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

Split Upper Deck: Rear Tuning Plate

This rear split upper deck is an aftermarket tuning plate made for the Tamiya TRF421X touring car chassis, produced as a lightweight 1.6mm graphite component. As a precision hop-up it modifies the rear coupling of the upper deck to the chassis, allowing targeted adjustments to local flex and balance without changing the stock mounting layout.

Installation uses the chassis' existing upper deck points and fasteners; confirm clearance and alignment before final tightening. Because the deck is split, the separation line influences load paths through the rear assembly, so small fitment changes or shimming will alter on-track handling in measurable ways.

Consider this part as a setup tool: replace the stock deck to observe differences, or combine it with other deck thickness options and rear-end parts to tune rear traction, rotation, and transient response. It is specified for TRF421X RC kits and should be treated as a chassis tuning component rather than a universal body or structural item.