The Eaton Fuller Mainshaft Nut, part number GX8870564 or HFGX8870564, is a genuine OEM transmission component designed for Eaton Fuller manual transmissions. The mainshaft nut secures the mainshaft assembly, maintaining proper bearing preload and gear stack alignment within the gearbox. Sourcing a correct, genuine Eaton Fuller nut for this application matters: an improperly spec'd fastener here can compromise mainshaft integrity under load. Pro Gear and Transmission carries genuine Eaton Fuller drivetrain hardware. Call us to confirm this is the right part for your specific transmission build.
Features
Genuine Eaton Fuller OEM mainshaft nut
Part number GX8870564, also referenced as HFGX8870564
Secures mainshaft assembly to maintain proper bearing preload and gear stack alignment
Sold as an individual unit
Sold by Pro Gear and Transmission
