The Eaton Fuller Mainshaft, part number 4303688, is a genuine OEM manual transmission component designed for Eaton Fuller heavy-duty transmissions. The mainshaft is a core internal drivetrain component, transferring torque through the gear stack in the transmission case. This shaft is sold as an individual unit. Pro Gear and Transmission carries genuine Eaton Fuller internal components for professional fleet and shop buyers. Not sure this is the right shaft for your transmission? Give us a call to confirm proper fit before ordering.Interchanges:HF4303688FeaturesGenuine Eaton Fuller OEM mainshaftPart number 4303688Manual transmission internal componentSold as an individual unitSourced and sold by Pro Gear and Transmission