What is the PACCAR TX-12?
PACCAR’s TX-12 family includes TX-12 and TX-12 Pro, each with 12 forward and two reverse gears. The manufacturer’s comparison lists different clutch specifications, engine compatibility and application limits. Pro is therefore a configuration distinction, not a promise of a higher rating in every category.
What matters in a comparison
Compare the exact TX-12 version with your engine, gross weight and body-power requirements. Ask which PTO mounting provisions are included and how the vehicle will use them. Where a quote substitutes Pro for the standard model, review the entire specification rather than reading the suffix as a simple upgrade. Use the correct service and application documentation for the installed unit.
Fluids & filters
PACCAR TX-12 and Pro family reference; identify the full installed model before service.
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 PACCAR transmission model, including Pro suffix
- Transmission serial number
- PTO and cooler configuration
- Original service parts list and duty cycle
Fluid specifications
Transmission lubricant
PACCAR Genuine PS-386 or an approved PS-386 rebrand.
PACCAR TX-12 operator-manual applications; verify current approval for the full model.
Source 1 ↗ Source 2 ↗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.
No application-specific filter number is verified here. Use the official identification and parts references below.
What still needs unit-specific confirmation
- A routine transmission-oil filter part number was not verified for this family. Obtain the model/serial-specific PACCAR service parts list; do not substitute a filter from another Eaton/PACCAR family.
Official service and parts references
Source 1 ↗ Source 2 ↗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
- Is it TX-12 or TX-12 Pro?
- Which engine and application are approved?
- What PTO provisions are included in the build?
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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