Tamiya TRF421 Rear Split Upper Deck Upgrade - Graphite 2mm by Factory Pro O-TCP005  [FP-O-TCP005]

Rear Split Upper Deck for TRF421 Tuning

This Factory Pro split rear upper deck is an aftermarket hop-up made to work with the Tamiya TRF421 chassis. Cut from 2mm graphite, the plate replaces the stock rear upper deck to shift the stiffness profile while using the TRF421's original mounting layout.

Fitting is simple for anyone who services TRF421 kits: remove the factory rear upper plate, align the split graphite piece with the existing screw holes, and refit using the original hardware. The gearbox area and bulkheads should line up without any chassis alterations when fitted correctly.

Consider this part a tuning tool rather than a single-solution upgrade. Moving to a stiffer 2mm graphite rear upper deck changes how the chassis resists flex during acceleration and cornering, so plan small adjustments to damper settings, anti-roll balance, and toe to achieve the handling you want.