Auto trans fluid change
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Not really a good way to change all the fluid out unless you had an endless amount of fresh fluid and a way to enter it into and exit from the system, then run the trans and flush the fresh fluid thru it maintaining the level... Maybe disconnect the trans cooler lines and fill thru one and exit thru the other..
I'm not sure how dealers do the "flushes" but I'd be willing to bet, the only replace what they drain out of the pan.. Pretty much pointless..
Burning Brakes
Joined: Jul 2011
Posts: 1,100
Likes: 112
From: Fredericksburg Virginia
Dealers and a lot of shops use a machine that hooks to the cooler lines. You start car and while it pumps out old, the machine pumps in new. I would never do this method. They don't do filter or drop pan. I drop pan and do the filter. Then disconnect line and start car to pump old out while I am pumping fresh into the pan. I cycle enough through until new fluid is coming out for a quart or two. Works fairly good on most cars and assures upper 90% of fluid is replaced.
Chris
Chris
