The Speedmaster 1-215-001-10 is a complete Ford 9-inch third member assembly built around a helical gear limited-slip differential, delivering smooth, automatic torque transfer without clutch packs or aggressive engagement. The lightweight aluminum case helps reduce overall axle weight while the 28-spline configuration and 5.14:1 ring-and-pinion ratio make this unit well-suited for high-torque performance and racing applications that demand a deep gear set.
Designed as a drop-in third member for Ford 9-inch rear axle housings, this assembly offers a ready-to-install solution for street rods, drag cars, and performance builds that rely on the proven Ford 9-inch platform. The helical LSD design requires no special friction-modifier additives and provides consistent, reliable power distribution to both rear wheels under acceleration.
