Ford 9in Axle 31 Spline 29-1/2in

The Ford 9in Axle 31 Spline 29-1/2in from ALLSTAR PERFORMANCE is a high-quality replacement axle shaft designed for serious street, strip, and off-road applications where reliability and durability matter. Built as a direct replacement for Ford 9-inch differentials, this axle delivers the strength and precision needed for high-performance builds, drag racing, and heavy-duty modifications.

The 31-spline design provides superior load capacity and torque handling compared to older 28-spline configurations, essential when running larger tires, aggressive gear ratios, or forced induction. The 29-1/2-inch length is engineered to fit stock and slightly modified Ford 9-inch housings without modification, ensuring proper brake drum or rotor clearance and correct axle geometry.

This axle shaft is ideal for restomod builds, classic muscle car projects, independent rear suspension conversions, and any application demanding bulletproof driveline components. Installation requires proper bearing preload, carrier setup, and break-in procedures—tasks best handled by experienced technicians.