What is the PACCAR TX-18?
PACCAR’s TX-18 range includes standard and Pro configurations. The published comparison lists 18 forward gears, with three reverse ratios on TX-18 and six on TX-18 Pro. PACCAR associates the Pro version with off-highway and heavier vocational requirements.
What matters in a comparison
For a TX-18 comparison, write down the working duty and identify the actual engine pairing. Request the full application approval, including body-power and operating-weight requirements. The extra reverse ratios may be relevant to a particular job, but they do not establish suitability on their own. Keep vehicle, transmission and auxiliary-equipment limits together when reviewing a quotation.
Fluids & filters
PACCAR TX-18 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-18 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 this TX-18 or TX-18 Pro?
- What reverse and PTO needs does the work have?
- Which engine and complete-vehicle limits apply?
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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