Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 4.88:1 Ratio

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly delivers high-performance differential components engineered for Ford 9-inch rear ends. This precision aluminum assembly features a helical gear design with a 4.88:1 ratio, providing optimized power delivery and torque characteristics for performance and heavy-duty applications. The 28-spline configuration ensures secure engagement and compatibility with Ford 9-inch third member housings.

Built for reliability in demanding driving conditions, this LSD (limited-slip differential) third member assembly supports both street and track use. The helical gear design reduces noise while improving load distribution across the gear teeth. Installation requires proper understanding of differential assembly procedures, making it ideal for automotive enthusiasts, restoration specialists, and performance shops working with classic and modern Ford 9-inch rear ends.

Key Features & Benefits

• Aluminum Construction: Lightweight aluminum build reduces unsprung weight while maintaining structural integrity.
• 28-Spline Design: Precision 28-spline configuration ensures proper fit and engagement in Ford 9-inch housings.
• 4.88:1 Ratio: Performance-optimized gear ratio provides strong low-end torque delivery.
• Helical Gear Technology: Helical tooth design minimizes noise and improves gear durability under load.
• LSD Functionality: Limited-slip differential provides power distribution to both wheels for improved traction.

Specifications

Ideal Applications

• Ford 9-inch rear end assembly and rebuild
• Performance and racing differential upgrades
• Classic and hot rod restoration
• Heavy-duty traction enhancement