Tranny Fluid - Ford Powerstroke Diesel Forum
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Old 05-19-2010, 06:22 PM
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Tranny Fluid

Hope this hasn't been beat to death, but most of the transmission fluid I've been finding is Dex/Merc that says it's compatable with just about everything except newer vehicles. Will this work in my '99? I'm planning on changing the fluid and filter soon, at around 90k. I don't have any problems so far, but since I'm not sure how it was treated in the past, I want to try to make it last as long as I can. I've also heard some people say that changing the fluid will kill a tranny because it frees up loose dirt and stuff, but I have a hard time believing that as long as you do a good cleanup. Any opinions on this? Thanks
Chris
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Old 05-19-2010, 06:40 PM
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Depends on how you change the fluid. If your just gonna drain the pan, then your only changing about 30% of the fluid. You can disconnect on of the cooler lines and run the truck to completeley empty the whole thing, and the TC. That will not ruin it.

What ruins the tranny is when you take it to a shop and the "force" fluid through it. That is what can kill it. You can use Dex/Merc as well.
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Old 05-21-2010, 04:14 PM
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The Dex/Merc meets or exceeds all requirements for your truck. I just had mine done. The fluid can be drained from the pan and my truck had a drain plug in the torque converter too after removing the cover. Got most of the fluid that way.
Be sure to drop the pan and replace the trans filter with a MOTOCRAFT filter. Clean the sediment out of the pan and make sure its clean. The pan gasket is rubber and reusable. I reused mine with 150k miles on it and havent had a problem.
Dont let Jiffy Lube or anyone perform a flush. This will stir up the sediment in the bottom of the pan and send it into the valve body and clutches and very well could cause a problem.

Steve
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