Rear Limited-Slip Locker 19588-010 for Ford 8.8" Posi 31 Spline 10-Bolt Replace Part Number:19588-010, 19588010, YDGF8.8-31-1 Specification:Axle Placement: Rear Axle Spline Count:31 Spline Diameter:1.32"Cover: 10 Bolt Gear Ratio: All Ratios Model:Ford 8.8"Ring Gear Diameter:8.8"Applications:Fit For Ford 8.8" Eaton Heavy-Duty Posi Unit - 31 Spline Fit For 19588-010 Eaton Posi Ford 8.8" 31 Spline Limited Slip