Modified Mustangs & FordsHow To Drivetrain
Currie Enterprises Differentials - Traction Action
We take a look at what's offered for Ford's removable carrier differentials
The pinion support is another weak link not enough of us pay attention to. The pinion support fits into the nose of the gearcase and, as its name implies, supports the pinion gear and bearings. The 9-inch Ford was a well-equipped pinion support-wise from the factory. However, the more stable we can keep the pinion, the longer your 9-inch will live. Currie has a couple of nice options for rearend builders.
Currie's 9-Plus pinion support replaces the stock 9-inch pinion support. Not only does it fit your factory 9-inch case, it fits virtually all 9-inch cases. You can abuse this piece with up to 350 hp. A stronger, heavy-duty pinion support is also available from Currie with 50-percent more bearing surface. It is designed for loads greater than 350 hp and fits all of the Currie 9-Plus cases.
Currie Standard Bearing Pinion Support (PN 033): $95.95
Currie Big Bearing Pinion Support (PN 94031): $106.60
New Life For 8-Inch Fords
The 8-inch Ford axle was born for light-duty operation in the intermediate and compact Fords and Mercs. It consumes less power, weighs less, and delivers reliability with great regularity. Currie has long recognized the 8-inch Ford's purpose for a wide variety of applications. For example, did you know the 8-inch Ford isn't just for Mustangs, Falcons, Fairlanes, and Comets anymore? This tough and dependable rearend is used in three-wheel motorcycles, golf carts and more.
The 8-inch Ford's weakness is the thin pinion pilot support in the gearcase. This is the part that breaks when we throw large amounts of power at the 8-inch Ford. When the pinion pilot gives out, the ring-and-pinion collide in an unpleasant way. So what to do?
There are two 8-inch castings. Prior to 1967, the 8-inch gearcase had horizontal ribs and a thin pinion pilot support area. And like the 9-inch Ford, the oil filler plug was on the axlehousing. Beginning in 1967, the 8-inch gearcase had waffled ribs for added strength. The oil filler plug was moved to the gearcase, as well. This is the gearcase to go with if strength is important to you.
Because Currie Enterprises understands the need for a heavy-duty 8-inch differential, it developed the new Alumin8 gearcase for 8-inch applications. The Alumin8 is precision-made with 206T6 aluminum for extraordinary strength. This makes it ideal for high-power street applications, but it is not designed for racing. The Alumin8 eliminates the 8-inch Ford's basic pinion pilot support weakness. Currie puts more meat around the pinion pilot for added strength. This makes it better and lighter than the stock iron casting.
One important issue to remember about the 8-inch Ford is a lot of what we know about the 9-inch Ford applies to the 8-inch, as well. The 28-spline, small-bearing axle shafts interchange between the 8-inch and 9-inch axles, as long as axlehousing width is the same. the two sizes differ in carrier and ring-gear sizing, but the basic principles are the same.