The Eaton Fuller Countershaft Auxiliary Assembly, part number A-5603 or A5603, is a direct Eaton Fuller transmission component for heavy-duty truck auxiliary section service. The countershaft assembly is a core internal part of the Fuller auxiliary section, carrying gear sets that support range or speed selection depending on the transmission configuration. Because auxiliary section design varies across Fuller transmission models, call Pro Gear and Transmission before ordering to confirm this assembly is correct for your specific gearbox and application.
Features
Genuine Eaton Fuller countershaft auxiliary assembly
Part number A-5603 or A5603
Designed for Eaton Fuller heavy-duty transmission auxiliary sections
Sold by Pro Gear and Transmission
Call to verify fitment for your specific Fuller transmission model
