GPM Racing Hardened Steel #45 Front Drive Cup - 4pcs Set for Traxxas 1/7 Unlimited Desert Racer-85076-4 (UDR039S)

Precision front drive cup for TRAXXAS UDR

The GPM UDR039S front drive cup is a precision upgrade designed for the TRAXXAS Unlimited Desert Racer differential outputs. These cups locate on both front sides of the differential and transmit torque from the driveline to the axle interfaces, so accurate dimensions and hardened material are important to minimise wear and maintain concentricity under load.

Manufactured from hardened steel #45, each cup resists surface wear and cyclic fatigue better than softer factory parts. The supplied kit contains drive cup 2pcs and stainless steel cap head screw 2.5x12 2pcs for secure mounting, allowing a direct replacement when original cups show degradation.

Technical fit notes: install cups on the front differential outputs, ensure full seating and axial alignment, torque the 2.5x12 cap head screws to a controlled value to avoid compressive distortion, and verify endfloat and runout after initial bench testing and a short track session. Upgrading to hardened steel cups reduces interface wear and preserves driveline geometry during sustained heavy use.

Specifications

• Item: Front Drive Cup (mounts on both front sides of differential)
• Material: Hardened steel #45
• Model Number: GPM UDR039S
• Compatibility: TRAXXAS UNLIMITED DESERT RACER

Aimed at hobbyists seeking a durable, precisely machined replacement to restore driveline reliability and reduce wear on TRAXXAS Unlimited Desert Racer front outputs.

This item is compatible with

• TRAXXAS E-REVO VXL

What hardware is supplied for mounting?

The kit includes two hardened steel drive cups and two stainless steel 2.5x12 cap head screws for secure installation.

How should I check alignment and runout?

Visually confirm concentric seating, rotate the assembly to detect binding or wobble, and address any axial play before full-power testing.

Are these compatible with stock UDR front differentials?

Yes, they are specified for installation on the front outputs of the TRAXXAS Unlimited Desert Racer as a performance-minded aftermarket replacement.

Recommended tightening approach?

Use a calibrated driver, apply a moderate torque to secure screws without compressing seating faces, and re-torque after a brief run to confirm stability. 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.