Tamiya TRF421 Upper Deck R Hop-Up Part 3404176  [3404176]

Upper Deck R Compatible with TRF421 Series

The Tamiya 3404176 Upper Deck R is intended for the TRF421 chassis family and is listed in relation to the 42391 TRF421X reference. Serving as the upper plate, it occupies the top mount position on the TRF421 chassis and is provided for replacement or as a spare for that area.

Its role is primarily to locate upper links and provide defined mounting points that contribute to chassis geometry and setup. When used during tuning sessions, the deck positions suspension and radio components without altering other chassis elements.

Fitting is straightforward for anyone familiar with TRF-style assemblies: remove the body and any electronics that block access, remove the old deck fasteners, fit the replacement, and torque screws to the vehicle specification. Standard hex drivers are sufficient.

For workshop maintenance, ensure mounting faces are clean and inspect screws and captive nut seating before final assembly. Reuse original hardware if it remains serviceable.

Offered as a service and tuning component for TRF421 models, this Upper Deck R is suitable for restoring original setup or fine-tuning component placement.