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Grow Trucking truck specs: International T14 transmission

International T14 Transmission

Specs, gear ratios, oil change interval and warranty

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International (Navistar)

The International T14 is a 14-speed automated manual transmission that International designed in-house. International sells it as part of the S13 Integrated Powertrain in the LT, RH, HX and HV series. Full torque is available at 900 rpm, and 13th gear is direct drive. On highway trucks, the transmission warranty is 60 months or 750,000 miles.

International (Navistar) published the International T14 figures in its own documents. Last reviewed November 3, 2026.

What are the International T14 specs?

TypeAutomated manual (AMT), 14-speed overdrive, planetary gears
Direct drive13th gear. International says peak fuel economy is in 13th, and 14th (overdrive) is for light or empty loads.
TorqueFull torque is available at 900 rpm. International's page gives no separate torque rating for the transmission.
ClutchElectronic clutch actuator that shifts without drawing from the air system
CoolingStandard integrated oil cooler
Reverse gears2 on LT and RH; up to 6 optional on HX and HV
PTOSingle and dual transmission PTOs, plus REPTO and FEPTO, with no horsepower limits
WeightNo weight is given. International calls it the most compact 14-speed.

Compare the International T14 with the others in the transmission specs reference, and see which truck it sits in on the truck model specs.

What should you check before you spec or buy a truck with the International T14?

  • Remember that the T14 is sold only with the S13 as the Integrated Powertrain, in the LT, RH, HX and HV series. It does not pair with another engine.
  • Ask a dealer, or read the owner's manual, for the oil type, capacity and interval. International's page does not state them.
  • Confirm the warranty for the series in writing. International lists 60 months or 750,000 miles for the LT and RH transmission, and different terms for the HX and HV.

What are the International T14 gear ratios?

International T14 gear ratios

  1. Gear 120.81
  2. Gear 216.16
  3. Gear 312.57
  4. Gear 49.76
  5. Gear 57.56
  6. Gear 65.87
  7. Gear 74.55
  8. Gear 83.53
  9. Gear 92.77
  10. Gear 102.15
  11. Gear 111.66
  12. Gear 121.29
  13. Gear 131.00
  14. Gear 140.78
  1. Reverse 116.23
  2. Reverse 212.60
  3. Reverse 39.81 (optional, HX and HV)
  4. Reverse 47.61 (optional, HX and HV)
  5. Reverse 55.91 (optional, HX and HV)
  6. Reverse 64.59 (optional, HX and HV)

The LT and RH use the first two reverse ratios. The HX and HV can add four more.

What fluid does the International T14 use, and how often do you change it?

International's T14 page does not list an oil type, an oil capacity or a service interval. It says only that the T14 has an integrated oil cooler and advanced lubrication. Use your owner's manual or an International dealer for these.

Oil typeNot stated on International's page
Oil capacityNot stated on International's page
CoolerIntegrated oil cooler, standard

International's T14 page gives no service interval, so there is no interval table for this transmission.

  • International says the T14 shifts with an electronic clutch actuator that does not use air from the truck's air system.
  • Ask an International dealer or read the owner's manual for the oil change interval that matches your duty.

Put your International T14 service on a schedule with the maintenance scheduler. If a warning light comes on, decode it with the fault code lookup.

What warranty does the International T14 have?

Warranty, as the maker lists it

  • LT and RH transmission: 60 months or 750,000 miles, whichever comes first
  • LT and RH clutch: 36 months or 350,000 miles, whichever comes first
  • HX and HV transmission, clutch and factory-installed transmission PTO: 36 months with unlimited miles and hours for rear axle ratings under 52,000 lb; 24 months with unlimited miles and hours for 52,000 lb or more

Which engines and trucks go with the International T14?

International sells the T14 as part of the S13 Integrated Powertrain, which is a 12.7-liter engine rated up to 515 hp and 1,850 lb-ft. The S13 and T14 are available in the LT, RH, HX and HV series.

Fitted in the International LT Series, International RH Series, International HX Series and International HV Series.

What International (Navistar) claims

  • International says the T14 is the industry's most compact 14-speed and the lightest and shortest in its class. It gives no weight or length.
  • International says the LT with the S13 leads the on-highway aero category in fuel economy by at least 5% in its testing against three competitors. That is a company claim about the whole truck, not the transmission alone.

What is not published about the International T14?

  • The T14's weight
  • Oil type, oil capacity and oil change interval
  • A torque rating for the transmission itself
  • A price. International sells it as part of the truck's spec.

There is no public, independent failure-rate data for any heavy-duty transmission, including the International T14. This page does not rank reliability. It lists what the maker publishes: ratings, ratios, fluid, service intervals and warranty. For a used truck, ask for the service records and check the oil and clutch history.

How does the International T14 compare with other transmissions?

Each transmission guide on this site follows the same format and the same sourcing rule, so you can read the International T14 next to the others. We do not name a winner.

International T14 frequently asked questions

What oil does an International T14 use?+

International's T14 page does not name an oil type or an oil capacity. It says the transmission has an integrated oil cooler and advanced lubrication. Check the owner's manual or ask an International dealer for the approved oil before you buy any.

How much does an International T14 weigh?+

International does not publish a weight for the T14. It calls it the most compact 14-speed and the lightest and shortest in its class, but gives no figure.

What are the International T14 gear ratios?+

First gear is 20.81 and 14th is 0.78. Thirteenth is 1.00, which is direct drive. Reverse is 16.23 and 12.60 on the LT and RH, and the HX and HV can add four more reverse gears.

What is the International T14 warranty?+

On the LT and RH, International lists 60 months or 750,000 miles for the transmission and 36 months or 350,000 miles for the clutch. On the HX and HV, it lists 36 months with unlimited miles for rear axle ratings under 52,000 lb, and 24 months for 52,000 lb or more.

Which gear is direct drive in the International T14?+

Thirteenth gear is direct drive, with a ratio of 1.00. International says peak fuel economy is in 13th, and it uses 14th (overdrive) for lightly loaded or empty trucks.

Does the International T14 have common problems?+

No independent failure study exists for the T14. International lists a 60-month, 750,000-mile transmission warranty on highway trucks and does not publish a service interval. For a used truck, ask for the service records and which series it came from, because the HX and HV have a different warranty.

Sources for the International T14

Run a International T14 truck? Let a dispatcher handle the rest.

Grow Trucking finds loads, negotiates rates and does the paperwork for owner-operators and small fleets. Tell us about your International T14 truck and we will show you how we can help.

Talk to a dispatcher Call (845) 400-9179

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Ratings, intervals and warranty terms for the International T14 change by model year and configuration. Confirm the exact figures for a specific truck against International (Navistar)'s current documents and your written warranty before you make a purchase or maintenance decision.

Free tools for a International T14 truck

Keep the International T14 serviced on time, decode its fault codes and check a truck before you buy.

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