What is the OEM rear end gear ratio on a 1997 Ford Ranger with 4.0L and 8.8 end?

There's no single answer to the rear-end gear ratio for a 1997 Ford Ranger 4.0L with an 8.8" rear end. The ratio varied depending on the options selected (like transmission type, trim level, and whether it was 2WD or 4WD). To know for sure, you need to:

* Check the sticker on the driver's side doorjamb: This sticker usually lists the axle ratio.

* Look at the casting number on the differential: This number can be decoded to find the gear ratio. You'll need to find a chart or database of Ford differential casting numbers online.

* Physically count the teeth on the ring and pinion gear: This is the most accurate method but requires removing the differential cover.

Without one of these methods, it's impossible to definitively state the gear ratio.