NEW Center Section MS 5.67 31 Spline 1310

The NEW Center Section MS 5.67 31 Spline 1310 is an assembled differential case designed specifically for Ford 9-inch rear axle applications. Built as a steel spool unit with a 5.67 ratio and 31-spline configuration, this center section delivers the locking characteristics and gear reduction required for high-traction off-road and performance driving scenarios where wheel speed differentiation is not a priority.

The 5.67 ratio provides aggressive gear reduction, multiplying engine torque for improved acceleration and low-speed pulling capability—critical for rock crawling, sand driving, and heavy-load towing applications. The 31-spline interface ensures robust engagement with compatible axle shafts and handles shock loading without slip or damage. As a steel spool design, this center section locks both rear wheels together, providing maximum traction by forcing both tires to rotate at identical speeds. This eliminates axle speed variance, making it the preferred configuration for vehicles operating in low-grip environments or dedicated off-road duty where on-road handling concerns are secondary.

This assembly is ideal for builders and repair shops servicing classic muscle cars, off-road trucks, and performance vehicles that rely on Ford 9-inch axle platforms. The natural finish and pre-assembled state allow for direct installation into compatible 9-inch housings. Weighing 87 lbs and measuring 15 x 15 x 20 inches, this center section is substantial enough for serious drivetrain work and should be handled accordingly during transport and installation. Whether upgrading an existing rear axle or rebuilding after wear, this differential case delivers proven reliability for demanding duty cycles.