Changing transmission fluid
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Senior User
Joined: Nov 2008
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From: Gifford, IL
Changing transmission fluid
I've got a factory rebuilt transmission thats got about 35k miles on it now and I've been thinking about changing the fluid. Is it worth it? I know some people swear on changing it every 30k miles, but there are also those out there who never touch it and have never had any problems. I don't exactly drive it easy all the time and I have done the normal mods to increase the hp on the truck. How exactly do you change it? Just drop the pan and drain it out? Any idea what it would cost to do it myself?
Posting Guru
Joined: Nov 2001
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From: Ft Scott
You could drop the pan and do it yourself but you probably wont be able to change it all. Ford quit putting drain plugs in the torque convertors around 2001. There's a good chance that your rebuilt tranny doesn't have drain in the TC.
This was written for a Souper Dooty but the procedure is the same for an OBS truck.
TheDieselStop.Com 1999-up FAQ
This was written for a Souper Dooty but the procedure is the same for an OBS truck.
TheDieselStop.Com 1999-up FAQ
Hotshot
Joined: Oct 2003
Posts: 17,795
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From: Ashland City, TN
All that I know is, you either make a choice to change AT's or to leave them be.
if you change, you have to set up a milage that you are going to continuously change them at, like 30k lets say. So every 30k you want to change it from now on.
That is my theory on it.
if you change, you have to set up a milage that you are going to continuously change them at, like 30k lets say. So every 30k you want to change it from now on.
That is my theory on it.
Hotshot
Joined: Oct 2003
Posts: 17,795
Likes: 99
From: Ashland City, TN
I think it's better for the clutches IMO.
It does go bad and gets burnt up.
But the reason you don't change it after so many miles, if you have never changed it, is due to the build ups the fluid makes that is what the trans relies on then to work. So you change the fluid, and ATF has chemicals in it to clean, so the chemicals clean out the gunk that makes it work.
It does go bad and gets burnt up.
But the reason you don't change it after so many miles, if you have never changed it, is due to the build ups the fluid makes that is what the trans relies on then to work. So you change the fluid, and ATF has chemicals in it to clean, so the chemicals clean out the gunk that makes it work.
