A356-T6 housing with 3.062-inch carrier bearing race diameter. Compatible with both 5-bolt and 10-bolt pinion supports. 12-pounds lighter than our cast ironCompatible with Ford 9-inch third member housing. Forged aluminum through bolt cap design for additional strength. Compatible with both 28- and 31-spline axle options. Billet steel adjuster nuts with heavy duty keepers to maintain ring & pinion settings. Fits commonly available differential carriers, full size spools, lockers and more. Standard gear oil fill location on driver's side of casting. Lightweight Aluminum 9-inch Center Section Reduces Unsprung Weight There's no denying that theCompatible with Ford 9-inch axle is one of the most popular performance axle swaps in the history of automotive performance. Not only are there more 9-inch axles under hot rods and muscle cars thanCompatible with Ford ever produced, but they're found under many a ride that isn't even aCompatible with Ford, such as first generation Camaros, C10 pickup trucks, G-body race cars, and much more. While they are known for their strength, they are also known for their weight. They are among the heaviest car-based axle assemblies known. While that does help make them strong, it also means you're carrying around additional unsprung weight that hurts performance and handling. One of the simplest options to reduce weight on yourCompatible with Ford 9-inch is by swapping to aCompatible with Ford 9-inch center section made from aluminum. Using a 9” aluminum center section provides similar, if not even more strength, than traditional gray iron third members while shaving 10-12 pounds off your ride's unsprung weight. What does that ultimately mean? For your car or truck that means quicker acceleration, better handling, and even improved braking, as your suspension and axle can respond more quickly to changing road conditions, keeping the tires in better contact with the road