The Eaton Fuller countershaft gear, part number 4305657, is a genuine OEM transmission gear for Eaton Fuller manual transmissions. Also cataloged as a counter gear assembly, this part cross-references a broad range of numbers including 4302087, 19240, 19243, 20392, 21020, 35531792, and 85112504, making it a common replacement target across multiple transmission service applications. The part is also referenced as HF4305657, FUL-4305657, and ZBF4305657 depending. If you need help confirming this is the correct gear for your application, call us at Pro Gear and Transmission.
Interchanges:
- Navistar 588842C1
- Navistar 588842C2
- GMC 15535139
- Mack 3088-19240
- Mack 3088-21020
- Mack 3088-4302087
- Mack 3088-4305657
Features
Genuine Eaton Fuller OEM countershaft gear for manual transmissions
Part number 4305657, also referenced as HF4305657, FUL-4305657, and ZBF4305657
Cross-references include 4302087, 19240, 19243, 20392, 21020, 35531792, and 85112504
Sold individually as a single replacement gear unit
Sold by Pro Gear and Transmission
Used in 115 Eaton Fuller models
