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
| Gear | T4 | T5 |
|---|---|---|
| Reverse | 3.76 | 3.76 |
| 1st | 4.03 | 4.03 |
| 2nd | 2.37 | 2.37 |
| 3rd | 1.50 | 1.50 |
| 4th | 1.00 | 1.00 |
| 5th | N/A | 0.86 |
Fluid Type and Capacity
| Lubricant | AFT Dexron II |
| Capacity | 1.75qts (1.65L) |
Other Specifications
| Weight | T4: 60lbs T5: 70lbs |
| Length | 15.25″ |
| Input Splines | AMC I6: 10 AMC I4: 14 |
| Output Splines | 23 |
| Pilot Tip Diameter | 0.59″ |
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
