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It looks like it is in a coal mine! I had to use some photo enhancement to read it!
It looks like a Ford 9 inch.
Built in the year 1 (either 1971 or 1981).
Most likely an open rear end since it has a WD prefix (the Limited Slip types had a WF prefix that I know of).
The axle ratio is "x.00" there is no digit stamped in front of the decimal point! But the only Ford 9 inch ratio that I know of that would end in ".00" is a 3.00
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.