The Tamiya #3404157 Upper Deck A is a dedicated upgrade for the TRF421 chassis that enhances structural stiffness and reliability. Precisely made to match the TRF421 layout, it tightens the chassis feel and supports more consistent on-track performance.
By cutting down chassis flex, the Upper Deck A helps the suspension react more predictably and keeps the tyres working in a stable window. This contributes to cleaner turn-in and steadier exits during cornering.
For racers fine tuning their TRF421, this upper deck helps refine balance and traction consistency, making it a practical upgrade when chasing consistent lap times.
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