Tamiya TB-04 Rear Lower Suspension Arm TB4056 by GPM  [TB4056]

Aluminium rear lower arm for TB-04

This aluminium rear suspension arm is an aftermarket replacement for the Tamiya TB04 platform supplied as TB4056. It is sold as 1pr and intended for TB-04 series touring car models where metal components are fitted to change suspension response or to replace worn plastic arms.

Fitment is straightforward: remove the original rear lower arm, confirm the mounting points and hardware match TB-04 geometry, then fit the aluminium arm using the original screws and ball studs where applicable. Check for free suspension movement and verify wheel alignment after installation.

As a tuning item, an aluminium rear arm increases local stiffness compared with standard plastic arms, which can reduce flex at the mount and subtly change rear behaviour. Use it when you need a durable replacement or when refining roll and traction; adjust damper rates and toe settings to suit the altered stiffness.