This is a Traxxas Torque Control Upgrade Kit, and is intended for use with the Traxxas T-Maxx monster truck. The Revo-Spec Torque-Control slipper clutch upgrade kit adds Revo refinement and control to Classic Maxx trucks equipped with the original T-Maxx transmission. The Torque-Control slipper clutch (patent pending) is engineered for high thermal capacity and uses specialized semi-metallic friction pads for consistent traction control. The molded alloy pressure plate is finned to provide extra cooling. The precision adjustment allows fine-tuning for enhanced traction on slick surfaces. Spur gears can be quickly removed and changed without altering the slipper adjustment.