Where is rear differential Ford Ranger?

It's between the 2 rear wheels , the bigger section in the middle is where the gears

are...

If you look up "REAR DIFFERENTIAL" in "GOOGLE IMAGES" it will show you what a diff looks like. then from the center rear of your truck bend down to your knees and take peak like stated above its the bigger section centerd between the 2 rear wheels, AKA pumpkin.