Tamiya TRF421X Split Upper Deck Front, Graphite 2mm — O-TCP011 by Factory Pro  [FP-O-TCP011]

Split front upper deck: application for TRF421X

The split upper deck front is an aftermarket 2mm graphite plate created for the Tamiya TRF421X platform by Factory Pro, O-TCP011. It is intended to influence front chassis stiffness and tuning characteristics without altering suspension geometry.

Design and role: the unit secures to the front area of the TRF421X upper deck and functions as a structural tuning element to modify chassis flex. Replacing the stock material with 2mm graphite provides a simple route to adjust steering sensitivity and transient response across different track conditions.

Installation notes: remove the original upper deck front following the car's service instructions, check that contact surfaces are true, and fit the new plate to the existing mounting locations using the standard hardware. Tighten bolts evenly and ensure steering linkages and the servo horn are clear before final checks. Run a brief on-track evaluation to measure handling changes and update shock or roll bar settings as required.

Compatibility and tuning context: designed for TRF421X family variants that share the same upper deck layout, this part is focused on chassis stiffness tuning rather than changing arms or bulkheads. Introduce the change incrementally and document results to find the best combination of parts and settings.