Upgrade for 42391 TRF421X: 13.0mm Steering Post - Tamiya 9803477  [9803477]

Steering Post Features and Fit

This Tamiya 9803477 13.0mm steering post is supplied as a single machined shaft intended for the 42391 TRF421X reference. It functions as the pivot connecting steering components to the front uprights, helping preserve neutral steering and responsiveness during adjustments.

Precision machining and material selection are key to consistent steering feel; this aluminium alloy post replaces worn parts and supports setup changes where low play is desired. Confirm compatibility with part code 42391 TRF421X before fitting.

Fitting guidance: remove the front assembly in line with your chassis manual, examine bearings and hexes for wear, slide the post into place and secure with your existing bolts. Do not force components; correct alignment prevents binding and promotes predictable steering geometry.

Tuning impact: swapping to a well-made steering post can reduce play in the linkage, improve toe and Ackermann response, and yield more repeatable steering behaviour across runs.

Use as a planned maintenance item or as part of a tuning sequence when precise steering control is required on 1/10 scale touring car platforms.