T18 Transmission

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  • Ford T18 Transmission. We offer a variety of Ford T18 Transmission for your automotive needs. No matter what you're driving, we have the right Ford T18 Transmission for your vehicle. New and Used Automotive Parts and Accessories On Sale. Car and Truck Repair Parts Menu.
  • The T-18 is a heavy duty four speed with unsynchronized first gear. These transmissions were manufactured by Borg Warner and they have a cast iron case. The casting number on the drivers side of the T-18 is T-18 or 13-01. The T-18 has a 1 1/8' 10 spline input shaft and a 1 3/8' 6 spline output.
  • The transmission was used by numerous automobile manufacturers including Ford, International Harvester, and Jeep.Although the T98 was Jeeps first granny low transmission, it was the Jeep T18 that reached the American masses.The T18 introduced the idyllic attributes that jeep would be synonymous with: strength, low gearing, and dependability.
  • T18/T19 4 Speed Manual Transmission: Replaces 4.25' tail housing: 1980-1987 3/4 and 1 ton Ford pickups. 3D0435A: NP 435 4 Speed Manual Transmission: Replaces 4.75' tail housing: 1967-1979 3/4 and 1 ton Ford pickups. 3D0050: ZF 5 Speed Manual transmission with driveline park brake.

The T-18A version used from 1977-1979 is the best transmission ever put in a CJ by the factory since it features a granny low first gear(6:32:1.) Earlier T-18s have the same great strength, but a 4.03:1 first. The T-98 is the predecessor to the T-18 that was an option for CJs from 1955-1970.

TransmissionMain >> Transmission >> Factory >> T-18

From JeepTech and JeepTech Publishing LLC, the Jeep knowledge base.

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The T-18 is a heavy duty four speed with unsynchronized first gear. These transmissions were manufactured by Borg Warner and they have a cast iron case. The casting number on the drivers side of the T-18 is T-18 or 13-01. The T-18 has a 1 1/8' 10 spline input shaft and a 1 3/8' 6 spline output.

The T-98 has a very similar appearance to the T-18 except a casting number of T98. It is heavy duty like the T-18, but a bit more prone to wear since bearings and lubrication are not as good. Internals from a T-18 can be put in a T-98 case. The side picture above is actually a T-98 with granny T-18 guts. The T-98 has a 1 1/16' 10 spline input shaft and 1 3/8' 6 spline output.

T-18s used after 1978 have reverse down by fourth and earlier T-18s have reverse up by third. The shape of the case is also different with the '79+ cases for the different reverse configuration. On the right is a T-18 out of a '79 CJ-5. The blue T-18 in the picture above is out of a '78 CJ-5. Notice the later T-18 has a flat side rather than the bulging side of the earlier T-18. Both versions have a PTO port on the drivers side.

The T-18s used in full size Jeeps(FSJs) such as the Chorokee, Wagoneer, and J-series pickups use a transmission to bell housing adapter. Three basic variations exist with different adapters.

  • Early 70s T-18s use a 1' cast iron adapter with a deep AMC bell housing. The bell housing is the same as the bell housing used with the T-15.
  • Later 70s FSJs with V8 engines use a 5' aluminum adapter and a AMC T-15 bell housing. There are pictures of this version below.
  • Later 70s FSJs with I6 engines use a shoter aluminum adapter and a AMC T-15 bell housing.

The different adapter means a different length input shaft is used. The input shaft size and spline count is consistent for all the Jeep T-18s, but the pilot bushing size varies. The different adapters used with the later V8 and I6 engine where presumably used to keep the drive shaft lengths consistent regardless of engine.

All Jeep T-18s come with a 1' adapter for the Dana 20 transfer case except the T-18 used in 1980 and 1981 J-20 pickups. These trucks used the NP208 transfer case and the adapter for the NP208 is around 9' long and it uses a round bolt pattern. The output shaft of this version of the T-18 is 23 spline. The Dana 20 version of the T-18 has the big hole 'Texas' bolt pattern and 6 spline output shaft.

T18 Transmission Id

Usage

The T-18 was optional on CJs from 1971-1979. The T-18A version used from 1977-1979 is the best transmission ever put in a CJ by the factory since it features a granny low first gear(6:32:1.) Earlier T-18s have the same great strength, but a 4.03:1 first. The T-98 is the predecessor to the T-18 that was an option for CJs from 1955-1970.

T18 Transmission

Other Jeep trucks also had the T-98 as an option from 1955-1970, the close ratio T-18 optional from 1971-1975, and the wide ratio T-18 from 1976-1979. After 1979, the wide ratio T-18 was only avilable as an option in the J-20 pickup truck from 1980-1981. This version of the T-18 has the round New Process bolt pattern and 23 spline output, but the adapter is long for a short wheel base Jeep. Earlier T-18s and T-98s used the 'Texas' bolt pattern and 6 spline output. The truck version of the T-18 uses a long input shaft compared to the T-98 or CJ T-18s.

Transmission 1st 2nd 3rd 4th 5th Rev
T-98 6.40 3.09 1.69 1.00N/A
T-18 4.02 2.41 1.41 1.004.73
T-18A 6.32 3.09 1.69 1.00 7.44

T18 Transmission For Sale

Photos

The Ford version of the T-18 was used approximately from 1967 until 1984. It is a heavy duty four speed manual transmission that is available in wide and close ratio. The transmission weighs close to 150 pounds.

The case and the top of the transmission are cast iron. The Ford version uses the standard Ford 'butterfly' bolt pattern and a 1 1/16' 10 spline input shaft. The input shaft is around 6 1/2' long. The input shaft is about 1/2' shorter than the Jeep T-18 input shaft. The closely related Ford T-98 typically uses a fatter input shaft. The drivers side of the case will be cast with T-18 or 13-01. If you click on the top thumbnail, you can see the 13-01 casting number in that picture.

T18 Transmission Shifter

T18 transmission parts breakdown

There will normally be a PTO cover plate found on the passenger and/or drivers side. There are two shift patterns used, one where reverse is out and up and the other where reverse is out and back. The out and back is the later version.

T18 Borg Warner Transmission

There are generally two styles of output for the 2WD version of the Ford T-18, the long slip yoke style shown in the top picture and a short regular yoke style. The 4WD versions of the Ford T-18 tend to use long adapters and 31 spline outputs.

T18 Transmission

Transmission 1st 2nd 3rd 4th 5th Rev
T-18 6.32 3.09 1.69 1.00 7.44