Traxxas optional pro ball bearing includes:, One Right output shaft Four Belleville spring washers, Two 19mm Diff, ring One Main Diff, shaft, Two 5 x 8mm ball bearing One Left output shaft, Twelve 3/32 Diff, balls Three 2 x 4mm Cap screws, One Thrust washer retainer One Thrust bearing, Two Thrust washers One Instruction sheet, Two Tube of Diff, ball grease Three Split washers, One 45 tooth Main Diff, gear One 60 tooth Main Diff, gear, SKU: RCHOB0537