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an you upload a picture of the leak it will be much easier to help with a picture, use the paperclip icon to upload
never in my 25 years with jeep have i seen a 3.8 minivan motor wear the crank or balancer the 4.0 yes but the 3.8 was used in millions of minivans and wranglers there is a sleeve that must be used to prevent the spring in the seal from rolling out when installing the new seal, if you don't use it the seal will leak
so do you still want assistance?
if the balancer has a sleeve on it I would replace the balancer, and install a NEW OEM seal preferably using the guide tool to prevent damage
looks like that crank is junk, what was the end play on it, while not common it is very possible the crank is moving around killing the seal, by the way the oil pump is inside that front cover and is driven by the crank
not a theory I have seen this that's why a timing cover comes without the seal installed now it is EASY to damage