The key item mentioned is once in a while you would get a squeal. Engine off it stops and the next restart it may be quiet. But, “It occurs when I try and take the car out of park and into any gear.” This mostly rules out the following scenario since it does not make a noise when the car is first started. I had a rear seal cover screw come out while driving at 70MPH. After being tossed around in the bell housing by the torque converter for about 10 seconds it shot out of the inspection plate like a bullet . There was some minor rattling for a short period but not a squeal.
There are small gaps between the engine and the bell housing and seen a few posts of small stones getting into the bell housing and rattling around. Something else may have gotten in there. In your case, if you think this is the problem you can remove the inspection plate and take a good look, ENGINE OFF. Maybe something will drop out. You can also start the car with the cover off, but stay clear in case something flies out. There is a plastic drain, maybe two, in the bottom of the inspection plate that may have been pushed in. At least use a hose as a stethoscope placed on the top of the bell housing in the engine compartment to see if it is the source.
Tom
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