LD4B part number question

I'm curious on this too. I found this one on CL Mopar and it is the 283613 casting number.
That is a good deal. The last one I sold in that condition brought $284

I'm going by there today to buy some wheels and look at a 8 3/4 rear end for my truck. Alan seems like a decent Mopar guy who is selling off parts to fund a couple of projects.