This is a replacement aluminum drive cup intended for the BD5 series gear differential unit, supplied as an aftermarket spare for scale RC use only. The part provides a direct swap-in function where the original drive cup is removed, restoring drive transfer between the diff outdrive and the half shafts.
The component is described as aluminum and is intended to offer a durable contact surface in the drivetrain assembly without changing the diff's internal geometry. Use this part when a worn or damaged drive cup is identified during routine maintenance or when preparing a chassis for track tuning.
The text below lists the chassis models explicitly supported by this item; confirm fitment against your car's service manual before installation.
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