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#4. 4L80E Hard Input Shaft. This is a must if you have nitrous. Input Shaft and Clutch Hub Upgrades Recommended if Over 500 Horse Power. This Billet Input Shaft is a 100% Bolt-In replacement for the OEM shaft. Made from 9310 Vacumelt, this shaft is vastly stronger than the OEM shaft and is a must have component for high horsepower Pro-Street and Off-Road applications. Cost $463.00