The GPM FR1200S Medium Carbon Steel Center Differential Kit provides a CNC oriented upgrade path for the Traxxas Rustler 4X4 drivetrain. Its 7075 aluminum differential housing and medium carbon steel output gears increase resistance to wear and transmission shock while allowing full 3S LiPo power to be distributed to all wheels. The unit is engineered to limit reverse loads on the transmission shaft and is compatible with both low and high 1/10 scale chassis layouts.