GM 12-Bolt Billet Alum. Caps

The GM 12-Bolt Billet Aluminum Caps from STRANGE are precision-engineered differential main caps designed for GM 12-bolt differential applications in high-performance and heavy-duty vehicles. These caps are essential components for anyone rebuilding, servicing, or upgrading a GM 12-bolt rear end, whether for street performance, off-road use, or competition applications. Machined from billet aluminum and finished in natural (uncoated) form, they deliver the strength and reliability demanded by serious enthusiasts and professional mechanics.

Billet aluminum construction provides superior material integrity compared to cast alternatives, offering better resistance to stress concentration and micro-fracturing under extreme loading conditions. The differential main caps clamp the carrier bearings and maintain precise preload geometry critical to differential function, bearing life, and gear mesh quality. STRANGE's design ensures proper seat surfaces and bolt hole alignment, with all necessary hardware included for installation. The natural finish allows for custom coating or anodizing if desired, while providing excellent machinability for any custom modifications or port work required during differential assembly or refresh.

These caps are ideal for differential builders, restoration shops, and performance enthusiasts tackling GM 12-bolt rebuilds on vehicles ranging from classic muscle cars to modern performance trucks. Proper cap installation is critical—bolt torque sequence and preload specifications must follow manufacturer guidelines to ensure bearing health and differential longevity. The pair includes all hardware needed, eliminating sourcing headaches during your build. Whether you're doing a complete differential refresh, upgrading to a performance gear set, or replacing damaged factory components, the GM 12-Bolt Billet Aluminum Caps deliver OEM-compatible precision in an aftermarket package.