Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly 4.11:1

The Speedmaster Ford 9 in. Aluminum 28-Spline Helical Gear LSD Third Member Assembly is a high-performance differential component engineered for custom Ford 9-inch rear axles. This limited-slip differential (LSD) third member features a helical gear design with a 4.11:1 ratio and accommodates 28-spline axle shafts, delivering smooth power delivery and reduced wheel slip during acceleration and cornering.

Designed for hot rod, street performance, and racing applications, this aluminum third member assembly replaces the stock differential to provide improved traction and handling. The helical gear configuration offers quieter operation than traditional spur gears while distributing load across more teeth, resulting in greater durability and performance reliability. Compatible with Ford 9-inch axle housings, this assembly simplifies the upgrade process for enthusiasts and performance builders.

Key Features & Benefits

• Helical Gear Design: Helical gearing delivers quieter operation and superior load distribution compared to standard spur gears.
• 28-Spline Shaft Compatibility: Accommodates 28-spline axle shafts for secure fitment in Ford 9-inch housings.
• 4.11:1 Gear Ratio: High-ratio gearing optimized for acceleration and performance applications.
• Limited-Slip Differential (LSD): Reduces wheel slip for improved traction during acceleration and cornering.
• Aluminum Construction: Lightweight aluminum housing reduces unsprung weight for better handling.

Specifications

Ideal Applications

• High-performance and street rod rear axle upgrades for Ford 9-inch housings
• Racing and competition vehicle differentials requiring improved traction
• Hot rod and custom muscle car builds with enhanced acceleration capability
• Performance handling upgrades for enthusiast and drag racing applications