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Originally Posted by blazes9395
For these trucks running the 4L60e, 700R4, or any other transmission for that matter, the fluid is pushed through the cooler lines as the pump picks fluid up in the pan, so to flush it, you need a machine to push the fluid back into the transmission, because it does not suck it up. I have done several flushes and if you don't have a flush machine, you need to add fluid through the dipstick, and it will flow out the bottom cooler line-no sucking. Think about it, if it sucked fluid through the cooling circuit, you would have collapsing cooler lines if they were rubber(anyone who has a external cooler installed will know), or a 4t60(5)e, which has rubber hose endings installed from the factory, also oil would not leak if you had a leak, because it would be sucking it up, it would only leak when the engine was off.
Also, I have heard about the wal mart/fast lubes putting the wrong fluid in transmissions, like fords requiring Mercon fluid and gettting Dexron, or Type 7176/ATF+3, which is for Chrysler or vise versa. Yeah, be careful where you take it.
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There is nor sucking, the transmission pump is pushing the fluid through the cooler and there is not sucking action at all.
All the fluid change unit does it supply fresh fluid through the return line while the machine fills with the old fluid. I watched it myself and the machine has zero power hooked to it.
It is not pushing or pulling, it is allowing the pump to push the ram which is pshing the new fluid into the return line.