TAMIYA TB-04 Aluminium Rear Arm Bulk Upgrade TB4009 by GPM  [TB4009]

Precision aluminium rear bulk for TB-04

This CNC-inspired aluminium rear arm bulk is made to replace the TB-04 stock plastic component and is supplied as one replacement set. It provides a firmer pivot and mounting area for rear arms and suspension links, reducing unwanted movement under braking and acceleration.

Installation requires basic workshop tools: remove the original bulk, transfer any sealed bearings and linkage hardware, then secure the new aluminium piece using the chassis mounting points. Check fastener torque to keep the assembly true and avoid over-tightening that could stress the chassis.

On the track the TB4009 helps make rear suspension adjustments more predictable by limiting flex at the arm mounts. Expect a cleaner, more repeatable handling feel; tune shock valving and roll characteristics progressively to suit your driving style and surface conditions.