To find the exact towing capacity for a specific Ford F-150 with a 5.4L engine, you need to:
* Identify the model year: Towing capacities changed from year to year.
* Find the vehicle's sticker: The sticker on the driver's side doorjamb or the owner's manual will list the maximum towing capacity for *that specific truck*. This is the most reliable source.
* Check the Ford website: You can use the Ford website's vehicle specification tool and enter the year, trim level, and other details to find the towing capacity.
Without this specific information, any number I provide would be a guess and potentially inaccurate and unsafe.