Expand your competitive edge! The optional Center Differential transfers power to the front and rear differentials independently for smooth power delivery in rough conditions and maximum corner speed. The differential is sealed, and can be adjusted by using different fluid viscosities for specific driving conditions. The center differential is fully assembled and pre-filled, and your vehicle's modular design allows you to install the diff in just minutes. 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.