What is the gear ration for a 2001 ford f-150 4x4 4.2v6?

There isn't a single gear ratio for a 2001 Ford F-150 4x4 with a 4.2L V6. The gear ratio depends on several factors, primarily the optional rear axle ratio chosen at the factory. Ford offered several different axle ratios for this truck. To find the specific gear ratio for *your* truck, you need to:

* Check the sticker on the driver's side doorjamb: This sticker usually lists the axle ratio (e.g., 3.55, 3.73, 4.10).

* Look at the tag on the differential: The differential itself will usually have a tag indicating the gear ratio. This is the most reliable method.

Without knowing which axle ratio your specific truck has, it's impossible to answer your question.