I just love being ignored when I take the time to post a reply, so I'll try this one more time.
Previously when I said I don't know of anyone that has installed a-arms on an i-beam frame, I was referring to the 98+ Ranger A-arm suspension. The Crown Vic suspension is too wide for a Ranger, it's usually used on full size trucks as a semi-bolt in swap. I know people to have swapped in clips from other brands such as yota, and a few s-10 swaps IIRC. I know that Mustang II suspension has been installed more than a few times. I also know of one person who built his own custom A-arm set-up, his truck was set-up for road racing and used more than a few professional racing parts.
You seem interested in the later model Ranger suspension, or at least a set-up using factory for parts. The 98+ Ranger suspension could be swapped in, but will take more than just the a-arms. You will need at least the control arms, the spindles, the section of frame and cross member where they mount, and the steering rack. Then you'll have to do a lot of measuring, cutting, and welding to graft that section of the frame into your Ranger's frame. I'm pretty sure the same would hold true for any suspension you wanted to swap into the front. Easiest way to get an A-arm suspension in your truck would be to swap your body onto a 98+ extended cab 2wd frame, everything (except the front suspension) will pretty much bolt on to the new frame.
It's also pretty easy to understand a frame suspension swap. You have your truck and I assume it's paid for. The suspension swap will cost a couple hundred depending on what you can get the parts for or what you want. A frame swap, well you could probably pick up a dead/rolled/totaled Ranger with a perfectly good frame for less than a thousand, and make most of it back by parting out what you don't want. A fresh start on a new truck is going to cost at least a couple thousand for a nice starting point on a 98+ truck, then you have to invest all of the time and money you had in the old truck all over again.
If you are or know a really good welder have you considered pie cutting and modding your drop beams to correct the camber? I think a few people have done this in the past, if not here over on RPS. Can't recall the results they had from it, not something I see discussed too often in the static dropped forums where I usually hang out over there.
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