The SD-644SA from Yokomo is a single aluminium main drive shaft intended as a replacement part for the Drift Package / Drift Racer family. It is supplied to restore drivetrain function on compatible DP and MRTC chassis after wear or damage.
In service the shaft carries torque from the gearbox output to the final drive. During installation verify spline alignment, check bearing seating, and hand-rotate the assembly to ensure free movement before running the model. Use the original retention hardware where suitable and avoid forcing components into position.
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