Loosen the converter and slide it back into the trans. Crank it and see if you hear the noise. If you suspect a cracked flex plate or loose bolts, you can remover all the trans to engine bolts, install 2 long shouldered bolts on either side to slide the trans back enough to get a wrench on the flex plate bolts. I have skinny arms and used to replace cracked flex plates this way. Of course you’ll have to ensure the trans mount is loosened enough to slide. I have seen-heard knocks related to worn crankshaft thrust-bearing. That also tends to cause oil leaks at the rear seal also…. Just thoughts at random.
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