Race Reinforced Tamiya 3404157 - TRF421 Upper Deck A Hop-Up Part  [3404157]

Stiffen the TRF421 with Tamiya Upper Deck A

The Tamiya #3404157 Upper Deck A is a precision upgrade made for the TRF421 chassis. Built to tighten chassis flex and add structural strength, this part improves responsiveness and gives a firmer feel on corner entry and exit. It is aimed at hobbyists and racers who want a durable, dependable upgrade for track use.

Track-Focused Stability and Control

Designed to mate cleanly with the TRF421 layout, the Upper Deck A cuts down unwanted flex so the car stays predictable at speed. The added stiffness helps maintain consistent contact patch behavior, assisting smoother turn-in and more stable handling under braking and acceleration.

Suited to Competitive Setups

When race results matter, a strong chassis foundation is important. The Tamiya Upper Deck A helps refine weight balance and supports improved traction and steering precision, making it a practical choice for drivers tuning their TRF421 for competition.