Ford Ranger Axles - The Ranger Station
I think most of the 4-cylinders got the 4.10:1 ratio, 3.73:1, or 3.55:1 ratio rear gears, but it's always best to check.
You can usually determine it by using the conversion formula for engine speed vs vehicle speed in your 1:1 gear.
RPM = ((MPH * (rear ratio * 336)) / (tire diameter in inches)