It didn't come apart under a load so should be no worries there. In fact, after pulling the center section out, it was much less damaged than it sounded like.
Pinion nut came loose and the massive noise was the pinion gear grinding on the casing of the suregrip unit. Luckily, I didn't drive it much or make it worse.
Got new gear and bearings & stuff from Dr. Diff and am ready to hopefully get that all back together.
Decided to go with 3.73 gears to make it more street-friendly. Eager to see how it feels!