Mini Spool GM 7.5in 28 Spline

The Motive Gear Mini Spool GM 7.5-inch 28 Spline is a precision differential component engineered for GM 10-bolt rear axle assemblies. This mini spool replaces the factory spider gears, converting the differential into a locked or semi-locked design that delivers consistent power delivery to both wheels. Steel construction and OEM-grade manufacturing ensure reliability in high-demand off-road, towing, and track applications where standard open differentials create traction loss.

At 7.5 inches in diameter with 28 spline engagement, this spool is purpose-built to fit GM 10-bolt housings without modification. The 28 spline design ensures proper mesh with OEM axleshafts, eliminating compatibility guesswork. Weighing 4.44 pounds and measuring 5.4 x 5.1 x 6.15 inches, the spool installs cleanly within the carrier bore. The steel construction resists shock loads common to rock crawling, mudding, and heavy towing, where spider gear failure under torque is a known weak point in factory differentials.

This spool serves serious off-road builders, truck enthusiasts, and operators running modified powerplants or adding weight through armor or recovery equipment. Anyone who has lost traction in a side-hill or high-torque situation understands the value of locked axle performance. Unlike welded differentials, a quality mini spool like this one provides the locking benefits with less parts stress and cleaner installation. It's a direct-fit upgrade for stock GM 10-bolt trucks, Blazers, and SUVs, and works seamlessly with existing brake and driveline components once properly installed and geared.