The Eaton Fuller Mainshaft Key Assembly, part number A-3990 or A3990, is a manual transmission main shaft key with pin designed for Eaton Fuller gearboxes. This key measures 7.5 inches in length, 0.1875 inches wide, and 0.125 inches in height. The key is sold individually (each). Pro Gear and Transmission carries this part for fleet shops and drivetrain specialists who need an exact OEM fit. Call us to confirm the correct application for your specific transmission model.
Interchanges:
- 26760
- 35530494
- 674652
- A3990-SP
- EF26760
- HFA-3990
- S-5027
- Navistar 398054C1
- Navistar 398054C11
- Fuller 16225
Features
Eaton Fuller OEM mainshaft key with pin for manual transmissions
Part number A-3990 or A3990
Dimensions: 7.5 in. length x 0.1875 in. width x 0.125 in. height
Sold individually as a single replacement key
Fits Eaton Fuller manual transmission applications requiring mainshaft key service
Tech Specs
- Part Number: A-3990 or A3990
- Part Type: Mainshaft Key with Pin
- Length: 7.5 in.
- Width: 0.1875 in.
- Height: 0.125 in.
- Unit of Measure: Each
Used in these Eaton Fuller models
