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 ...

It is easier to keep an inventory of Ford 9-inch third members on the shelf with various axle ratios if you're racing and need to change gear ratio. Gear swaps in a 12-bolt are time consuming ...

Service parts for the 9-inch are plentiful and widely available. Most competitive rearends require a differential case change when going to "steep gear ratios," but on the Ford, "one size case ...

Ford's 9-inch rearend was produced from 1957 through ... The advantage increases at lower (high numerical) axle ratios because, compared to milder ratios, the low-ratio gearsets have relatively ...

There was a time when the Ford 9-inch axle was synonymous with strength ... the right combination of housing, carrier, gear ratio, spline count, traction aid, and so on that best suits the ...