* Three-speed automatic (C6): This was a popular choice, particularly with V8 engines.
* Four-speed automatic (4R70W): This was also available, especially on higher-trim levels or with certain engine options.
* Five-speed manual: A manual transmission was available, typically with the I6 engine.
To know for certain which transmission was in *a specific* 1988 Ford F-150, you'd need to check the vehicle's documentation (owner's manual, build sheet) or look at the transmission itself (the identification tag is usually on the transmission case).
