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The T-18s was used in International Harvester trucks from the mid 60s until the mids 70s. They all tend to have long input shafts compared to the Jeep and Ford T-18s. All of the T-18s used in the Scout 800 and Scout II are close ratio T-18s with a first gear around 4:1. It is an excellent transmission, but it doesn't have the low first off-roaders want. Other IH trucks do use wide ratio T-18s.
An advantage of the IH 4WD T-18s is most of them were mated with the Dana 20 transfer case. The Dana 20 used in Scout trucks uses the same bolt pattern and input gear as most of the Dana 20s used in Jeep trucks. The transmission to transfer case adapter for the Dana 20 used in IH trucks is short like the adapter used in Jeep trucks. Rebuilding one of these transmissions with a Ford or Jeep input shaft may be a way of getting a low buck T-18 in your Jeep.
Like the versions of the T-18 used in other makes of trucks, IH T-18s have a casting number of 13-01 or T-18 on the drivers side. All IH T-18s have reverse out and up.
| Transmission | 1st | 2nd | 3rd | 4th | 5th | Rev |
|---|---|---|---|---|---|---|
| T-18 | 6.32 | NA | NA | 1.00 | NA |