transmission fluid changing question

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Jan 7, 2008 | 10:09 AM

electraglide

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Joined: Dec 2007

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transmission fluid changing question

I have a 99 F250 SD and i have 136000 miles on it. I bought the truck used and was wondering if i should cange the transmission fluid and filter since i dont know for sure if it has been changed. I heard that you should not change it after it gets on up there in miles.

Jan 7, 2008 | 10:14 AM

Pocket

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Joined: Jun 2004

Posts: 9,293

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From: Parker, CO

Go ahead and change it. If the trans is going to die, it will do it regardless of fluid change.

Many people out there don't change the fluid or maintain the trans like they are supposed to. Then when the trans starts acting up they go ahead and flush it out hoping that will fix it. Trans dies anyway and that's how wives tales start.

Jan 7, 2008 | 11:22 AM

Izzy351

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Joined: Feb 2007

Posts: 14,541

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From: Dallas-Ft. Worth

Yep -- get it changed. There is an easy trans flush procedure here:
http://www.7point3.com/Writeups/TransFlush.aspx

And there is more than one way to skin this cat.

Jan 7, 2008 | 01:58 PM

missouguy

Elder User

Joined: Oct 2003

Posts: 640

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Quote:

Originally Posted by Izzy351

Yep -- get it changed. There is an easy trans flush procedure here:
http://www.7point3.com/Writeups/TransFlush.aspx

And there is more than one way to skin this cat.

I have used this method and it is quite simple. Couple hours work at the most.

Frank

Jan 7, 2008 | 04:38 PM

ken kenmnedy

Posting Guru

Joined: Nov 2006

Posts: 1,296

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From: muskegon mi.

YES YES get it flushed and change the filter that way you know what you have got. I did mine.now as I gas it up when its in overdrive it holds on just a little longer and only slips a little in 2nd gear.got the truck from the repo lot they got it from a body shop, so it was probly stolen and whiped but I can live with this!!!

Jan 7, 2008 | 06:39 PM

Citypol86

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Joined: Dec 2007

Posts: 325

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From: Lower Hudson Valley, N.Y.

This is for the 4R100. Is there a different procedure for the 5R110W? Is the theory the same for ANY trans?

Last edited by Citypol86; Jan 7, 2008 at 06:40 PM. Reason: Addition

Jan 7, 2008 | 09:09 PM

salesman112

Senior User

Joined: Jun 2007

Posts: 124

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From: brighton, ill

I Have 74k And Recently Flushed My Tranny And Changed In Line Filter Not The Internal Filter(recommended By Ford Every Other Tranny Flush Which Should Occur At 60k Intervals) I Am Very Pleased With The Flush And Notice Tranny Down Shifting Less When Going Up Hills.

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Jan 13, 2008 | 06:57 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,714

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From: SE Florida

Quote:

Originally Posted by Citypol86

This is for the 4R100. Is there a different procedure for the 5R110W? Is the theory the same for ANY trans?

The theory is the same for almost any trans. Some need some special steps added, and the TorqShift (5R110w) is one of those transmissions that need a change.

The TorqShift has a thermostat. When the trans is below about 165F it only sends 10% of the normal flow to the coolers. 90% is sent back into the trans. If you don't heat the trans well about 165F AND heat the new fluid that goes in you'll just mix the old and new and change only some of the old fluid and a lot of the new fluid.

That procedure is also here at FTE. https://www.ford-trucks.com/article/...nsmission.html lI've used this procedure on a lot of different cars and trucks. The trick is in knowing what's different about each different trans.