Ford 9" 28 Spline Limited-Slip Differential Rebuild Kit

The Speedway Motors 91910028 kit is a complete Ford 9-inch rear-end package designed to combine improved traction, durability, and installation convenience in one assembly. At the heart of the kit is the Speedway 28-spline clutch-style limited-slip differential (91909028), which delivers positive traction to both rear wheels while maintaining smooth, quiet operation for street-driven vehicles. Its spring-loaded clutch pack design provides enhanced grip over traditional OEM-style limited slips without the noise and harsh engagement associated with locker-style differentials. 

To simplify assembly and ensure reliable operation, the kit also includes a 9-inch Ford overhaul kit (9190950), containing the bearings, seals, shims, crush sleeve, gasket, sealant, and setup components needed to properly rebuild and install the center section. This comprehensive package helps save time and eliminates the need to source multiple individual components separately.

Completing the package is a Motive Gear Ford 9-inch performance ring-and-pinion set (919194), precision-manufactured using CNC machining, computer-controlled heat treatment, and quality-controlled tooth spacing for dependable performance and long service life. Customers can select the gear ratio that best matches their application, from cruising-friendly street setups to more aggressive performance combinations. Available ratios include 3.00, 3.25, 3.50, 3.70, 3.89, 4.11, and 4.56

• 28 spline 
• Works with factory 9 inch Ford differential case, gear, axles and bearings
• Spring loaded clutch pack with improved grip over OEM designs 
• Time tested, proven reliability 
• Forged steel case 
• Heat treated spider gears 
• Quiet operation, no clicking when disengaging for corners 
• Ideal for street tires and medium horsepower applications