Take it to a mechanic that can properly fix it cause you can't.
Don't try and fix it your self. If you don't know what you are doing, probably cheaper to get a used diff from the junk yard
Your truck is hardly worth spending a grand on for a rebuilt differential so buy a used diff or rear axle assembly.
Looking for a Used Ranger in your area?
CarGurus has 4,541 nationwide Ranger listings starting at $1,400.
Search Ford Ranger Questions
Ford Ranger Experts
Related Models For Sale
Used Cars for Sale