I found when I would get them in with a loud whine when reving the eng it was usually the filter clogged and/or the cooler clogged. But what clogs them is the problem as I have seen converter clutch material do it many times. If it wont move at all I would check to see if the pump has any pressure at all as it may be caused by the converter. I have driven some with clogged filters that would just stop moving while driving and then when they sit about 20 minutes turned off it will start up and drive a bit again. Ron