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

COMMENTS: Since there are a few kits this will work for, two differential gears are provided in this differential kit.