This is the Tekno RC Big Bone Driveshaft and Outdrive Set for the Traxxas Hoss 4×4 and Rustler 4x4 trucks. These will solve the many issues associated with the stock center driveline. First off it's FAT! Yet its still extremely lightweight.
It’s a dog bone rather than a simple splined shaft and as such will not bind, split, or bend the way the stock shaft does. The laser-etched shaft is machined from high-quality aluminum and anodized for incredible wear. Hardened steel outdrives on either end replace the weaker stock parts for the ultimate center driveline available for the HOSS and Rustler 4x4 vehicles.
So yeah, it’s a ‘must have’ for any racer or basher. Another rock-solid upgrade from Tekno RC!
* The O-rings go inside the drive cups two in each cup.