TRX-4 Rear Precision Gearbox Mount and Knuckle Arm Kit TRX4H100R by GPM  [TRX4H100R]

Precision rear gearbox and knuckle assembly for TRX-4

This 54-piece precision upgrade set provides CNC-friendly aluminium replacements for the TRX-4 rear gearbox mounts and knuckle arms. The components include rear box mounts, inner and outer knuckle items, rear axle joint and shaft, spindle gears and a complete set of stainless fasteners designed to retain factory interfaces while offering refined mounting geometry for improved alignment under load.

Engineering and tuning: machined 6061 T6 structural parts reduce flex and maintain gear alignment under heavy crawling. The open knuckle attachment streamlines assembly and the alternate lower shock mounting positions permit repeatable adjustments to damper angle and ride height. The altered knuckle geometry increases gear pitch and diameter and lowers the axle centre by a small margin, lifting body clearance by approximately 1.2mm according to the supplier.

Specified for hobbyists seeking a stiffer aluminium rear mounting solution to control driveline alignment and enable fine shock geometry adjustments on TRX-4 crawlers; verify pendulum wheel clearance and follow torque and installation best practices.