When every pound and thousandth of a second counts, racers need lightweight, yet heavy-duty parts for their vehicles. Strange HD Pro aluminum cases offer large bore sizes for the highest splined axles. They use superior 206-T4 heat-treated aluminum, which has 12 percent more yield strength and 32 percent higher tensile strength than the commonly used 356-T6; it's also substantially lighter than an iron case. They are designed for drag racing or abusive street/strip applications with high horsepower and torque. When you need a lightweight heavy-duty case to run high-splined axles, order a Strange HD Pro aluminum cases. Overview: - Case Style: Ford 9 - Case Material: Aluminium - Case Finish: Natural - Main Caps Included: Yes - Main Cap Material: Aluminium - Main Cap Retention Style: Stud - Carrier Bearing Diameter (in): 3.812 - Pinion Support Bolt Quantity: 5 - Standard Pinion Location: Yes - Hardware Included: Yes - Ring Gear Load Bolt: No - Notes: Requires Strange N2322 or N2323 pinion support.