Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 3.50:1

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly with 3.50:1 ratio is a high-performance differential component designed for Ford 9-inch rear axles. This precision-engineered third member features a helical gear configuration and limited-slip differential (LSD) design, offering improved traction and handling characteristics for street, strip, and track applications. The 28-spline configuration and aluminum construction provide durability and weight efficiency.

This assembly is engineered for vehicles running Ford 9-inch differentials where a 3.50:1 gear ratio is desired. The helical gear design reduces noise and vibration compared to spur gears, while the LSD mechanism helps distribute torque more evenly between wheels under acceleration and cornering. Ideal for hot rods, muscle cars, street machines, and performance vehicles seeking reliable gear ratio and traction control, this component is suitable for both experienced builders and restorations requiring OEM-compatible fit and function.

Key Features & Benefits

• Helical Gear Design: Helical gears provide quieter operation and reduced vibration compared to traditional spur gear differentials.
• Limited-Slip Differential: LSD mechanism improves traction by distributing torque more evenly between both rear wheels during acceleration.
• 28-Spline Configuration: 28-spline axle shaft interface ensures secure engagement and compatibility with Ford 9-inch rear ends.
• Aluminum Construction: Lightweight aluminum material reduces overall weight while maintaining structural integrity and durability.
• 3.50:1 Gear Ratio: Fixed 3.50:1 ratio balances acceleration and top-speed performance for street and performance driving.

Specifications

Ideal Applications

• Hot rod and custom muscle car rear axle upgrades
• Street performance and drag racing differentials
• Ford 9-inch rear-end restorations and rebuilds
• High-performance street machine traction enhancement