The Eaton Fuller countershaft square key, part number 4304840, is a transmission driveline component used to locate and lock gears or related parts on the countershaft of an Eaton Fuller transmission. The square key seats in a matching keyway to transmit rotational load and keep mating parts indexed during operation. Because keys are application-specific to the transmission model and countershaft configuration, verify this part number against your unit before ordering. Not sure this is your part? Give us a call to confirm the correct fit for your transmission.
Interchanges:
- Fuller 19673
- Fuller 16638
- Fuller 20194
- GMC 2099882
- Mack 3088-16638
- Mack 3088-20194
- Mack 308819673
- Navistar 407757C1
- Navistar 591891C1
- Mack 3088-4304840
Also included in these kits and assemblies
Features
Eaton Fuller part number 4304840
Countershaft square key for Eaton Fuller transmissions
Locates and locks gears or components on the countershaft
Square key profile seats in a matching keyway
Sold by Pro Gear and Transmission
Used in 307 Eaton Fuller models
