Lightweight backside gear diff axle shaft for 1/12 pan automobile gear differential features tough shaft that's specially machined for perfect stability and smoothness with zero run-out for vibration-free procedure. Made from HUDY Spring metal Lightweight design for paid off rotating fat. Fits #374900 â€✠Gear Diff 1/12 Pan Vehicle. Note: please be aware that due the nature of this gear differential therefore the forces and tensions involved, kit differential with both metal and graphite axle will tend to be less resistant regarding the wear and/or breakage than the standard ball differentials. If you are maybe not worried about performance however the reliability and lifetime we recommend to make use of the standard ball differential.