The Eaton Fuller countershaft gear, part number 4305052, is an overdrive countershaft gear (OD GEAR-CNTRSHFT) used in the countershaft assembly of a wide range of Fuller heavy-duty transmissions. This gear supersedes earlier part number 4302089 and is specified at a quantity of two per countershaft assembly. Confirmed fitment spans 19 transmission models, including RTAO, RTO, RTX, and RTXF series units such as the RTAO-15710B-AC, RTX-15710B, RTXF-15710B, and the RTO-14910B, RTO-16910B, and RTO-18910B families. Call us to confirm proper fit for your specific transmission serial number.
Interchanges:
- 3088-4305052
- 35530817
- 4302089
- 4305052-SP
- 59380
- 85104422
- EF59380
Features
Overdrive countershaft gear (OD GEAR-CNTRSHFT) for Eaton Fuller transmissions
Installs in the countershaft assembly; two gears required per assembly
Supersedes Eaton Fuller part number 4302089
Fits 19 confirmed transmission models across RTAO, RTO, RTX, and RTXF series
Genuine Eaton Fuller part sold by Pro Gear and Transmission
