Thanks guys!
The numbers he gave me are 25" for the drivers side axle tube (flange to casting) and 16" for the passenger side. Are the Fords actually 9" different typically? He said it originally came out of a 3/4 ton Ford van and was swapped into the pickup at some point by his dad. ... If nothing else, It may have a good set of gears and/or a limited slip that is worth keeping.