I honestly wouldn't know what to look for even if they had let me take a peek. I asked what the problem was and what caused it. I don't fully remember their answers, but essentially he said that when they tore down the differential, it was full of metal. I asked what caused it and they said it was hard to tell, but said that they see rear diff failures more frequently in vehicles with independent rear suspensions. He also mentioned something about the aluminum housing possibly playing some role.
He found a low mileage (35k) differential in a neighboring state that will work with my gearing, and they said they could swap it out for $1600.
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