GPM Racing Aluminium 25T Servo Horn W. Built-in Spring (2 Positioning Holes) - 5pcs Set for Traxxas 1/10 TRX4 (TRX4025TA/2H)

Precision 25T aluminium horn for Trail Crawler steering

This aluminium 25T servo horn is intended as an upgrade for TRX-4 style steering systems, offering a robust metal arm with a built-in compression spring to absorb impact loads before they reach the servo gear. The design preserves the 25T spline interface for direct replacement while adding mechanical compliance to reduce shock transmission.

The assembly kit contains the machined aluminium horn, two stainless 3×12 round head screws, an aluminium collar and a 3mm metal washer. Components are supplied for hobbyist installation; confirm spline and shaft compatibility with the target servo prior to final assembly to ensure correct clamping and alignment.

Installation guidance for TRX-4: because the horn incorporates a spring, the arm thickness is greater than a typical plastic equivalent. When fitting to the stock servo mount, reverse the support tie-rod angle to maintain clearance between the thicker horn body and adjacent chassis components. This orientation preserves the front reverse steering gearbox location while preventing contact in specific stock configurations.

Compatible Models

• TRAXXAS TRX-4 DEFENDER
• FORD BRONCO 82046-4
• TACTICAL UNIT-82066-4

What tolerances should I confirm for fitment?

Verify the 25T spline engagement and shaft outer diameter tolerance, and ensure the included collar seats flush to prevent axial play in the servo output.

How does the spring affect load distribution?

The compression spring introduces controlled compliance that dissipates peak impact forces, shifting transient loads away from gear teeth and into the horn assembly instead.

Are there any assembly torque recommendations?

Use moderate torque on the 3×12 screws to clamp the horn securely without deforming the collar; recheck clearance and steering sweep after final torqueing to confirm correct alignment. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.