Tamiya 3451580 - Upper Arm Mount A for 42391 TRF421X TRF421X chassis spare part  [3451580]

Upper Arm Mount A for TRF421X

This upper arm mount A is the factory replacement item identified as 3451580, matching the 42391 TRF421X assembly. It serves as the fixed connection point for the upper suspension arm on the TRF421X assembly and is offered as a direct spare for maintenance or repair tasks.

Fit and function: the part is intended to restore factory geometry without altering suspension kinematics. When replacing, confirm orientation and fastener torque against the service notes for the TRF421X assembly to avoid binding or excessive play in the suspension links.

Tuning role: swapping this mount with a service unit restores baseline arm positioning after wear or crash damage, allowing subsequent tuning steps—such as camber, roll center adjustments, and arm length verification—to be carried out from a known starting point.