7.25 auburn limited slip/sure grip diff.

The guy that is selling it mentioned that he bought it in a sales lot of drivetrain parts from a family who was selling it as an estate sale. So very little info was audible on it unfortunately. But the guy does have a bacholers in automotive technology and diesel. So I'm sure he is hopefully fairly confident in what he thinks it is. Either way I'm intrigued by it. I'm going to meet him at the university he works at to pick it up. I'll get pics up of it with measurements to see if we can verify anything. Looking to pick up a 7.25 rearend as a test mule so we don't damage the factory original in the car. Guy a couple hours away has some to pick from.