Actually expy is a nickname for Expedition. And Triton is the type of motor. As far as I know, without reinventing litterealy everything your stuck installing the same if not close year replacement motor. We do have a member here that's trying to shoehorn a v10 and 4r100 engine out of an Excursion. Stay tuned and see if it fits, and how much cutting/welding he does!
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