The Tamiya 9803475 Upper Deck B improves torsional rigidity on the TRF421 chassis, helping the car track truer through a sequence of corners. Machined and finished to tight tolerances, this plate helps keep setup changes predictable run after run.
Reducing unwanted chassis flex gives more immediate steering feedback and steadier front traction under heavy cornering forces. That stability helps when you are dialing in sensitive steering settings.
Made to match the TRF421 mounting points, this upper deck integrates cleanly into the stock layout and reinforces key structural areas for extended durability during club or track racing.
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