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What does it say in the Mopar Performance catalog? I've never seen them fail to note if something needs clearanced, and how much. I'm with Sniper, I've NEVER seen a 4.0 pump die. It's usually the bearing clearances opening up that drops the oil pressure. But what do I know, one of mine has 300K on the clock, and the "new" one only has 250K on the clock. Neither have ever been apart. Both do sound like Isuszu diesels though.
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