Help Me ID My Ford Nine Inch, wait...

I swear I did the search. I have seen all of the offsite links to tables and charts. My axle is not shown.

First Line of Tag reads: "S319D"

Second line of tag reads: "3L50 9 5A02" (which i know is the ratio)

It has 5 on 5.5 lugs (sweet) and measures 65.75" at the drums.
Thanks in advance for being so awsome!

 

it's a 3.50 track lock out of a 1965, 1975, or 1985 ford truck.

What are the other letters? should be a code like WAB-AB or something on the first line. Unless something happened to the tag...

 

Thats pretty wide maybe Bronco or truck, or van.

Its a posi though!

Is it leaf sprung or coil? Does it have shock brackets on it?

 

'65 was 61.25" wide ('57-'72), so that narrows it to '75 or '85.

 

s319d

came from a 1985 to 1989 ford f-150 or bronco

 

That and the date code 5A02 (Jan 2nd 1985) narrows it down pretty well.