Borg-Warner T86

The Borg-Warner T86 transmission was a three-speed transmission installed in the Jeep CJ in 1966. It was mounted behind the Buick “Dauntless” V6 engine. It was replaced by the T14 transmission by mid 1967.

Only the second and third gears are synchromesh.

The T86 transmission has a 1.125″ x 10 spline input shaft. Length of the input shaft varies with application. The output shaft was 1.375″ x 6 spline. The original mounting to the Buick engine used a 2.5″ thick cast iron adapter plate. The adapter plate can also be used with a Chevy V8 bellhousing without any modifications.

The transmission was used behind the Dauntless V6 engine in the CJ-5, CJ-6, CJ-5A, and CJ-6A. The model number is AS7 T86AA. For the DJ-5 and DJ-6, the transmission the AS9 T86AA.

The factory service manual called for changing the transmission fluid every 12,000 miles with SAE 90W or 80W GL4 fluid. It is OK to use 80W-90 fluid, just be sure to not use any fluid labeled “Severe” and ensure the fluid is safe for brass synchros. Avoid GL5 gear oil.

Due to it’s low usage and weakness, this transmission is often not used for swapping.

Gear Ratios

Reverse3.79
1st Gear2.79
2nd Gear1.68
3rd Gear1.00

Fluid Type and Capacity

LubricantSAE 90W GL4
SAE 80W GL4
Capacity1.25 qts (1.18L)
Avoid GL-5 lubricant, which can cause increased wear on the brass synchros found in this transmission

Other Specifications

Weight75lbs
Length9″
Height14″
Input Splines10
Output Splines6
Pilot Tip Diameterunknown

Transfer Case Compatibility

The T86 came factory with the Jeep Dana Spicer Model 18 transfer case attached (large bore versions only)

Engine/Bellhousing Compatibility

GM – The T86 was factory mounted to the Buick “Dauntless” V6. The adapter plate for this transmission can also be mounted to the Chevy V8 bellhousing.

AMC – This transmission was never used on AMC engines.

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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