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

Split Rear Upper Deck for TRF421

This Factory Pro rear split upper deck is a scale RC hop-up designed specifically for the Tamiya TRF421 chassis. Made from 2mm graphite, the plate replaces the standard rear upper deck to provide a different stiffness profile that integrates with the existing mounting points on TRF421 layouts.

Installation is straightforward for users familiar with TRF421 maintenance: remove the stock rear upper deck, fit the split graphite section to the original screw locations, and verify alignment with the gearbox and bulkheads. No modification of the chassis is required when used with stock TRF421 mounting hardware.

In setup terms this part is intended as a tuning element rather than a standalone performance fix. Swapping to a harder graphite rear upper deck changes how the chassis resists flex under acceleration and cornering, so expect to use it alongside incremental adjustments to shock settings, anti-roll balance, and toe to find the desired handling balance.