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.
Fluid Type and Capacity
|Lubricant||SAE 80W GL4|
SAE 80W-90 GL4
|Capacity||~1.65 qts (1.56L)|
Fill to hole
|Pilot Tip Diameter||3/4″|
Transfer Case Compatibility
The T15 transmission came exclusively mated to the Jeep Dana Spicer Model 20 transfer case.
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