These GPM TRX4037SA CVD main shafts are designed for the Traxxas TRX4 to provide a balance of stiffness and reduced mass by combining alloy 6061 T6 with steel interfaces. The adjustable length architecture allows technicians and hobbyists to achieve correct shaft span for different axle offsets and suspension travel, aiding alignment and driveline smoothness. Supplied hardware permits direct installation into TRX4 driveline assemblies when matched to the vehicle's mounting points.