Traxxas 8683 hardened steel differential output gears for the 1/10 scale E-Revo VXL. Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user s manual for exact parts listings.