Borg-Warner T15

The Borg-Warner T15 transmission was a medium-duty 3-speed transmission. It was introduced in 1971 for Jeeps and was offered in Jeep CJs up through 1975 and Full-Sized Jeeps through 1979. It was found behind the AMC V8, AMC 232 I6, and AMC 258 I6 engines. The T15 transmission was an upgrade to the T14 transmission.

This transmission has three forward gears and one reverse. All forward gears are synchronized.

For information removing, rebuilding, diagnosing, or adjusting this transmission please refer to the factory service manual guide below.

When used in the Jeep CJ from 1971 to 1975, the T15 had a 1.125″ x 10 spline input shaft with a 8.5″ stick-out length. When mounted in Jeep FSJs from 1971-1979, it has a 1.125″ x 10 spline input shaft with a ~11″ stick-out length.

On CJ models, the factory recommended fluid change interval is every 15,000 miles. On truck models such as the Jeepster Commando, the fluid change interval is every 30,000 miles.

Gear Ratios

Reverse3.00
1st Gear3.00
2nd Gear1.83
3rd Gear1.00

Fluid Type and Capacity

LubricantSAE 80W GL4
SAE 80W-90 GL4
Capacity~1.65 qts (1.56L)
Fill to hole
Avoid GL-5 lubricant, which can cause increased wear on the brass synchros found in this transmission

Other Specifications

Weight100lbs
Length10″
Input Splines10
Output Splines6
Pilot Tip Diameter3/4″

Transfer Case Compatibility

The T15 transmission came exclusively mated to the Jeep Dana Spicer Model 20 transfer case.

Engine/Bellhousing Compatibility

The T15 fits natively with the AMC V8s, AMC 232 I6, and AMC 258 I6.

The T15 found in 1971-1975 CJs with the 8.5″ input shaft stick-out length is able to be adapted to GM engines using Novak’s adapter assembly.

Write-ups and Tutorials

To Be Completed

Parts and Fluids

Engine Fluids

EngineFluid TypeCapacity
AMC 2.5L I4Above 0°F: 10W-30
Below 60°F: 5W-30
4.0 qts
AMC 4.0L I6Above 0°F: 10W-30
Below 32°F: 5W-30
6.0 qts
GM 2.5L I4Above 0°F: 10W-30
Below 0°F: 5W-30
3.0 qts
Renault 2.1Ltbdtbd
VM Motori 2.5Ltbdtbd

Transmission Fluids

TransmissionFluid TypeCapacity
Chrysler A904 3-Speed
Aisin-Warner AW-4 4-Speed
Chrysler 30RH 3-Speed
Borg-Warner T-4 4-Speed ATF Dexron II1.75qts
Aisin-Warner AX4 4-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.7qts
4WD: 3.5qts
Borg-Warner T-5 5-SpeedATF Dexron II1.75qts
Aisin-Warner AX5 5-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.7qts
4WD: 3.5qts
Peugeot BA-10/5 5-Speed
Aisin-Warner AX15 5-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.32qts
4WD: 3.27qts
New Venture Gear NV3550 5-SpeedMopar MT Fluid
SAE 30W Oil
3.3qts

Axle Fluids

AxleFluid TypeCapacity
Dana 3075W-90
75W-140 (towing)
1.26qts
Dana 3575W-90
75W-140 (towing)
1.75qts
Dana 4475W-90
75W-140 (towing)
2.00qts
Chrysler 8.2575W-90
75W-140 (towing)
2.11qts

Transfer Case Fluids

Transfer CaseFluid TypeCapacity
NP207
NP228/229
NP231
NP242

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4.0L

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