spyder7724

sidmanic hit it right on. Ford had some issues with NVH in this platform and went through a bunch of stuff to get rid of it:
the two piece shaft which also uses a CV joint at the pinion instead of a regular ujoint, they filled the panhard bar with sand, oversized bushings on all the control arms, large hydro mounts for the engine and a spongy rubber one for the trans, they also used a back cut ring gear and some cars(like mine)even had bolt-on axle tube weights.
you mentioned the rangerp/u and some modelshavea similar style shaft depending on the wheelbase. the ranger and the s197 along with explorers all used the same 31 spline posi unit and the same 5r55s auto trans(and manuals with a fixed flange output shaft)which seems to have caused problems no matter what vehicle ford has used them in.

bkid

I have very little NVH with my Powerhouse driveshaft.There have been absolutely not one issue.

sidmanic

That's pretty much what the engineers said if you switched to a one piece. They had to build the car to a certain spec which is why we get what we get stock.