Install the GPM TRX4021BX brass front knuckle arms to upgrade your Traxxas TRX-4 models including the Defender, Tactical Unit and Ford Bronco. These precision made brass parts deliver a tight fit and smooth rotation, improving vehicle stability and steering feedback. The brass acts as external ballast, with each knuckle weighing 50g, which helps increase traction on loose, rocky or muddy surfaces.
Part location: Inner case of the front knuckle
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