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There are two O rings on the 3.0 one at the trans and another that runs through to the backside of the waterpump. I had the exact same issue the part number for the Oring is a Beck/Arnley 039-4003 Advance Auto is where I got mine after searching. But anyways that tube runs across to another Oring in back of waterpump. It will leak and at high pressure blow towards the Oring you are changing making it look like that is the only one leaking. I had to install mine with some permatex let it cure and fixed the issue.
 
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