Tamiya 84425 Aluminum Lower Gearbox for TB Series Chassis  [84425]

Upgrade Your TB Chassis with an Aluminium Lower Gearbox

The Tamiya 84425 Aluminum Lower Gearbox replaces the OEM plastic lower case on TB-03, TB-04 and TB Evo.6 cars to enhance drivetrain efficiency and increase chassis rigidity. It provides a more robust mounting base for suspension and upper components without altering core geometry.

Aluminium Advantages Explained

Using machined aluminium reduces flex and offers consistent support for damper stays and upper mounts. This metal lower gearbox is less prone to deformation under heat and repeated impacts than the plastic alternative.

Compatibility Notes

Designed for both front and rear positions on the compatible TB chassis, this lower gearbox is useful for track builds as well as routine off-road use. It helps maintain accurate drivetrain alignment during aggressive driving.