The Tamiya #3404157 Upper Deck A is an engineered upgrade for the TRF421 chassis that enhances structural integrity. With careful machining and fitment for the TRF421, it reduces unwanted movement in the chassis and helps deliver a crisper driver feel during aggressive laps.
This upper deck is matched to the TRF421 geometry to lower chassis flex and stabilise the platform. The result is more consistent handling and improved turn stability, which supports confident driving on a range of track surfaces.
Drivers refining their TRF421 for competitive or club racing will find the Upper Deck A beneficial for fine tuning weight distribution and improving traction consistency throughout a run.
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