What is the Eaton Fuller RT-13?
RT-13 is Eaton’s 13-speed manual transmission family. Eaton publishes specific service information for 13- and 18-speed designs, and the RT-13 should not be confused with an automated manual merely because both appear in heavy-truck listings. Full model identification is still required.
What matters in a comparison
On an RT-13-equipped truck, compare engine rating and final-drive gearing with the work. Ask for the actual model code and records of clutch, gearbox and driveline work. A 13-speed label is not a basis for selecting a replacement transmission or modifying controls. Use the matching manufacturer documentation and qualified service advice for compatibility and condition decisions.
Fluids & filters
Fuller RT 13-speed 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 RT 13-speed 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 RT 13-speed 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 full RT-13 model is fitted?
- What clutch and gearbox work is documented?
- Does the vehicle specification match the transmission 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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