The Eaton Fuller Mainshaft, part number 237736, is a genuine Eaton manual transmission component designed for heavy-duty drivetrain applications. The mainshaft is a core internal transmission part, transferring torque through the gear train and supporting the sliding gear cluster. This part is also referenced as HF237736. Sold by Pro Gear and Transmission, this is an OEM-spec Eaton Fuller component. Not sure this is your part? Give us a call to confirm proper fit for your specific transmission.FeaturesGenuine Eaton Fuller OEM mainshaftPart number 237736, also referenced as HF237736Designed for heavy-duty manual transmission applicationsSold by Pro Gear and Transmission