JR-TA103-RD is an aluminium front gear box bottom intended for TAMIYA TA01, TA02 and DF01 chassis and finished in red. It functions as an aftermarket replacement for the front portion of the gearbox assembly on the stated on-road models.
The metal lower plate is useful for maintenance and to improve consistency of gear alignment compared with the stock plastic part. It mounts into the original gearbox area and supports stable internal gear spacing during running.
After fitting, check gear mesh, relubricate gears as needed, and ensure there is no contact with nearby steering or suspension components. This is an aftermarket accessory designed for hobby radio control vehicles.