Speedmaster Ford 9" 28 Spline 4.11:1 Ring and Pinion Gear Set 8620 PCE211.1005

The Speedmaster Ford 9" 28 Spline 4.11:1 Ratio Ring and Pinion Gears Set is a high-performance differential gear package engineered for Ford 9-inch rear ends. This set delivers a 4.11:1 final drive ratio, offering aggressive acceleration for street and performance applications while maintaining drivability. The gears are manufactured from 8620 steel, a premium alloy chosen for its strength and durability under high-load conditions common in modified and racing vehicles.

Designed with 28-spline shafts, this ring and pinion set is a direct replacement for Ford 9" differentials requiring this specific spline count and ratio. The 4.11:1 gearing is ideal for enthusiasts seeking improved low-end torque response and quicker acceleration, making it a popular choice for street rods, muscle cars, and performance builds. Installation into compatible Ford 9-inch housings is straightforward when using proper tools and procedures, and the precision manufacturing ensures smooth, quiet operation once properly backlashed and installed.

Key Features & Benefits

• 8620 Steel Construction: Premium alloy material delivers superior strength and fatigue resistance for high-performance use.
• 4.11:1 Ratio: Aggressive gear ratio optimizes acceleration and low-end torque response.
• 28-Spline Design: Fits Ford 9" differentials with 28-spline shaft configuration.
• Ring and Pinion Set: Complete gear package for full differential replacement or upgrade.

Specifications

Ideal Applications

• Street rod and muscle car differential upgrades
• Performance and racing vehicle rear-end builds
• Ford 9-inch differential replacements requiring 4.11:1 ratio
• Modified vehicles seeking improved acceleration