Tamiya 9803477 13.0mm Steering Post for 42391 TRF421X  [9803477]

13.0mm Steering Post Overview

This Tamiya 9803477 13.0mm steering post is a dedicated RC-scale replacement part designed to work with the 42391 TRF421X reference. As a direct steering post component, it serves as the pivot point between the steering assembly and the front uprights, helping maintain steering center and responsiveness during setup changes.

Material construction and precise machining are important for consistent steering feel; this post is supplied as a single machined shaft to replace worn or damaged originals and to support tuning where minimal play is required. Check the original part code 42391 TRF421X for fit verification before installation.

Installation notes: remove the front assembly per your chassis manual, inspect related bearings and hexes for wear, then slide the post into position and secure using the existing fasteners. Avoid forcing components; correct alignment of the post ensures predictable steering geometry and reduces binding under steering loads.

Tuning role: swapping to a correctly sized, well-machined steering post helps eliminate slop in the steering linkage, refines toe and Ackermann response, and contributes to more repeatable lap-to-lap steering behaviour during setup iterations and track testing.

Use this part as a maintenance replacement or as part of incremental chassis tuning where precise steering inputs are required on 1/10 scale touring car setups.