The upper arm mount A, item number 3451580, is the factory-design replacement for the 42391 TRF421X assembly. It secures the upper suspension arm on the TRF421X, providing the original mounting interface for repair or routine upkeep.
Fit and function: this part returns the suspension to its intended geometry without altering kinematic behavior. When fitting, verify orientation and apply the service-specified fastener torque to avoid introducing binding or looseness in the suspension links.
Tuning role: installing a fresh mount eliminates play from worn mounting points so subsequent setup adjustments—such as camber, roll center, and arm length checks—are based on correct baseline geometry.
Copyright © 2008-2026 rcjaz.co.nz All rights reserved