Ford 9-inch third members come with three common carrier bearing sizes, which include 2.892-inch (28-spline), 3.062-inch (31- and 33-spline), and 3.250-inch (35- and 40-spline). Larger race ...

31-spline, PN M-4204-F31A, shown). Ford 9-inch rearends have a third "extra" pinion support bearing located at the rear of the drive pinion. Other rearends have only the traditional center two ...

Currie Enterprises offers a selection of Ford 9-inch third members set up for 31-spline axles, which is what you want when you're making a lot of horsepower and torque. This includes a choice of ...

Fortunately for Ford enthusiasts, the 9-inch rear was under just about everything ... Upgrading the factory unit to bigger 31-spline axles helps protect against snapped axles or stripped axle ...