Exact family and transmission type
PACCAR TX-18 is an 18-speed automated manual transmission family for higher-demand vocational and heavy-duty applications. It is distinct from TX-12.
Versions and era boundaries
Separate TX-18 and current PRO variants using exact product literature.
Published ratings and architecture
Crawler, reverse, torque, GCW and PTO capabilities depend on the precise TX-18 model and application. Use the data sheet for the exact model; a family maximum does not establish the limit of the installed unit or truck.
Engine and truck relationships
Qualified Kenworth and Peterbilt vocational/heavy-spec builds may offer TX-18 with approved engines.
Tag, model-code and software verification
Verify transmission tag, clutch/actuator records, software, build sheet and application approval.
Integration and later-swap cautions
Check engine torque, driveline, axle ratio, cooling and PTO/body requirements as one system.
Low-speed, grade and duty-cycle questions
Heavy starts, steep grades, off-highway surfaces, low-speed control and reverse work require exact gearing analysis.
Service evidence and road-test scope
Request fluid/service records where applicable, clutch and actuator history for AMTs, control-module fault reports, calibration history and repair invoices. Evaluate engagement, shifts, reverse manoeuvring and warnings in a safe, suitable road test with qualified follow-up for abnormal behaviour.
Reviewed and verification limit
Reviewed September 4, 2026. Torque, gross-combination, PTO and application limits apply only to exact published models and configurations. This page is not a fitment or operating approval.
Verify the individual truck
Build information, component tags, service records, diagnostics and a qualified inspection take priority over general family-level guidance.
Sources & Technical References
Primary manufacturer and government resources for continuing configuration-specific research.
PACCAR — TX-18PACCAR Powertrain