The Eaton Fuller Mainshaft Gear, part number 18518, is a genuine Eaton Fuller transmission component for heavy-duty truck applications. Mainshaft gears are critical internal transmission parts that carry torque through the gear train, and using the correct OEM-sourced part helps maintain proper mesh, bearing load distribution, and shift feel in Eaton Fuller transmissions. If you need to verify that part number 18518 is the correct mainshaft gear for your specific transmission model or build date, contact Pro Gear and Transmission directly and we can help confirm the right fit before you order.
Interchanges:
- 900020
Features
Genuine Eaton Fuller part, number 18518
Mainshaft gear for heavy-duty Eaton Fuller transmissions
Direct OEM replacement for proper gear mesh and torque transfer
Sold by Pro Gear and Transmission
Call to confirm fitment for your specific transmission model
Used in these Eaton Fuller models
