Pinion Nut GM 7.5 8.5

The Pinion Nut GM 7.5 8.5 from Allstar Performance is a precision-engineered fastener designed specifically for GM 10-bolt rear differentials found in countless street machines and performance builds. This component secures the pinion gear assembly to the pinion shaft, making it a critical structural element in your differential's load path. Whether you're rebuilding a classic muscle car, servicing a modern performance truck, or assembling a custom rear end, a quality pinion nut is non-negotiable for safety and longevity.

Manufactured from hardened steel with a black oxide finish, this pinion nut resists corrosion and provides the strength needed to withstand the rotational forces and shock loads typical in high-performance driving. The black oxide coating not only extends service life in harsh underbody environments but also matches OEM appearance standards. Allstar Performance's specification covers both 7.5-inch and 8.5-inch ring gear applications within the GM 10-bolt family, offering versatility across model years and build configurations. Proper torque application and often a locking mechanism (such as a cotter pin or lock washer) ensure the nut remains secure during operation, preventing catastrophic differential failure.

Technicians and builders working on second-generation Camaros, Novas, pickups, and other vehicles equipped with GM 10-bolt differentials will find this fastener essential during differential service, rebuild, or upgrade work. Installation requires removing the driveshaft and pinion yoke, then securing the nut with appropriate torque specs (typically 160–210 ft-lbs depending on application) and safety wire or cotter pin. Keep one on hand as a replacement when servicing aged differentials, or stock several for a complete rebuild kit. Compatibility with both 7.5 and 8.5 ring gear sizes makes this a flexible solution for diverse GM rear-end configurations.