The Tamiya 40509 Aluminum Differential Joint is a solid replacement for worn plastic joints on the GB-01. Built in aluminum for better wear resistance, it helps keep differential action smooth so the car feels more composed through corners.
Swapping to the Tamiya 40509 reduces flex under load and improves the consistency of power delivery to the wheels. That steadier behaviour makes throttle modulation and steering inputs more predictable during spirited driving.
Ideal for road circuits and rougher club tracks, this joint stands up to regular use while lowering the chance of failure. Regular servicing and correct greasing will preserve its performance and extend service life.
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