The T-4 was made from 1980 to 1986 to be used with a D-300 transfer case. This transmission is a fully synchronized 4 speed, completely rebuilt with upgrades to help with longevity and strength such as torque lock sliders. does not include a shift tower. There is a $300 core charge.
| 1st Gear | 4.03 to 1 |
| 2nd Gear | 2.37 to 1 |
| 3rd Gear | 1.50 to 1 |
| 4th Gear | 1.00 to 1 |
| Reverse | 3.76 to 1 |