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Did you wipe it clean? If not it certainly looks like there was something there keeping it clean before.
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I wiped the dirt off, but it is clearly a machined flat spot with threaded holes. Its not like I lost anything, whatever isnt there, has never been there.
Mind you it's been a few years since I've spun a wrench for a living but, that looks like your front differential, and the machined flat spot with the three holes is where the bench mount goes for servicing the unit.