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

Why This 13.0mm Post Matters

This Tamiya 9803477 13.0mm steering post is crafted as a direct replacement for the 42391 TRF421X reference. It provides the steering pivot between the servo linkages and the front uprights, helping maintain steering neutral and predictable handling under load.

Construction and machining precision influence steering feedback; the post is supplied as a single aluminium alloy shaft to replace aged or damaged originals and to enable tuning where play must be minimised. Verify the 42391 TRF421X part code for correct compatibility prior to installation.

Installation advice: remove the front assembly following your chassis instructions, check bearings and hexes for signs of wear, position the post carefully and secure it with the existing hardware. Avoid forcing components; correct alignment prevents binding and uneven steering response.

Setup benefit: fitting a well-machined steering post helps eliminate free play, refines toe-in and Ackermann characteristics, and supports more repeatable steering response during track testing.

Keep this part on hand for maintenance replacements or incremental chassis tuning where precise steering control is a priority on 1/10 scale touring cars.