i picked up a rear off a guy i know.he said it has auburn 31 spline axels,auburn posi unit,c-clip eliminators,and 4:10 gears.i took a few pics under the cover just to inspect,and i was wondering if the auburn posi looks like this.ther are also some marks on it(grinding),i was wondering what they were from.

and also what would be a good price for the rear?i paid $500.00