TRAXXAS UNLIMITED DESERT RACER Aluminum Rear Spring Dampers 139mm by GPM UDR139R  [UDR139R]

Aluminum rear spring dampers for TRX UDR

This is an RC-scale rear spring damper set designed for the TRAXXAS Unlimited Desert Racer platform. The kit supplies two aluminum-bodied rear dampers intended to reduce internal friction and absorb impact loads so the vehicle rides with improved balance during off-road running.

The components follow a straightforward upgrade path: coil wire thickness is increased from 1.8mm to 2mm while retaining compatibility with original springs if a different rate is preferred, and the shock shafts are increased from 3.5mm to 5mm to resist bending under load. The cylinder body is aluminum and the spring retainer is designed to seal tightly to limit oil leakage during operation.

In practice these parts are used where sturdier rear damping is required for rough surfaces and higher-speed desert runs. Installation requires basic shock disassembly and reassembly, and tuning remains the same process using shock oil, springs, and preload adjustments to match ride height and damping feel.

For builders seeking a firmer rear damping package for the TRAXXAS UDR, these aluminum rear dampers provide thicker shafts and springs while keeping installation and tuning procedures familiar to standard shock service.