Tired of losing drive to your axles because 3 little bolts loosened up?  The Robinson Racing Heavy Duty Comp Hard Output Gear is a heavy duty steel upgrade compatible with any truck using the AX10 style transmission, such as the SCX10 and SMT10. This gear features a two piece design, that includes an extra hard 5mm diameter shaft that can be replaced if needed.  Note:  Not compatible with the SCX10-II Kit version 2-Speed Transmission.