Both housings are made from high-grade nodular iron instead of the standard, weaker gray iron. The new castings are specifically made for this application and accept all the 9-inch carriers and internals. The Ford 8.8 ring gear has the same bolt pattern as the 9-inch and is virtually as strong. The 8.8 pinion gear doesn't have a pinion support on the end, like a 9-inch, which is why a new casting was needed. The carrier also features chrome-moly bearing caps, bolts, and adjusters, with the same axle spacing as the 9-inch.