Description
Upgrade your rear axle with the Alien Machine Worx GM 10-Bolt Billet Differential Cover for 8.5″ & 8.6″ Ring Gear Rear Axles. Every cover starts as a solid block of 6061-T6 billet aluminum and is precision CNC machined in-house in the USA to deliver exceptional strength, durability, and an OEM-quality fit.
Designed specifically for GM Corporate 10-bolt rear axles with 8.5-inch and 8.6-inch ring gears, this billet differential cover replaces the factory stamped-steel cover with a stronger, more rigid design and a clean, aggressive machined appearance. The GM 8.6-inch axle is an evolution of the original 8.5-inch platform, allowing this cover to fit both applications while maintaining the strength, quality, and performance expected from Alien Machine Worx.
Features
- CNC machined from solid 6061-T6 billet aluminum
- Precision machined in-house in the USA
- Designed for GM 8.5-inch and 8.6-inch 10-bolt rear axles
- Strong, rigid billet construction
- Integrated fill plug
- Integrated drain plug for easier fluid changes
- Built for daily driving, street performance
- Includes both M8 × 1.25 and 5/16″-18 stainless steel mounting hardware for broad GM 8.5/8.6 axle compatibility.
Important Fitment Information
Please identify the axle before ordering. GM used several different 10-bolt axles, including 7.5/7.625-inch, 8.2-inch, 8.5-inch, and 8.6-inch versions. A vehicle being described as having a “GM 10-bolt” does not by itself confirm fitment.
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