Tamiya TRF421X Split Upper Deck Rear Graphite 2mm by Factory Pro O-TCP012  [FP-O-TCP012]

Split upper deck rear for TRF421X

This Factory Pro FP-O-TCP012 rear upper deck is an aftermarket, RC-scale replacement designed specifically for the Tamiya TRF421X chassis. Machined from graphite at a nominal 2mm thickness, the split design mounts to the rear of the upper deck to add localized stiffness while preserving clearance for drivetrain and suspension movement.

Use this part when you want a repeatable way to alter rear-end rigidity as part of setup changes. Increasing upper deck stiffness with a graphite insert affects chassis flex patterns, which in turn changes traction and steering response; consider this as one element in an overall tuning plan alongside shock valving, camber settings, and anti-roll adjustments.

Installation follows standard upper-deck replacement practice: remove the original rear upper deck piece, position the split graphite panel, and secure using the chassis' existing fasteners. Do not overtighten hardware to avoid crushing the graphite, and verify clearance with the motor and suspension travel before running.