This front differential from GPM is engineered using 4140 carbon alloy steel for gear durability and 7075-T6 aluminium for a stiff, lightweight housing. The spiral cut ring gear and hardened black surface treatment increase contact surface hardness and extend service life under repeated load. Delivered fully assembled with bearings, the unit is a direct replacement for factory parts #ARA311193 + #ARA311182 and is suited to demanding small scale ARRMA use.