility are confined to the TRF421 chassis line noted above, so check your chassis item code before ordering. When installing on TRF421 (Item 42384), fit Item 51762 Ball Bearing Set for Universal Shafts to complete the universal shaft bearing arrangement as listed in the original parts documentation.

In tuning use these steel, ball-bearing joints to keep drivetrain alignment and to reduce play caused by worn diff internals. They serve as a precise hop-up item for racers and hobbyists who need dependable replacement components that match TRF421 series geometry.