TRX-4 25T Aluminium Servo Arm with Shock Spring - TRX4025TA/4H by GPM  [TRX4025TA/4H]

25-Tooth Aluminium Servo Arm Designed for TRX-4

This 25-tooth aluminium servo arm is intended as a scale-friendly steering upgrade for TRX-4 based crawlers, improving wheel control on rough lines. A stainless coil spring inside the arm cushions sudden impacts to help protect the servo, and multiple tie rod holes let you fine-tune steering geometry without swapping the servo horn.

Included in the package 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 set is arranged for direct replacement where the TRX-4 spline and mounting match.

Installation tips for TRX-4 platforms: the internal spring gives the arm a thicker profile that might limit clearance in the stock servo location. If clearance is tight when fitted in the original spot, flip the support tie rod angle to create space while leaving the front reverse steering gear position intact. Check spline alignment and link geometry before final clamping.

Tuning notes: the integrated spring provides measured compliance to absorb abrupt loads and reduce gear shock, and the selectable hole positions let you change steering throw and toe without altering link lengths. Use this part when you need a gentler steering connection for technical lines and scale events.