Tamiya TRF421X Split Upper Deck Lite Rear Graphite 1.6mm by Factory Pro O-TCP012S  [FP-O-TCP012S]

TRF421X Rear Split Upper Deck

This is an aftermarket rear split upper deck designed for the Tamiya TRF421X RC touring car platform, supplied as a lightweight graphite plate with a 1.6mm nominal thickness. As an RC-scale replacement hop-up, it changes how the rear section of the upper deck couples with the chassis, allowing measured adjustments to local flex and balance without altering stock mounting geometry.

Installation follows the vehicle's original mounting points and uses the chassis' existing fasteners. Check mating surfaces for clearance and alignment before final torque. Because this is a split upper deck, the separation line affects how loads transfer through the rear assembly, so small changes in fit or shimming will produce perceptible differences in on-track behavior.

In tuning terms the part is intended to be a chassis-level tool: swap it with the stock deck to compare responses, or use it alongside other deck thicknesses and rear-end components to refine rear grip, rotation, and transient response. The part is explicitly for RC-scale TRF421X kits and should be treated as a component for chassis setup rather than a generic body or structural replacement.