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 ...

So if simple math wasn't your thing in school, then narrowing a Ford 9-inch at home might not be the job for you. But if you're the type of hot rodder who likes a challenge, then this old-school ...

Why has the Ford 9-inch axle become the go-to axle for Ultra4 racing and hardcore use? It has a lot to do with the evolution of the axle assembly from the factory-built unit, to custom-fabricated axle ...