The Tamiya #3404157 Upper Deck A is a purpose-built upgrade for the TRF421 chassis, crafted to increase frame stiffness and enhance durability. It helps stabilise the car under load and gives drivers clearer feedback through the steering during track sessions.
Fitted to the TRF421 platform, this upper deck reduces flex so the suspension and tyres can work more predictably. The extra rigidity benefits mid-corner stability and improves the car's behavior during quick direction changes.
Whether refining a club car or preparing a race rig, the Upper Deck A supports improved weight distribution and steadier traction, making it a solid upgrade for serious TRF421 setups.
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