Cobra Racing Traxxas X-Maxx / XRT Helical Differential Set (F+R) – Complete

Upgrade the entire front and rear drivetrain of your Traxxas X-Maxx or XRT with the Cobra Racing Complete Helical Differential Package. Built for high-power bashing, oversized tires, hard launches and demanding 6S/8S setups, this package replaces the major differential components as a matched system instead of upgrading only the ring and pinion gears.

CNC-machined 7075-T6 aluminum differential housings provide a rigid foundation, while hardened-steel spiral-cut/helical ring and pinion gears are designed for smooth, consistent power transfer under heavy load. Rubber-sealed bearings and included differential output cups complete the package.

1. Why Upgrade to Helical Differentials?

Large-scale X-Maxx and XRT drivetrains place tremendous load on the front and rear differentials. This upgrade is ideal for drivers running:

• High-power 6S and 8S setups
• Oversized or heavier tires
• Aggressive off-road bashing and jumping
• Repeated hard acceleration and braking
• Modified or higher-output power systems
• Trucks that regularly damage or wear factory differential components

The spiral-cut gear design provides increased tooth engagement compared with traditional straight-cut gearing, helping distribute drivetrain loads across the gear surface while delivering smooth power transfer.

2. Built for Strength

The Cobra Racing differential assemblies combine several drivetrain upgrades into one complete package:

• CNC-machined 7075-T6 aluminum differential housings
• Hardened-steel spiral-cut/helical differential ring gears
• Matching front and rear differential pinion gears
• Heavy-duty internal differential components
• Front and rear differential output cups
• Rubber-sealed ball bearings
• Blue anodized aluminum finish
• Complete front and rear differential assemblies

Rather than rebuilding worn factory differentials one component at a time, this kit gives you a complete matched front-and-rear drivetrain upgrade.

Compatible Traxxas Models

Compatible with the X-Maxx/XRT differential platform, including:

• Traxxas X-Maxx 6S – 77076-4
• Traxxas X-Maxx 8S – 77086-4
• Traxxas X-Maxx 8S – 77096-4
• Traxxas X-Maxx Ultimate – 77097-4
• Traxxas XRT 8S – 78086-4
• Traxxas XRT Ultimate – 78097-4

What’s Included

• 1 × Complete front helical differential assembly
• 1 × Complete rear helical differential assembly
• 1 × Front differential pinion gear
• 1 × Rear differential pinion gear
• Front and rear output cups
• Rubber-sealed differential bearings