Speedmaster Ford 9" 28 Spline 4.88:1 Ratio Ring and Pinion Gears Set 8620 PCE211.1007

The Speedmaster Ford 9" 28 Spline 4.88:1 Ratio Ring and Pinion Gears Set (PCE211.1007) is a precision-engineered differential gear assembly designed for Ford 9-inch rear axles. Built from 8620 steel, this ring and pinion gear set delivers durability and consistent performance in high-demand drivetrain applications. The 4.88:1 gear ratio provides aggressive acceleration and torque multiplication, making it ideal for performance vehicles, street rods, and muscle car builds where lower gearing enhances off-the-line power delivery.

With 28-spline engagement, this gear set ensures secure meshing and reliable load distribution across the contact surfaces. The 8620 alloy steel construction offers excellent fatigue resistance and strength, critical for vehicles that see frequent hard driving or towing loads. This ring and pinion assembly is engineered to drop directly into compatible Ford 9-inch rear differentials, replacing the stock or worn gears with a precision-matched set that restores or enhances differential performance and efficiency.

Key Features & Benefits

• 4.88:1 Gear Ratio: Aggressive ratio designed to increase torque multiplication and acceleration from a standstill.
• Ford 9" Bolt Circle: Direct fit for Ford 9-inch rear axle differentials on compatible vehicles.
• 28-Spline Engagement: Ensures secure load distribution and reliable gear meshing under load.
• 8620 Alloy Steel: Forged from 8620 steel for superior fatigue resistance and durability in high-performance applications.
• Complete Ring & Pinion Set: Matched pair ready to install as a complete assembly into the differential carrier.

Specifications

Ideal Applications

• High-performance street and muscle car builds requiring aggressive low-end torque
• Ford 9-inch rear differential rebuilds and upgrades on classic or performance vehicles
• Custom rod and hot rod projects needing optimized acceleration gearing
• Performance vehicles or restorations where improved off-the-line power delivery is desired