E2219 Rear Universal Set (1pr): X8R/8RE/8/8E, X7R

The rear universal driveshaft’s come stock on the MBX7R and can be used as an option for the MBX8 nitro and Eco buggy. If used on the MBX8, additional 8x16x5 bearings will be required. The universal driveshaft will have less friction compared to the CVA style driveshaft. The reduced friction will have a softer feel in bumpy conditions, slightly increase steering, and reduce rear traction.

 https://www.youtube.com/watch?v=z93U_j201KI