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what are you using to change your transmission fluid such that you'd only need about 12 quarts?
I'd assume you're using the pan check hole to drain and fill ...and that only gives you access to 7quarts ...more or less. So once you drain that all using a vacuum pump device ...and push 7 quarts back in, dont you have to run the car and put the trans thru some gears to get the new fluid you just put in moved thru the trans?
After which point, you would drain it again...but now (assuming a good mixing occurred) you have mixed that remaining 30% of old fluid in with your 70% new. So when you dump the next 7 quarts, you would still have about 1 quart of old fluid in after using 14 quarts of new fluid (already more than the 12 quarts you get with two cases).
Is that basically just what is expected and we just live with that as diy'ers vs hooking it up to some special machine that does a full power flush?
I plan on doing a full fluid flush of my trans soon and I want to make sure the way I'm gonna do it is the right way. 10% old fluid isn't too bad if the total investment is 120 bucks or so for fluid and the hundred for the manual pump/vacuum + whatever container i can find to hold the old fluid.
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