* C6 3-speed automatic: This was a common option, particularly with the larger V8 engines.
* E4OD 4-speed automatic: This was also available, and likely more common in higher trim levels or with some V8 engines. It was Ford's electronically controlled 4-speed automatic.
* Manual Transmissions: Several manual transmissions were also offered, but pinpointing the exact specifications without knowing the engine and trim level is difficult. They were typically 4-speed or 5-speed units.
To know for sure which transmission was in *your* 1988 Ford Bronco, you'll need to check the vehicle's identification number (VIN) or look at the transmission itself (often found stamped on the side). Your owner's manual will also list this information.