Look under most Ultra4 cars and you will likely find some variation of the Ford 9-inch axle assembly. However these axles are far from factory units. The Ford 9-inch does have a few features that ...

For over half a century, the Ford 9-inch rearend has been the king of aftermarket axle upgrades. Few other axles enjoy the same amount of bolt-on and custom componentry. The Ford 9-inch is a great ...

Without a doubt, Ford's 9-inch axle assembly has been the No. 1 choice for a performance rearend for a long time. The reasons were obvious enough—they were strong, plentiful, and affordable. A wide ...

There was a time long ago when you had to hit the junkyard if you needed the strength, reliability, and easy gear-changing convenience of a Ford 9-inch rear axle. They were dark days, indeed. But in ...