Driveshafts, rear, steel-spline constant-velocity (complete assembly) (2)Driveshafts, rear, steel spline constant velocity (complete assembly) (2) Extreme heavy duty rear steel CV (constant velocity) driveshafts are engineered to satisfy the performance and durability needs of the most demanding drivers. Designed specifically for monster truck applications, these shafts are built to withstand the brutal torque from the 540XL motor and the massive grip of the huge Sledgehammer tires. The unique splined telescoping design