Tamiya TRF421 Medium Split Upper Deck 2mm Graphite by Factory Pro O-TCP004  [FP-O-TCP004]

TRF421 split upper deck upgrade

This Factory Pro part is a split upper deck made for the Tamiya TRF421 touring car chassis. It is a 2mm graphite top plate designed as a direct replacement to allow setup changes within the chassis stack.

The medium split layout lets builders alter local stiffness and fore-aft mass distribution without changing lower chassis components. Swapping this upper deck changes flex characteristics that can be used during setup work to dial in grip and handling balance on asphalt circuits.

Installation is straightforward for experienced kit builders: remove the existing upper deck, move any spacers or mounting hardware across, and fasten the split panels to the factory mounting points. Check bulkhead alignment and tighten screws evenly to avoid introducing unwanted preload on the chassis.