* C4 (Cruise-O-Matic): A very common automatic transmission for many Ford applications.
* FMX (Ford-Matic): Another popular automatic, often found in larger or heavier vehicles.
* Toploader 4-speed manual: A strong manual transmission.
* 3-speed manual: Various 3-speed manual transmissions were also used, but identifying the specific one would require more information about the vehicle.
To determine which transmission was *actually* used in a specific Ford 390 vehicle, you'd need to know the year, model, and possibly the vehicle identification number (VIN).