TEKNO R/C TKR68551 Big Bone Center Outdrive Rear Slash/Stamp 4x4 TKRC6851 This is the Tekno RC Big Bone Rear Center Outdrive for the Traxxas Slash 4x4 and Stampede 4x4. Features:Hardened steel outdrivesFAT, Big Bone shaft is much stronger than stockFor the Traxxas Slash 4x4 and Stampede 4x4Laser etched and black anodized for wearThe Tekno RC Big Bone Rear Center Outdrive for the Traxxas Slash 4x4 and Stampede 4x4 solves many of the common issues associated with the stock center driveline.