Terrible Noise underneath, found this bolt?!?

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RRWW_Ben

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So 2004 Z71 Tahoe. Truck has been running pretty good for a while other than A/C problem (not related.) anyways put in drive this morning, grinder into gear (never happened before) pull it out of driveway, and it immediately starts make horrible noise sounding like from transmission drive shaft area, didn't drive it 50 yards, put in reverse and right back into driveway.

As I am scrambling to swap vehicles, I found below pictured bolt in driveway?!?!?

86e28e3dcbd8a87efe57157e1853b260.jpg


b962880b3fab131dbad12aa4a1835bd8.jpg



I got underneath it and I found a few with the same marking on the heads, but they were silver & not black like this one...

So any idea where this one could go? Why it would just "fall out." And is it likely that this is what caused the aweful noises? Thanks in advance!


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