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 delivers full-range articulation, so there is never a need to limit suspension travel. They are made by Traxxas, for Traxxas so you can always count on easy installation and the perfect fit.