Transmission "Flush" with syringe

How are you going to properly refill it?
What if you can't get the fill plug off?
Do you know what a "drain plug" is? Why would you have to suck it out with a syringe?
How big is this syringe? It would need to be able to move 4L of ATF in one go, so you can get that drain plug back onto place without losing too much ATF.

FYI; a proper flush would involve disconnecting the ATF cooling lines from the radiator. ATF going into the radiator gets dumped into a can, the new stuff goes back to the transmission on the return line. There's no good reason to flush this transmission, it's a planetary gear style.- so most of it's wear happens during break-in.

 

Agree with the post above. OP, you're over complicating a simple drain and fill operation.

It's very similar to an oil change. Open fill plug, remove drain plug and let gravity do its thing. Replace drain plug, and fill the transaxle either with a funnel and tube, or you can use your syringe.

SM-G781V ?

 

only problem is you need a lift or four jack stands