The Eaton Fuller Input Shaft, part number 18387, is a genuine Eaton manual transmission component classified under manual transmission gears and components. The input shaft is the primary power-entry shaft connecting the clutch to the transmission’s internal gear train, making correct part identification critical before installation. This part is also referenced as HF18387. Pro Gear and Transmission carries genuine Eaton Fuller drivetrain parts for heavy-duty truck applications. Call us to confirm this shaft is the correct fit for your transmission before ordering.FeaturesGenuine Eaton Fuller manual transmission input shaftPart number 18387, also referenced as HF18387Classified as a manual transmission gear and componentSold individually as a single unitCall Pro Gear and Transmission to confirm application fit