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Old 05-03-2015, 07:22 AM   #111
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Originally Posted by elsolo View Post
There is no sucking of fluid. The cooler outfeed will discharge under pressure, but there will be no sucking up of fresh fluid
That's correct. The inlet hose on the tranny from transmission cooler just dumps into the case; it cannot "suck" fluid. The fluid is pumped from the outlet on the tranny to the cooler and then back to the case.
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Old 05-04-2015, 07:52 AM   #112
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What's meant by "sucking fluid" is instead of mixed old and new fluid being drawn from the pan as described originally, new fluid is. As the fluid in the torque converter and rad cooler lines cycles thru the open line, it is replaced by fresh fluid, not mixed. Now when it comes thru clean you are done. Just top the trans off.
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Old 05-04-2015, 02:31 PM   #113
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'As the fluid in the torque converter and rad cooler lines cycles thru the open line, it is replaced by fresh fluid, not mixed.'

Not even..................the fluid is heavily mixed in the convertor with the old fluid and if waiting till what comes out is 'clean' you waited long enough to ruin some extra fluid. The convertor impeller is frothing that new fluid with the old like Momma's electric mixer, no way on earth does it simply come out dirty then suddenly clean. Absolutely no way. The dirty fluid is coming in to mix from 3 different locations in the convertor there.

AND, would you run the engine with no oil pressure as long as you do when changing fluid like this???..........or what you are doing to the trans, when you dump that line in the bucket you just killed your lube feed to 3/4 of the trans, all of the mainshaft bushings get fed from that but no oil as long as the tube is in the bucket. Zero oil pressure to trans while running it........real smart. Look up a fluidchart on the trans and see what the 'lube 2' oil circuit feeds and how it is supplied, from the ass end of the oil cooler.
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Old 05-04-2015, 03:01 PM   #114
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You're reading too much into the post. I was agreeing with coolkatz's method. Drain, and then add new fluid. As you drain into the bucket, watching the fluid level as he said, clean fluid will eventually start coming out. Of course it gets mixed some before it is all replaced.
Maybe I misunderstood the original post . Not sure why you would pump fluid out before you drop the pan. That's where I see the risk to damage you mention is. Not when cranking and watching for fresh fluid to come out the tube (while maintaining a healthy level)

Last edited by In a Focus group; 05-04-2015 at 06:18 PM.
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