Tekno RC Big Bone Center Driveshaft and Outdrives Kit. This optional center driveshaft is intended for the Traxxas Hoss 4x4 or Rustler 4x4. Featuring a dog bone style layout to correct binding, bending and splitting issues found with the stock driveshaft. Hardened steel outdrives on either end replace the stock parts for the perfect center driveshaft assembly. Package includes one center driveshaft, two outdrives and hardware.