This is an 8x77mm RC replacement dog bone provided as 1 pcs for Savage X series drive systems. The item is identified by model HPI-86151 and finished in silver; it transmits torque from the gearbox output to the axle while allowing necessary suspension articulation.
Install this item when the stock dog bone is bent, broken, or during drivetrain setup and tuning. Confirm the 8x77mm measurement and that the dog bone engages correctly with the output cup and axle hub on your Savage X components before use.
Fitment notes: to access the dog bone ends remove the wheel and lower the suspension, inspect mating cups and retaining pins for signs of wear, and confirm rotational freedom through suspension travel after refit. Perform an initial low-load test run before full operation.