This is an RC-scale replacement dog bone sized 8x77mm supplied as 1 pcs, intended for Savage X series drivetrains. The part is identified by model HPI-86151 and finished in silver, and its role is to transmit torque between the gearbox output and the wheel axle while allowing suspension articulation.
Use this component when a factory dog bone is worn, bent, or when setting up drivetrain geometry during tuning. Before fitting, verify the 8x77mm dimension and that the dog bone engages cleanly with both the output cup and axle hub on your Savage X parts.
Fitment notes: remove the wheel and lower suspension to access the dog bone ends, inspect mating cups and pins for wear, and confirm rotational freedom through the suspension travel after installation. Retest movement under low load before full use.
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