(Nodular Iron OPEN DIFFERENTIAL Center Section 9" Ford with 31 spline US Gear ring & pinion, Assembled. SPECIFY 2 3/8" or 2 1/2" axle offset for brakes. CHOOSE Rear End Yoke: choose 1310 series (3 7/32" wide with 1 1/16" cap OD) or 1330 series 3 5/8" wide with 1 1/8" cap OD) rear end yoke.
