Where do you jack up a Ford ranger for a rear tire change with a 2.5 ton floor jack?

Where do you jack up a Ford ranger for a rear tire change with a 2.5 ton floor jack? - 1

On the jacking points. Your handbook will show you exactly where they are located.

READ the owner's manual that came with the truck. It will tell you how to SAFELY lift the rear end of the truck to change a flat tire.

No owner's manual? BUY ONE and THEN read it.

I block the front wheels and raise it at the middle axle/diff.

The differential works.
Under the rear shocks works.
Under the pinch weld of the body works but you may need a 4x4 to get the extra lift needed.

There are published jacking points for your vehicle ( normally found in wonders manual) these can often be found with an online search.
essentially we need strong area where the pressure of jack won't cause damage or slip! Not all cars can be lifted on diff! Check where dampers fix too. Often there will be an area there or nearby that has sufficient strength yo take jack. We may. Also be able to spread load but unless we aware of ares to avoid? This sort of activity is best left to experts.
one would have thought end of axle casing may afford sufficient to use but her agin DO check with manual first. As damage can be expensive to correct.