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

Precision rear arm bulk for TB-04 chassis

This precision-machined aluminium rear arm bulk is manufactured to replace the original TB-04 plastic unit and is supplied as a single replacement set. The component provides a rigid anchor for rear suspension links and arm pivots, reducing deflection under load and improving setup repeatability.

Fitting requires standard RC workshop steps: remove the OEM bulk, transfer sealed bearings and linkage hardware, then install the aluminium bulk into the existing mount points. Correct fastener torque and verification of bearing fit are recommended to ensure true alignment and avoid induced stresses in the chassis.

From an engineering perspective the TB4009 increases lateral and torsional stiffness at the rear suspension pick-up points which yields more consistent bump and rebound behaviour. Use incremental changes to shock valving and anti-roll characteristics when validating handling on different track surfaces.