Tamiya 3455252 Diff Joint for F101/F102 Group C Chassis  [3455252]

Durability replacement for F1 Group C differentials

This item is a replacement differential joint provided as an RC spare for Tamiya F1-style upkeep and hop-up activities. It corresponds to the 84385 diff joint designation and is intended as a service component when renewing or repairing differential internals on F101/F102 Group C hop-up chassis.

Functionally the part links gears and axles within the differential to transfer torque. A degraded joint can create play, inconsistent torque flow, or speed up wear on adjacent components; renewing the joint helps return the assembly to its intended mechanical condition.

Installation is a technical workshop task: extract the differential from the chassis, disassemble the housing, replace the worn joint with the new piece, confirm mating surfaces and clearances, reassemble, and check for smooth rotation. During the swap, inspect bearings and gear teeth for wear to avoid repeating service soon after.

Effect on setup: the replacement preserves the existing diff geometry while removing slack and variability caused by a worn joint, resulting in steadier handling once other settings are unchanged.