TRX-4 25T Aluminium Servo Horn with Built-in Spring - TRX4025TA/4H by GPM  [TRX4025TA/4H]

25T Aluminium Servo Arm with Built-In Spring for TRX-4

This 25T aluminium servo arm is a scale-oriented steering upgrade for TRX-4 chassis, designed to enhance directional control on rough terrain. A stainless spring inside the arm helps absorb impacts and lower peak loads on the servo gearing, and multiple tie rod mounting holes let you tune steering geometry without altering link lengths.

The supplied items are: servo horn (1 pc), stainless steel round head screw 3x12 (2 pcs), aluminum collar (1 pc), and 3mm metal washer (1 pc). The hardware is arranged for a direct replacement where the TRX-4 servo spline and mounting match.

Installation advice for TRX-4 cars: the internal spring increases the horn thickness, which can affect clearance when mounted in the stock servo location. If you fit it in the original position, reverse the support tie rod angle to recover space while maintaining the reverse steering gear setup. Always confirm spline fit and steering link geometry before final torqueing.

Tuning advantages: the integrated spring provides controlled give to dampen sudden loads and reduce gear shock, and the selectable tie rod holes enable quick adjustments to toe and steering throw. Choose this horn when you want a more forgiving steering interface for scale trails and technical sections.