What is the Eaton Fuller FR 10-speed?
Eaton’s Fuller FR Series is a 10-speed manual family with direct-drive and overdrive versions. Eaton’s guide lists it separately from the RT-13 and RT-18 families. The full FR or FRO model code is needed to identify a particular unit’s ratio and rating.
What matters in a comparison
Compare an FR 10-speed with the truck’s engine, final drive and operating weight. Driver preference can be part of the choice, but it should be distinguished from an application approval or an economy claim. For a used unit, obtain gearbox and clutch records and have its condition assessed. Similar gear counts do not make differently coded transmissions interchangeable.
Fluids & filters
Fuller FR North American transmission family; the full model code and installed options govern parts selection.
Reference checked:
Identify the unit first
Use these details to match the manufacturer's application record before choosing a fluid or ordering a filter.
- Complete transmission model code
- Transmission serial number
- Installed oil filter/cooler/PTO arrangement
- Service duty and current lubricant specification
Fluid specifications
Transmission lubricant
Eaton-approved PS-386 synthetic transmission lubricant.
For Fuller FR applications covered by the OEM references; verify the approved-product label.
Source 1 ↗Filter numbers & cross-references
A catalogue cross-reference links part numbers. It does not confirm that either part fits every version of this model. Match the original part to the unit first, then check the replacement manufacturer's application and any supersession.
Optional transmission-oil filter
Cross-reference only: first confirm that the installed assembly’s correct OE service filter is 4304827 using the model/serial parts catalogue. This does not establish that every Fuller FR has this filter.
Application not established by this cross-reference. Confirm this original part number in the manufacturer’s parts catalogue for the exact model and serial number before considering an alternate.
Source 1 ↗ Source 2 ↗Manufacturer catalogue cross-references
- Baldwin BT223Check catalogue ↗
Official service and parts reference ↗
What still needs unit-specific confirmation
- Oil-filter provision varies by transmission and cooler/PTO arrangement. No filter is recommended from gear count alone.
Official service and parts references
Source 1 ↗ Source 2 ↗ Source 3 ↗ Source 4 ↗Follow the current manufacturer's manual for the identified unit. This page does not set a drain interval, fill quantity or repair procedure.
Questions to take to the supplier
- Which FR or FRO code is on the identification plate?
- Is the top ratio direct drive or overdrive?
- Do engine torque and application match the approved rating?
Sources & limits
Manufacturer material supports the identification and overview above. Comparison considerations and supplier questions are Truck University’s original editorial interpretation, prepared with AI assistance. They are not an independent performance test or expert inspection.
Model-family reference only. Availability, specifications and service requirements can differ by year, market and configuration. Verify the actual vehicle or component using its identification and current manufacturer documentation. Do not use this page as a parts-fitment, modification, repair or loading instruction.
Published specifications and examples retain their labelled units; the header preferences apply to calculators.
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