Strange S-Trac Differential Fits 9″ Ford With 35 Spline Axles Requires Aftermarket 3.250″ Bore Case

Strange Helical Differential For Ford 9in The Strange 35 Spline S-Trac Differential is a helical differential that offers smooth and progressive power transfer. Its superior design and quality make it ideal for the most abusive Street/Track applications. The torque biasing S Trac Differential is purely mechanical which eliminates the need for clutches. It provides quiet operation while maximizing tire traction and vehicle acceleration. The Strange Helical Differential Built with forged steel case halves that are heat treated and fully machined to minimize weight and provide a rigid mounting surface for the ring gear resulting in improved gear life. Internal gear pocket geometry is designed to minimize stress risers increasing component life. The housing encapsulates precision manufactured gears, including 9310 steel pinion gears, that provide exceptional strength. All internal gears, pinion and side gears, are vacuum heat treated to increase strength and also cold treated to extend ser