Interesting thread. I was wondering the same thing, frankly. I noted in Alldata that my 2wd 1999 Ranger XLT was listed as having a rear stabilizer bar, but when I climbed under to look at it I noticed it wasn't there - and not only was it not there, but there was no indication one had ever been installed. The diagram shows a flat mounting plate on the rear end, to which attaches the bushing and front and rear brackets. But on my rear end, there is no flat plate. So, why would Ford provide incorrect information to Alldata? Or is it possible Alldata pulled the wrong diagram? At any rate, how would one go about retrofitting the rear end to accept a sway bar without welding or swapping out the rear end? Or, as other posters have indicated, is it really necessary?
This was brought about by my replacing the left front stabilizer link (which I discovered had a plastic [!] sleeve around the bolt and hollow bushings) and torquing down the right front link. I figured if the ride improved by replacing the front links, it should be even better by replacing the rear links. (Silly me. Gotta have the links first.)
So, is it really necessary? And does anyone have an opinion about the seeming disconnect between Alldata and reality?