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The 4L85E’s greater overall length requires moving the transmission mount location back roughly 3 inches. To accomplish this, Gearstar fabricated a custom transmission mount made from rugged 3/8-inch hardened steel that’s been powdercoated black. While this puts extra stress on the factory mount holes, Zack says that they’re more than up to the task since they’re reinforced from the factory. An optional front torque arm mount is available for cars that are still running the stock unit.