Spool 9in Ford 28 Spline

The Spool 9in Ford 28 Spline from ALLSTAR PERFORMANCE is a full-spool differential unit engineered for high-performance Ford 9-inch rear axles. This is the core upgrade for any serious drag racer, circle-track competitor, or street enthusiast running a Ford 9 with 28-spline axle shafts. A spool eliminates the traditional differential entirely, locking both rear wheels together during acceleration to deliver maximum traction and eliminate wheel hop—essential when you need instantaneous power delivery and predictable handling under hard launch.

Machined from steel and built to OEM-equivalent tolerances, the Spool 9in Ford 28 Spline provides a one-piece design that replaces the spider gears and carrier internals of a factory differential. Unlike a limited-slip unit, a full spool provides no speed differentiation between left and right wheels, which means zero slip on acceleration but tighter turning radius off-throttle. The 28-spline interface matches the standard Ford 9-inch aftermarket axle ecosystem, ensuring compatibility with a wide range of high-performance shafts and supporting packages. At 8.3 lbs, this is a precision-machined component built for durability under extreme load conditions typical of competition and high-horsepower street applications.

This spool is ideal for vehicles where straight-line acceleration performance outweighs cornering finesse—drag racing, bracket racing, and dedicated circle-track machines. Installation requires removal of the rear axle housing and disassembly of the differential carrier, making professional installation recommended for builders unfamiliar with Ford 9-inch service procedures. The Spool 9in Ford 28 Spline works with any Ford 9-inch housing and pairs perfectly with modern 28-spline axle shafts from major manufacturers. Verify your carrier code and axle configuration before ordering to ensure proper fitment and performance.