GPM Racing Aluminium Rear Spring Dampers (139mm) for Traxxas 1/7 Unlimited Desert Racer-85076-4 (UDR139R)

Rear aluminium damper kit for TRX UDR

This rear spring damper kit is engineered for the TRAXXAS Unlimited Desert Racer platform. Two aluminium-bodied rear dampers are supplied to reduce internal friction and manage impact loads, promoting a more controlled rear end during off-road operation.

The specification increases coil wire thickness from 1.8mm to 2mm while maintaining compatibility with standard springs for tuning flexibility, and ups the shock shaft from 3.5mm to 5mm to improve resistance to bending under load. The aluminium cylinder and tightly seated spring retainer are intended to limit oil seepage during repeated service cycles.

These dampers are recommended where firmer rear damping is required for coarse surfaces and high-speed desert runs. Installation follows common shock service steps and tuning uses shock oil grades, spring selection and preload settings to achieve the desired ride height and damping characteristic.

Specifications

• Item: Rear spring dampers set, 2 pcs
• Material: Aluminium cylinder with metal shock shafts
• Model Number: GPM UDR139R
• Compatibility: TRAXXAS UNLIMITED DESERT RACER
• Shaft Diameter: 5mm (thickened from 3.5mm)
• Spring Wire Diameter: 2mm (thickened from 1.8mm)

Suitable for builders needing a robust rear damping solution on the TRAXXAS UDR, these aluminium dampers offer thicker shafts and springs while retaining familiar maintenance and tuning procedures.

Fitment – do these use stock mounting points?

Yes, they are designed to install on the TRAXXAS Unlimited Desert Racer using the existing rear shock mounting hardware and locations.

Spring compatibility for tuning?

Standard spring sizes are supported so you can use OEM or aftermarket springs to fine tune spring rates and ride height.

Seal maintenance recommendations?

Regular inspection of the spring retainer and seals, cleaning before reassembly and using the correct shock oil will help prevent leakage and extend service intervals.

Effect of 5mm shaft on shock performance?

A 5mm shaft reduces flex under load, which supports more consistent damping behaviour and improved durability in heavy use scenarios.

Service tools and procedure overview?

Use basic shock service tools such as hex drivers and a shock clamp; follow standard strip, inspect, replace seals if needed, refill with chosen shock oil and reassemble to set preload and ride height. 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.