Originally Posted By: 440Magnum
There's absolutely no reason to ever put any additives in a healthy transmission. The grey "slime" is just clutch wear particles, and it doesn't ever accumulate any thicker than what you see in the bottom of the pan. The vertical surfaces in my AT's have never shown any hint of it. And even if they did, I wouldn't put any alleged cleaning spooge in there.
The actual truth is probably somewhere close to you here. While I agree a healthy slushbox is not in "need" of any additives, they all have filters that are little more than a screen door.
So perhaps a magnefine or some other aftermarket filtration is a good move.
Trav has shown remarkable reductions in trans temps with LG red, so I'm sure that someone somewhere could add some and help a bit with fluid life and thus trans life also.