Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 5.83:1 Ratio

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly is a high-performance differential carrier designed for Ford 9-inch differentials. This third member assembly features a helical gear configuration and a 5.83:1 gear ratio, delivering optimized power transmission for street and performance applications. The aluminum construction reduces weight while the helical gear design minimizes noise and improves load distribution.

Built with the 28-spline specification and limited-slip differential (LSD) technology, this assembly is engineered for drivers seeking reliable torque delivery and smooth gear engagement. The 5.83:1 ratio is well-suited for applications requiring strong low-end acceleration and mid-range performance. This third member assembly is compatible with Ford 9-inch differential housings and serves as a complete replacement or upgrade component for classic and modern performance vehicles.

Key Features & Benefits

• Helical Gear Design: Helical gear configuration reduces noise and improves load distribution during power transmission.
• 28-Spline Configuration: 28-spline setup ensures secure engagement and compatibility with Ford 9-inch differential systems.
• 5.83:1 Gear Ratio: Optimized ratio delivers strong acceleration and responsive torque delivery for performance driving.
• Aluminum Construction: Lightweight aluminum material reduces overall assembly weight without compromising durability.
• Limited-Slip Differential: LSD technology provides balanced torque distribution between wheels for improved traction and handling.

Specifications

Ideal Applications

• Classic and modern Ford performance vehicle differentials
• Street and racing applications requiring aggressive gear ratios
• Acceleration-focused builds with Ford 9-inch differential housings
• High-torque power transmission in modified or performance vehicles