* A compatible automatic transmission: This requires finding a transmission that fits the truck's engine and chassis. The year and model of the truck will heavily influence the choices available. You'll need to research which automatic transmissions were offered in similar Ford trucks from that era.
* A new torque converter: This is the crucial part that connects the engine to the automatic transmission.
* A transmission crossmember: The crossmember that holds the manual transmission will need to be replaced with one designed for an automatic.
* Driveshaft modifications: The driveshaft may need to be shortened or lengthened to accommodate the automatic transmission.
* Wiring harness changes: The wiring harness may need modification to accommodate the automatic transmission's controls and electrical components. You might need a new harness or significant rewiring.
* Shift linkage and controls: The manual shift linkage will need to be removed and the necessary parts for the automatic transmission (such as the shifter and its cable/linkage) installed.
* Computer control (potentially): Depending on the year and engine, your truck may have a carburetor or an electronic fuel injection system. The latter often interacts more extensively with the automatic transmission's computer.
* Hydraulic lines: New hydraulic lines for the transmission will be needed.
This is a complex job requiring mechanical expertise, specialized tools, and likely significant time investment. It's often more cost-effective to simply find a 1979 Ford truck that already has an automatic transmission if you want that feature. The cost of parts and labor to perform the conversion could easily exceed the value of the truck itself.
