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Yeah, gotta love GM. Hit and miss sometimes on things. I do think all true 4x4 trans cases have the thicker cover flange and the 3 threaded bolt bosses on each side. This is to help keep the case from cracking (when using the correct cast cover) from the extra leverage of the transfer case.

I think that is a 2WD trans case that was rebuilt into a 4x4 unit. That flange where those bolts should go through on the trans, is way too thin compared to a 4x4 trans case. Not sure if you can see it but on the upper right side of the case should be case in a HD letters. Here is a pic I...