Borg-Warner T4 & T5

The Borg-Warner T4 and T5 transmissions can be found behind the AMC 2.5L I4 and the AMC 258 I6 in 1982 to 1986 Jeep CJs. The T4 and T5 are 4-speed and 5-speed standard shift transmissions, and are considered light duty.

The Borg-Warner T4 and T5 transmissions were nearly identical besides the T4 missing the overdrive gear. It has a 23 spline output shaft and a 1.125″ x 10 input splines for AMC I6 engines and 1.000″ x 14 input splines for the AMC 2.5L I4. All T4 and T5 transmissions have a input shaft stick-out length of 7.5″.

The T4 and T5 transmissions are generally considered to be weak transmissions and are not often used as an “upgrade” swap for Jeeps.

Jeep recommends you replace the transmission fluid in the T4 and T5 every 27,500 miles. AMC/Jeep Automatic Transmission Fluid or an equivalent labeled Dexron II is the factory recommended transmission fluid. Others have had success with Synchromesh manual transmission fluid.

Gear Ratios

GearT4T5
Reverse3.763.76
1st4.034.03
2nd2.372.37
3rd1.501.50
4th1.001.00
5thN/A0.86

Fluid Type and Capacity

LubricantAFT Dexron II
Capacity1.75qts (1.65L)
Avoid GL-5 and “Severe” lubricant, which can cause increased wear on the brass synchros found in this transmission

Other Specifications

WeightT4: 60lbs
T5: 70lbs
Length15.25″
Input SplinesAMC I6: 10
AMC I4: 14
Output Splines23
Pilot Tip Diameter0.59″

Transfer Case Compatibility

The T4 and T5 transmissions were mounted to the Jeep Dana Spicer Model 300 transfer case.

Engine/Bellhousing Compatibility

AMC – The T4 and T5 transmissions were used with the AMC I6 and AMC I4 engines and are factory compatible with them.

GM – The T4 and T5 transmission can be mated to GM V8 engines use this adapter from Advance Adapters.

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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