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This is the RC Part by Traxxas - Ring gear, differential/ pinion gear, differential (machined) (front or rear) part no. TRA9579R
Made for the most extreme action, spiral-cut 43-tooth ring and 10-tooth pinion differential gear sets are CNC-machined from a solid block of steel. The teeth are cut with a slight curve to minimize backlash between gears and maximize tooth traction with more surface area than straight-cut gears.