I've been a Ford owner since the late 70's, and I've owned many Fairlanes, Torinos, Rancheros, and more. And I have never seen a Ford Axle code hidden within the VIN code. But if you want to e-mail me the VIN code to my e-mail address, (
red88mustanglx@yahoo.com ) I'll see if I can decipher it for you. But what happened to the codes on the door tag, or the rear end tag? if you have either of those, it's easy to figure out the code for your axle ratio.
Let me know if I can be of any help. I have list after list of every axle code Ford ever used in the 70's and some from late 60's. (Now I all I have to do is find my list book).
Shawn