8 3/4 rear axle coding?

If your housing is fairly rust free & you also have a broadcast sheet for the car, you can take it a step further.

These examples refer to the 8 3/4" housing in my 1970 Valiant. 018 stamped on the housing assembly in my case;

018 on rear differential housing.JPG

018 on the broadcast sheet so they new which assembly this car needed;

018 on broadcast sheet.JPG