What year 8.25 diff / need help ID

That 905 number was first cast in at the foundry around 1969 or 1970. The casting was cleaned and the carrier cap mating surfaces were machined flat and the bolt holes were drilled and tapped. The rest of the machining was completed. Then the caps were machined flat and the holes were drilled. Caps were installed and torqued. Then the carrier bearing surfaces were bored to whatever diameter they chose.. ......... Or a similar machining process.