TRF421X Upper Deck R Hop-Up 3404176 by Tamiya  [3404176]

TRF421X Upper Mounting Plate

The Tamiya 3404176 Upper Deck R is a dedicated top plate for the TRF421 range, noted with compatibility to 42391 TRF421X. Installed at the top of the chassis assembly, it acts as the principal mounting surface for upper links and related components and is intended as a direct-fit spare.

The deck's purpose is structural and positional: it secures upper link anchor points and delivers repeatable mounting locations that factor into overall chassis geometry. Used during setup, it helps locate suspension and electronics without changing the rest of the chassis architecture.

Installation follows standard TRF421 practice: remove the body and any radio parts that impede access, remove the fasteners retaining the old deck, fit the replacement plate, and tighten screws to the specified torque. No unique tools are required, only standard hex drivers.

For ongoing care, maintain clean mating faces and inspect screw threads and captive nut alignment before final assembly. Retain original fasteners where serviceable.

Supplied as a service item for TRF421 vehicles, this Upper Deck R is suitable for restoring original fitment or for adjusting component placement in setup cycles.