PACCAR TX-12 vs Eaton Endurant HD
Specs, oil interval and warranty compared
Transmission comparison
The published specs for the PACCAR TX-12 and the Eaton Endurant HD match on almost every line. Both list 12 forward gears, a 1,850 lb-ft rating, a 657 lb weight, 16 pints of oil and the same gear ratios. Both list 750,000 miles for the oil, and both list a 5-year, 750,000-mile transmission warranty for linehaul. Neither company's pages explain why, so this page does not say how the two are related. What differs is who sells it, the oil Eaton names, and the truck listings.
Figures for TX-12 vs Endurant HD are taken from the makers' own published documents. Last reviewed November 3, 2026.
TX-12 vs Endurant HD: side-by-side specs
| Spec | PACCAR TX-12 | Eaton Endurant HD |
|---|---|---|
| Type | Automated manual (AMT) | Automated manual (AMT) |
| Speeds | 12 forward, 2 reverse | 12 forward, 1 or 2 reverse |
| Torque | 1,850 lb-ft torque capacity | 1,850 lb-ft maximum engine torque |
| Weight limit | 110,000 lb maximum operating weight | 110,000 lb maximum GCW |
| Weight | 657 lb (transmission, clutch and oil) | 657 lb with a single PTO (660 lb with dual PTO) |
| Oil capacity | 16 pints | 16 pints (7.57 L) |
| Oil type | Not named in the spec sheet or brochure | Eaton PS-386 |
| Gear ratios | 14.43, 11.05, 8.44, 6.46, 4.95, 3.79, 2.91, 2.23, 1.70, 1.30, 1.00, 0.77. Reverse 16.92, 12.95 | Same ratios. Reverse 16.92, 12.95 |
| Overall ratio | 18.85 | 18.85:1 |
| Oil interval | First oil change at 750,000 miles | Up to 750,000 miles |
| Warranty as printed by the maker | Transmission 5 years or 750,000 miles; clutch 3 years or 350,000 miles | Linehaul and pickup and delivery: transmission 5 years or 750,000 miles; clutch 3 years or 350,000 miles |
| Clutch | 430 mm self-adjusting, greaseless, maintenance free | Maintenance-free diaphragm spring clutch (size not stated) |
| Engines the maker names | Designed to work with PACCAR MX engines and axles | Not stated for the HD |
| Trucks | Peterbilt 579 and Kenworth T680, per our model list | Not listed. Eaton Cummins says approval goes through the truck maker |
Full detail for each transmission: PACCAR TX-12 guide and Eaton Cummins Endurant guide.
What actually decides TX-12 vs Endurant HD?
We do not name a winner in TX-12 vs Endurant HD. There is no independent, like-for-like study of fuel economy or reliability for these transmissions. These are the facts that decide it for a given truck and duty cycle.
- The listings are where they differ
- PACCAR says it designed the TX-12 to work with its MX engines and axles, and our model list shows it in the Peterbilt 579 and Kenworth T680. Eaton Cummins names no truck models for the Endurant HD. If you want one on a given truck, ask that truck's maker, not the transmission maker.
- Do not assume the two are interchangeable
- The published numbers match, but no maker page says one can replace the other, or how the two are related. A part, a warranty or a service program that covers one may not cover the other. Ask the dealer before you swap anything.
- Find the right oil for the TX-12
- Eaton Cummins names its oil, Eaton PS-386. PACCAR's TX-12 spec sheet and brochure give the oil amount, 16 pints, but no oil type. Use the PACCAR service manual or a PACCAR dealer for the approved TX-12 oil.
- Look at the PRO and the direct-drive versions
- PACCAR also sells a TX-12 PRO, which Peterbilt says supports up to 1,700 lb-ft with the MX-13. The Endurant HD also has an 11-speed direct drive version rated 1,750 lb-ft and 80,000 lb. If you compare used trucks, check which version each one has.
Put your TX-12 vs Endurant HD oil changes on a schedule with the maintenance scheduler. Decode warning lights with the fault code lookup. Before you buy a used truck, run the VIN decoder and the used truck inspection checklist.
More transmission comparisons and guides
TX-12 vs Endurant HD frequently asked questions
Is the PACCAR TX-12 the same as the Eaton Endurant HD?+
The published specs match on almost every line: the same ratios, the same 657 lb weight, 16 pints of oil and a 1,850 lb-ft rating. Neither PACCAR's nor Eaton Cummins's pages say how the two are related, so we can't say they are the same transmission. Ask a dealer for the part numbers of the unit in the truck you are looking at.
Which has the longer oil change interval, the TX-12 or the Endurant HD?+
Both list 750,000 miles. PACCAR says its first oil change is at 750,000 miles. Eaton Cummins lists up to 750,000 miles for the Endurant HD. They are the same figure on the two pages.
Do the TX-12 and the Endurant HD use the same oil?+
Eaton Cummins recommends Eaton PS-386 for the Endurant HD. PACCAR's TX-12 spec sheet and brochure do not name an oil type, only the amount, 16 pints. Ask a PACCAR dealer which oil is approved for the TX-12.
What warranty does the TX-12 have compared with the Endurant HD?+
PACCAR lists 5 years or 750,000 miles on the transmission and 3 years or 350,000 miles on the clutch. For linehaul and pickup and delivery, Eaton Cummins lists the same terms for the Endurant HD. For construction, refuse and agriculture it lists 3 years or 300,000 miles and 2 years or 200,000 miles.
Which trucks have the TX-12 and which have the Endurant HD?+
Our model list shows the TX-12 in the Peterbilt 579 and Kenworth T680. Eaton Cummins's Endurant pages list no truck models. They say approval goes through the truck maker and Eaton Cummins, so ask the truck maker.
Sources for TX-12 vs Endurant HD
- PACCAR: 12-speed automated transmission spec sheet
- PACCAR: TX-12 brochure
- Peterbilt: TX-12 PRO available with MX-13 engines (March 24, 2025)
- Eaton Cummins: Endurant HD 12-speed automated transmission
- Eaton Cummins: Endurant XD 18-speed automated transmission
- Eaton Cummins: Endurant XD Pro 18-speed automated transmission
Choosing between TX-12 vs Endurant HD? Let a dispatcher help.
Grow Trucking finds loads, negotiates rates and does the paperwork for owner-operators and small fleets. Tell us what you haul and we will show you how a TX-12 vs Endurant HD truck fits the lanes we book.
Also: About Grow Trucking · Refer a carrier · Trucking blog
Ratings, intervals and warranty terms for TX-12 vs Endurant HD change by model year and configuration. Confirm exact figures for a specific truck against the makers' current documents and your written warranty before you buy or set a service schedule.
Free tools for a TX-12 vs Endurant HD decision
Keep a TX-12 vs Endurant HD truck serviced on time, decode its fault codes and check a truck before you buy.
- Preventive Maintenance SchedulerTrack oil changes for a TX-12 vs Endurant HD truck by odometer and duty cycle.
- Diesel Fault Code Lookup (SPN/FMI)Decode the SPN/FMI fault codes either TX-12 vs Endurant HD transmission reports.
- Breakdown Cost EstimatorEstimate what a breakdown costs in repairs and lost revenue on a TX-12 vs Endurant HD truck.
- Used Truck Inspection ChecklistCheck the transmission and clutch on a TX-12 vs Endurant HD truck before you buy it used.