1. A car ran over the cat.
2. A car ran the cat over.
I think that in both sentences, 'a car' is the subject of the sentence. I can see two possible interpretations of the predicate. In one case, 'ran over' is the action verb with 'the cat' being a predicate object. For the other interpretation (my personal preference), 'ran' is the verb with 'over the cat' being a prepositional phrase with 'over' as the preposition, and 'the cat' being its object.
Regardless of your predicate interpretation, I find #1 preferable because you should neither split the action verb, nor alter the prepositional order.
Good Luck
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