Unfortunately knowing the auto trans behind the 3.7lt V6 Petrol, which is a wishy washy rubbish box, the final road will likely be to replace the transmission.
To check levels correctly, search the KJ forum, I did a post some time ago that goes through the correct way to ensure the level is spot on. Chrysler boxes are very finicky when it comes to the correct levels.
If you end up replacing the box, just get another from a wreckers and put it in.
Regards
Daz
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