Yeah Racing Traxxas TRX-4 Aluminum Front/Rear Differential Cover. This optional differential cover is made from aluminum and given a hard titanium coating. Package includes one differential cover and hardware intended for the Traxxas TRX-4 or TRX-6 NOTE: This cover will work with the TRX-6, however, it will only fit the front axle. Features: Perfect fit for the Traxxas TRX-4 or the front of the TRX-6 Made from machined aluminum and given a hard titanium coating