This upper deck is an aftermarket plate designed for the Tamiya TRF421X chassis, offered by Factory Pro as O-TCP010. It is intended to mate with the TRF421X layout and to provide a means of refining chassis stiffness for on-road setups.
As a 2mm graphite plate the part changes torsional response relative to typical stock decks, which can affect turn-in and mid-corner behaviour. Fitment is achieved using the chassis' existing mounting points and alignment features.
Installation notes: install using the original chassis fasteners where possible and check screw lengths and clearances during assembly. Confirm there is no interference with suspension towers or servo mounts and validate the setup on the bench before track use.
Use this upper deck to fine-tune chassis rigidity and then balance changes with suspension and ride-height adjustments for optimum on-track performance.
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