Spool Cross Pin GM 12 Bolt

The Spool Cross Pin GM 12 Bolt is a precision differential component engineered for heavy-duty performance in General Motors 12-bolt rear axle assemblies. This steel cross pin serves as the critical pivot shaft in the differential carrier, enabling the side gears and spider gears to rotate independently while distributing torque between the drive wheels. Fabricated to exacting OEM specifications, this component is essential for anyone rebuilding or maintaining a GM 12-bolt differential, whether for street performance, off-road capability, or restoration work.

Manufactured from hardened steel and sized for the 8.875-inch ring gear configuration, the Spool Cross Pin GM 12 Bolt is designed to withstand the axial and rotational forces generated during acceleration, braking, and cornering. The cross pin's precision bore and diameter ensure proper fit within the differential carrier housing, maintaining critical clearances that prevent binding and premature wear. Its compact 4.05-inch length and 0.9-inch diameter profile allow for straightforward installation during differential tear-down and reassembly, eliminating guesswork and compatibility issues.

Rebuilders, restoration specialists, and performance enthusiasts working with GM 12-bolt differentials will find this cross pin indispensable for maintaining differential function and reliability. It is compatible with all 8.875-inch ring gear GM 12-bolt assemblies commonly found in Chevrolet, Pontiac, and Oldsmobile vehicles from the 1960s through 1980s, as well as modern performance applications using vintage or modern 12-bolt housings. Proper installation requires careful alignment and torque specifications during carrier assembly to ensure smooth operation and extended service life.