MC3WLS's Differential features: new dual thrust bearing technology, reducing side to side loading onto the bearing plates reducing friction, increasing smoothness with an adjustable collar to tune the diff's performance. Includes: Heavy duty 3mm Axle, all diff components, bearings, 52, 53, and 54 tooth spur gears, 9, 10,11 and 12 tooth pinions and ceramic diff balls...(D I S C O N T I N U E D)