Thanks for the advice and checking out my page, Matt. The PTO clutch is already removed, the previous owner just handed it to me, haha. But it is very interesting you said it might be the driveshaft coupler. The drive shaft has a brand new bolt going through it, so it has obviously had something done to it recently. I will test out the muffler soon and if I still get the knock, I'll try the driveshaft.
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