Designed for extreme performance applications, the rear extreme heavy-duty U-joint driveshaft adds extra material to critical areas for even greater strength. Traxxas extreme HD driveshafts are our most rugged composite shafts, combining affordability with durability. Steel driveshafts are also available for drivers requiring even more power handling for high-power applications. The extreme HD driveshaft comes pre-assembled with screw pin and ready to install. Fits left or right side.