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Hey all. Having an issue with my 2008 6.4, 122k miles. The transmission temp sensor went out exactly 2 months ago so I took it to a local diesel shop to drop the pan and change out the sensor. Everything seemed fine until 3 weeks ago when I noticed ATF leaking from the front of the bell housing where it mates to the engine. The manual called for 8 quarts of ATF to be added, however the shop added 10. I suspected this may have been what caused the leak, so I took it back and they insisted that the tranny needed 10 because that’s what came out, and that the front pump seal had simply just given out (independent of the work they had done), so they charged me $500 to drop the transmission and change the seal. Whatever. I paid them the $500 and drove home, but it started leaking again within an hour. Brought it back to them today (they don’t keep Saturday hours but seemed obligated and gracious to help to get the problem solved) because they thought it could be an o-ring around the pump body that could be leaking. So they dropped the tranny again, checked it, and everything looked fine. They’re kind of at stumped at this point so I was wondering if y’all had any insight. Following are 2 pics of the leaks under the truck, 2 pics from inside the bell housing on the initial tranny drop before they replaced the front pump seal, and 2 pics from today when they pulled the converter out to check that seal. They said Monday they’re going to have the converter checked out and tested, whatever that entails, I do not know. Any advice would be hugely appreciated. Thanks guys.
 

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Well... The golden question here, did anyone think to check the dipstick? Is the trans actually overfull or not? Just because they think they took out 10qts doesn't mean its automatically what they should put back in :look:

If it was overfull to begin with, that doesn't mean you ignore what the book says. Thats like saying: "We drained 18qts of oil out of your 6.4, we need to put 18 back in!"
 

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Yes, they checked it when I brought the truck in Thursday and claimed the level was fine, which seemed counter-intuitive, because how could the level be correct if it had been leaking for 2-3 weeks. That would indicate it was over filled, and leaked to the correct level when they checked it. Question does arise though, why wouldn’t it have weeped from the overflow valve on the top of the bell housing when the fluid expanded if it was in-fact over filled.
 
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