The Tamiya 9803475 Upper Deck B strengthens the TRF421 chassis to reduce flex and keep the suspension geometry consistent. Crafted for accurate fit, it supports precise setup work and repeatable handling traits.
With less chassis movement, steering inputs translate more directly to wheel response, helping drivers maintain lines and consistency during long runs or competitive heats.
This upper deck is formed to align with TRF421 mounting patterns and reinforces the chassis where it matters most, improving longevity under demanding use.
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