These gearbox joints are used when the TT-02 chassis is fitted with Item 53792 Assembly Universal Shaft (TT-01, TA04). Steel components help cut power loss and realize smooth motion.
Compatible Chassis:
TT-02 (Use with Item 53792 Assembly Universal Shaft (TT-01, TA04).)
TT-02 Type-S
TT-02B (Use with Item 53791 DF-02 Assembly Universal Shaft.)
TT-02D (Use with Item 53792 Assembly Universal Shaft (TT-01, TA04).)