To find the rear gear ratio of a *specific* Ford F100, you need to:
* Check the vehicle's data plate: This plate usually located on the driver's side doorjamb or on the glovebox. It may list the axle ratio.
* Look at the differential tag: This tag is usually located on the differential housing itself. It will have the gear ratio stamped on it.
* Consult a Ford parts catalog or online database: Using the year, model, and options, you might find this information online through Ford's resources or sites specializing in classic vehicle parts.
* Physically calculate it: This involves measuring the driveshaft rotation and wheel rotation. This is more involved and less precise.
Without knowing the specific year and model of your F100, it's impossible to give you the rear gear ratio.
