With the age of your van, the rubber front pump seal gets hardened from age. When you remove the engine, the torque converter hangs down and cracks the seal, then you have a leak. Professionals prop the torque converter up before unbolting it from the flex plate to prevent this problem.
However, ... Based on your description of a "box", it sounds like the leak is in the front by the solenoid pack. That should not have been touched to replace an engine. I think I would look closer at the transmission cooling hoses going to the radiator. One of them might have been ripped causing fluid to leak near the solenoid pack.
Caradiodoc
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Wednesday, November 11th, 2009 AT 1:21 AM