Explorer shafts are way too short for a Ranger Supercab.
My stock (two piece) driveshaft was near 69" from the center of each ujoint. I know that's not the standard place to measure, but it suite my purpose.
I replaced it with a one piece aluminum shaft from a 2008 ranger Supercab manual trans 2wd coil spring truck, exact length.
I positioned my engine with the driveshaft connected, to avoid the need for any modifications. And yes I have an Explorer shaft here to compare.
On topic, the Fox Mustangs guys often re-drill the pinion flange for the larger bolt patter. wonder if there is enough meat on your flange to drill the new patter, and use a later Ranger/Explorer/Mustang/F150 driveshaft flange for the rear of the driveshaft? When I've seen this done, they did not tap threads into the flange, but use nuts and bolts to hold it together. Just a thought.