TRF421X Ball Bearing Gear Diff Joints (compatible with TRF421) - Tamiya 51764  [51764]

Reinforced gear differential joints for TRF421 models

This product is a gear differential joint set built for the Tamiya TRF421 lineup. Included are 2 pieces of TRF421X gear diff joints, ball bearing type, intended as direct replacements for worn parts on TRF421X (Item 42391) or as an upgrade fit for TRF421 (Item 42384). The joints are steel with ball bearings and are located inside the differential assembly to link drivetrain components, offering improved rigidity over worn or stock stamped alternatives.

Compatibility is limited to the TRF421 chassis family shown above, so verify your chassis item code prior to purchase. When installing on TRF421 (Item 42384), install Item 51762 Ball Bearing Set for Universal Shafts to finish the universal shaft bearing arrangement referenced in the parts list.

For tuning purposes these steel, ball-bearing joints are chosen to preserve drivetrain alignment and cut down on play seen with worn diff internals. They are a targeted upgrade for users seeking reliable replacement parts matched to TRF421 geometry.