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It's an often-forgotten component when it comes to upgrading, but unless it's sporting a big "N" above the pinion, the factory third member casting is a relatively low-grade gray iron that can crack with big power or the stress of big tires. Drivetrain Warehouse sent us an assembled third member built with a Currie Enterprises 9-Plus nodular-iron centersection. In addition to the better material, the improved housing also has more webbing and thicker surfaces where it counts for performance applications. View Related Article
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