Traxxas Pro Ball Differential must be assembled and includes, one differential ball grease tube, one thrust bearing grease tube, one right output shaft, one left output shaft,two 25 mm differential rings, one thrust washer retainer, two 5x8 mm bearings, one main differential shaft, four Bblleville spring washers, twelve 3/32 differential balls, one main differential gear (45 Teeth, three 2x4 mm cap screws, six 2 mm split washers, one 2.6x10 mm self tap round head screw, one thrust washer and one 2.6x8 mm flat head screw.