This propeller shaft set uses a universal joint to connect the front and rear gearbox instead of the kit standard &ldquodog-bone&rdquo style connection. The universal type connection offers smoother transfer of power thereby increasing the efficiency of the TB-05 drivetrain.  - 122mm Aluminum Propeller Shaft x1  - Cross joint, input shaft and other small parts included.  - These parts replace kit standard propeller shaft and pilot shaft.  - Newly-designed universal joint propeller shaft will give smooth, efficient power.