Ford 9" 31 Spline Limited-Slip Daytona Differential Rebuild Kit

The Speedway Motors 91910031S Ford 9 Inch Limited-Slip Daytona Bearing Differential Rebuild Kit combines the key components needed to upgrade or rebuild a Ford 9-inch rear end into one convenient package. This kit includes a Motive Gear performance ring and pinion set, a 31-spline clutch-style limited-slip differential, and a complete overhaul kit with the bearings, seals, shims, hardware, and installation components required for proper setup.

Designed for street, performance, and racing applications, the kit provides improved traction through a clutch-style limited-slip carrier while allowing customers to tailor performance with a choice of gear ratios. Available ratios include 3.00, 3.25, 3.50, 3.70, 3.89, 4.11, and 4.56, making it easy to optimize acceleration, top-speed characteristics, or overall drivability for specific vehicle setups.

The included Motive Gear ring and pinion is manufactured for strength and durability, while the 31-spline clutch-style differential offers smooth, quiet limited-slip operation without the harsh engagement characteristics of a spool or locker. Completing the package, the overhaul kit provides the critical bearings, seals, crush sleeve, shims, sealant, and setup materials needed to streamline installation and ensure reliable performance.

• Ring gear diameter 9"
• 10-7/16" x 20 RH threaded bolts
• Pinion diameter 1.313" 28 splines
• 8620 Material - Heat Treated
• Choose your ratio
• Large "Daytona " inner pinion bearing

9190950-31S

• Carrier bearing # LM603049 (CONE) and LM603011 (CUP) TM88048 (CONE)
• Outer pinion bearing TM88010 (CUP)
• Large "Daytona " inner pinion bearing HM89443 (CONE)
• Race # HM89410 (CUP)
• LM603049 CONE ID: 1.781 "
• LM603011 CUP OD: 3.063 "
• TM88048 CONE ID: 1.308 "
• TM88010 CUP OD: 2.687 "
• HM89443 CONE ID: 1.308 "
• HM89410 CUP OD: 3.00 "