TRF421 Gear Differential Joints, Ball Bearing Steel Type for Tamiya 51764  [51764]

Precision diff joint set for TRF421 chassis

This listing is for a gear differential joint set intended for the Tamiya TRF421 series. The package comprises 2 pcs of TRF421X gear diff joints, ball bearing type, designed as direct replacements for worn components on TRF421X (Item 42391) or as upgrade pieces for the standard TRF421 (Item 42384). The joints are steel with ball bearings and locate inside the differential to link drivetrain parts while improving rigidity over worn or stamped stock components.

Compatibility is limited to the TRF421 family shown above; verify your chassis item code prior to ordering. When fitting to TRF421 (Item 42384), use Item 51762 Ball Bearing Set for Universal Shafts to complete the universal shaft bearing arrangement as outlined in the original parts list.

From a setup perspective these steel, ball-bearing joints are chosen to preserve drivetrain geometry and reduce play introduced by worn diff internals. They represent a precise hop-up for enthusiasts who need replacement components that align with TRF421 series specifications.