4.44 Ratio 9in Ford

The Richmond 4.44 Ratio 9-inch Ford Ring and Pinion Kit is a complete differential gearing solution engineered for vehicles running a Ford 9-inch rear axle. This 4.44 ratio configuration delivers substantially higher final drive multiplication than stock, converting engine power into increased wheel torque at the cost of higher engine RPM at highway speeds. The kit features a 28-spline pinion shaft, matching the standard Ford 9-inch architecture, and includes both the ring gear and pinion gear necessary for full differential assembly or rebuild.

A 4.44 ratio is typically deployed in performance, off-road, or towing applications where maximum acceleration and load-carrying capability take priority over top-speed efficiency. The higher numerical ratio increases mechanical advantage, reducing wheel slip under hard acceleration, improving traction on loose surfaces, and providing superior pulling power for trailer or payload work. The 28-spline pinion is the industry standard for Ford 9-inch differentials, ensuring compatibility with widely available bearing sets, seals, and installation hardware. At 18.21 lbs, this kit represents the core drivetrain component for any serious Ford 9-inch build or repair.

This gear set suits builders upgrading to increased performance capability, off-road enthusiasts managing variable terrain, towing operators handling consistent heavy loads, or restoration shops rebuilding classic and modern Ford rear axles. Whether installed in a street performance vehicle, utility truck, or dedicated off-road rig, the 4.44 ratio transforms the driving characteristics by prioritizing acceleration and torque multiplication. The Richmond brand is recognized in the differential component market for precision manufacturing and proper heat-treatment of gear tooth surfaces to withstand shock loads and sustained power transmission.