Description: 100% Brand New and High Quality High-Quality Composite Clutches Compatible Gear Ratios: Any Axle Splines: 30 New Chrysler Mopar 8-3/4" Sure-Grip / Power-Lock Posi Unit - 30 Spline Clutch-Style Posi Unit Fits 741, 742, & 489 Cases Heavy-Duty 2-Piece Case w/ 6 Forged Internal Gears 100% Re-Buildable Requires 25590 Bearing & 25520 Race Application for: For Chrysler 8-3/4 - 8.75 -30 Spline OE Number: C8.75-PL-AGRS-30 Package Include: 18.75" Ford Posi Unit - 30 Spline Limited-Slip Locker.