The JR-TFD09-LB aluminium unit is an aftermarket replacement serving as the rear suspension arm mount and gearbox support for specific TAMIYA buggy models. It replaces the factory B8 rear mount elements to provide a stiffer mounting surface for the rear suspension and gearbox while maintaining the stock chassis mounting points.
Compatibility is limited to the named TAMIYA kits that share the B8 mount layout. The component is finished in blue anodized aluminium which matches common hop-up styling and helps resist routine wear from hobby use.
Installation advice: mount in the same B8 positions as the original parts, check gearbox mesh and clearances around suspension links and the spur gear after fitting. As a tuning upgrade, it reduces rear flex and gives a firmer base for suspension and drivetrain adjustments.