Ford 9 inch rear end 31 spline Source Source Source Source Source Source Source Source Source Source Read Also: Ford 9 inch 28 vs 31 spline Ford 9 inch rear end 28 spline Detroit locker ford 9 inch 28 spline Ford nine inch 28 spline axles 30 Spline ford nine inch 28 Spline vs 31 spline ford rear axle