Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 4.56:1

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly (4.56:1) is a premium differential component designed for high-performance Ford 9-inch rear axle systems. This helical gear third member features an aluminum construction with 28-spline engagement and a 4.56:1 gear ratio, delivering aggressive acceleration and torque management for modified and racing applications. The LSD (Limited-Slip Differential) design improves traction and cornering stability by distributing power intelligently between wheels.

Ideal for street, strip, and track use, this third member assembly is engineered for builders seeking reliable power transmission in custom Ford 9-inch installations. The helical gear profile ensures smooth, quiet operation under load, while the aluminum housing keeps weight down for improved performance. Compatible with Ford 9-inch rear axle platforms, this assembly simplifies differential upgrades and delivers the durability required for serious enthusiasts and professional builds.

Key Features & Benefits

• Helical Gear Design: Smooth, quiet power transmission with reduced noise under acceleration and load.
• LSD Technology: Limited-slip differential improves traction and distributes torque between wheels for enhanced cornering stability.
• 4.56:1 Gear Ratio: Aggressive ratio designed for quick acceleration and high-performance street and track applications.
• 28-Spline Engagement: Precision spline count ensures secure, repeatable fitment in Ford 9-inch housings.
• Aluminum Construction: Lightweight housing reduces overall rear axle weight for improved handling and efficiency.

Specifications

Ideal Applications

• High-performance street and strip racing builds
• Custom Ford 9-inch rear axle upgrades
• Track day and competition vehicles
• Modified muscle cars and hot rods