This set provides two steel gear box joints intended for RC Tamiya 4WD models, supplied as 2 pcs per set and designed to be direct-fit replacements for common gearbox coupling positions on Hotshot, Hotshot II, Super Hotshot, Bigwig and Boomerang 4WD chassis. The aim is to improve drivetrain durability where original plastic couplers might wear.
Maintenance and upgrade use: change these joints when you detect play or wear in the stock couplers during inspection, or install them as a preventative measure for regular trail or off-road use. Steel construction delivers improved longevity while preserving original mounting positions to keep handling and geometry consistent.
Fitment summary: remove the gearbox cover and aged coupler, seat the new steel joint into the factory location, confirm mesh and clearance, then close the gearbox. After fitting rotate the drivetrain and fine-tune gear mesh if necessary. These joints are for repair and tuning and do not change suspension or motor mounting geometry.
Tamiya 9808129