PINION/DIFF GEAR 13-T REARPinion gear, differential, 13-tooth (rear) (use with #7779 42-tooth differential ring gear) Part 7778 UPC 020334777805Traxxas 7778 Pinion Gear Differential 13-Tooth Rear X-MAXX NEW IN PACKAGE TRA1SKU: 7778$6.00PriceQuantityAdd to CartBuy Now