There was the same problem on rctech which truned out to be the circlip poping out when he tightned it and diff not working then when he took it apart the circlip poped back in in the process of dismanteling it.
I still think that people should check the thrust washers as there is different diameters, the larger one (difference is only about .3mm) should go against the thrust washer to get maximal contact when screwed against it.
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