TRF421 Upper Deck R Replacement - Tamiya 3404176  [3404176]

Top Plate R for TRF421X

The Tamiya 3404176 Upper Deck R is a purpose-made component for the TRF421 line identified by 42391 TRF421X. Fitted at the upper mounting point of the TRF421 chassis, it serves as the top structural plate and is supplied for direct replacement or as a spare for that mounting area.

Functionally, this upper deck secures the upper suspension links and provides fixed mounting points that influence chassis geometry and setup. As part of routine tuning it establishes the relative positions of suspension and radio gear without changing other chassis parts.

For installation, follow standard TRF421 procedures: remove the body and any obstructing radio equipment, undo the current upper deck fasteners, exchange the part, and tighten screws to the original torque values. No special tools beyond typical hex drivers are needed for fitting.

For maintenance during bench work, make sure mounting surfaces are free of debris and verify screw threads and captive nut alignment before final assembly. Keep original hardware unless the vehicle setup calls for replacements.

This Upper Deck R is supplied as a service or tuning item for TRF421-series cars and is useful when restoring factory layout or refining component placement during setup work.