Scale and durability are the main focal points of this one of a kind HD Driveline Kit, designed for the Traxxas TRX-4 Defender. This HD Driveline features a scale look and light-weight construction, compared to the X-Duty Drives; nearly 30% lighter and 25% slimmer. The HD Driveline Kit is truly a beast in its own right, but MIP didn't veer away from all of the design aspects built-in the popular MIP X-Duty Driveline. MIP has also incorporated ultra-strong spline technology and MIP CVD makeup. The MIP HD Driveline Kit, additionally has an impressive 35 deg. of articulation and features phased aligned joints that key the male and female splines for smooth power transfer under load with no binding or vibration. Of course, all components are heat treated from the highest quality American grade alloy steels.