Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 5.43:1 Ratio

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly is a precision-engineered differential component designed for Ford 9-inch rear axles. This aluminum third member features a 28-spline helical gear configuration with a 5.43:1 gear ratio, delivering responsive power delivery and optimized performance for high-torque applications. The helical gear design reduces noise and wear while improving load distribution across the gear mesh.

This third member assembly is engineered for compatibility with Ford 9-inch differential housings and is ideal for custom builds, restoration projects, and performance upgrades where precision gear ratio and durability are critical. The aluminum construction keeps unsprung weight to a minimum, supporting better handling and acceleration response. Whether you're building a street rod, classic muscle car, or track-focused vehicle, this LSD (limited-slip differential) member provides the gear ratio and load-carrying capability needed for dependable performance.

Key Features & Benefits

• Helical Gear Design: Helical gearing reduces noise and friction while improving load distribution for smoother, more efficient power transfer.
• 28-Spline Configuration: Standard 28-spline connection for direct compatibility with Ford 9-inch axle assemblies.
• 5.43:1 Gear Ratio: Aggressive ratio optimized for torque multiplication and performance in custom and high-powered applications.
• Aluminum Construction: Lightweight aluminum body reduces unsprung weight while maintaining structural rigidity and durability.
• LSD Functionality: Limited-slip differential operation improves traction and power delivery during acceleration and cornering.

Specifications

Ideal Applications

• Custom hot rod and muscle car builds with aggressive acceleration demands
• Classic and vintage Ford vehicle restoration with performance upgrades
• Off-road and trail vehicle differentials requiring enhanced traction control
• Street performance applications demanding improved torque multiplication