I bought another differential to replace the one I thought was broken, when I went to remove it I saw the 4 nuts that mount the diff cover to the subframe were barely on the threads. Pulled the diff and popped the cover, looked better than the one I bought. Reinstalled it with those 4 nuts torqued down, doesn't make the grinding noise anymore. It still makes the faint knocking noise, I'm guessing it's a bad axle. I know that switching to a one piece driveshaft causes some vibrations/clunking, and I'm fine with that, but the noise that it was making was much worse than that.
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