Transmission Fluid Draining w/ Engine Running

[lelandstanford]

Since only about 4 quarts of transmission will drain out and most of the fluid still in the torque converter and valve body. Is it a good idea to run the engine to pump out the rest of fluid and go thru all gear selection? Assuming engine already warmed up.

[nhparrot]

See HOW-TO: Automatic Transmission Fluid Change

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[USCRacerX]

Originally posted by nhparrot
See HOW-TO: Automatic Transmission Fluid Change

Fix the link. Do not have admin access.

[nhparrot]

USCRacerX
The link is fine and does not require admin access. Access to threads posted in the "Garage", such as the thread "HOW-TO: Automatic Transmission Fluid Change", is only authorized to TundraSolutions Club Members. For information about upgrading your membership, refer to Club Subscription

For more info on what is available in the "Garage" see INFO: Index of FAQ's, "How-To's" and Information Available on TundraSolutions.com

[acme]

You can run the engine while draining the trans, but you have to pour fluid in the the same time. I pulled the plug ,(actually unhooked the trans cooler line), started the motor and poured the trans fluid in the funnel so you are replacing the fluid the same time. The pump sucks the new fluid up and replaces with new fluid.... You waste some , but it works.
This way you get almost all the old fluid out, but be sure you have a BIG container to drain in to so it won't over flow . I did this to a used car i bought a few years back, but used the trans cooler line to drain from (no plug). The fluid came out brown, but turned red and shifted better and lasted a long time. I only did this once.... but it worked..

alan

[Tundra2UZ]

Originally posted by acme
You can run the engine while draining the trans, but you have to pour fluid in the the same time. I pulled the plug ,(actually unhooked the trans cooler line), started the motor and poured the trans fluid in the funnel so you are replacing the fluid the same time. The pump sucks the new fluid up and replaces with new fluid.... You waste some , but it works.
This way you get almost all the old fluid out, but be sure you have a BIG container to drain in to so it won't over flow . I did this to a used car i bought a few years back, but used the trans cooler line to drain from (no plug). The fluid came out brown, but turned red and shifted better and lasted a long time. I only did this once.... but it worked..

alan

So you have to disconnect both trans cooler lines right? One to pour the new fluid into(Return line) and the other line used to drain the old fluid? Or I guess you could just disconnect the Return line and let the old fluid drain from the Transmission Oil Cooler.

Also, how do you know which line is the Return line?

[acme]

Originally posted by Tundra2UZ
So you have to disconnect both trans cooler lines right? One to pour the new fluid into(Return line) and the other line used to drain the old fluid? Or I guess you could just disconnect the Return line and let the old fluid drain from the Transmission Oil Cooler.

Also, how do you know which line is the Return line?

You only have to remove 1 line to do this.
I had to experiment to find which one. I Just disconnected one line at the bottom of the radiator since it had an internal trans cooler (GM truck) and put a pan under it , started the motor for 2 seconds to see if any came spurting out.....If it doesn't and only comes spurting out the cooler/radiator fitting the hose was on , then it's the wrong hose. You will have the right one when the fluid comes out of the hose which is coming from the trans pump.....Not sure about Toyota routing of lines, but it's simple since it's only 2 lines there..
You only have to disconnect one hose to find out, if it comes out of the hose , that's the right one......

TIP: Use a spare trans hose or a small 3/8 hose if you have one to slide over the trans line when you disconnect it , this way you can aim the fluid... it's much cleaner ,less messy..



Alan

[lelandstanford]

What happens if I don't pour in trans fluid while it pumps out old fluid? Will the transmission damage from lack of lub?

[nhparrot]

yes, you need to add fluid as the old fluid pumps out.

[Buzzard]

Originally posted by lelandstanford
Since only about 4 quarts of transmission will drain out and most of the fluid still in the torque converter and valve body. Is it a good idea to run the engine to pump out the rest of fluid and go thru all gear selection? Assuming engine already warmed up.

lelandstanford----if you have a Midas Muffler shop near you, they have a machine that does a full flush. I bought my own fluid (M1). The charged me about $40.00 and took about 20 minutes. ---Buzz

[acme]

Originally posted by lelandstanford
What happens if I don't pour in trans fluid while it pumps out old fluid? Will the transmission damage from lack of lub?

After starting it up , just start pouring the fluid in so it will still circulate and keep things lubed.
I only did this on a truck that needed a change badly and didn't have a drain plug. After i did it i took the pan off and put a plug on it.... Then changed it every 30,000 miles and worked great until i sold it with 182,600 on it ....
Leave your drain plug on so you won't be pouring new fluid out the hole... it will bypass your pump if you do.

alan

[nhparrot]

lelandstanford,
If you follow these instructions > HOW-TO: Automatic Transmission Fluid Change, you should be fine.

The link above is to a "Garage" posted thread which requires Club Membership