The Traxxas® Mini Maxx® WideMaxx Extreme HD Driveshaft Assembly is a replacement designed for the Traxxas Mini Maxx Brushless 1/16 4WD Monster Truck when using the Traxxas Mini Maxx® HD WideMaxx Suspension Conversion Kit (TRA10790 - sold separately). This heavy-duty (HD) driveshaft assembly is compatible with both front and rear, left and right side positions, making it ideal for ensuring your truck stays in optimal condition