I'm selling an Auburn Pro Series 31 spline diff. It was in a rear end I built and ended up not using for long on a project I was doing. The diff was installed and run for less than 10 miles. It hasn't been beaten on since it hasn't seen enough miles on it to completely break it in. The internal gears are in perfect shape and have zero wear. It has new Timken bearings pressed on with races and is ready to drop in. These diffs retail for over 400.00 new. I'm asking 330.00 plus shipping. If you're local, no shipping. Here's some pics.
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