Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 1997 - 2003 Ford F150
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 06-06-2014, 04:12 AM   #1
Senior Member
 
Join Date: Jun 2014
Posts: 102
Mentioned: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Default Transmission flush or drop the pan and fill?

Hi guys. I just got a 2001 F150 5.4L lariat. I always like to replace all the fluids when I get an used vehicle. The truck has 159K miles on it. The tranny shifts fine from I can tell. I have read and heard the stories about flushing it with this kind of mileage.

The fluid on the dip stick is not bright red, is like a red brown color. I doesn't smell burnt. The place I had always taken my vehicles to do the "tranny flush" uses a machine that put the fliud thru the tranny fluid dip stick with a small double hose. They turn the vehicle on and the machine has some kind of sensor that will tell when the fluid is clean. The machine then sucks some of the old fluid out and fill some of the new. It continues to do this until the sensor senses the fluid is clean. Will this machine be a safer bet as doing the tranny service? I don't see this machine pressurizing the system. I asked the manager one time about and they said they used to have old flushing type machine but they were having alot of problems after the flush so their company switched to these machines. They say is safer with this machine.

I have done my 1998 firebird transmission service like this three times. I did the 1st one with 46K, and two more after that. The firebird has 139k and not a since issue with the transmission.

I'm very familiar with doing the dropping the pan, change the filter and put in the lost fluid back in.

What to do guys think? Thanks.
jayta98 is offline   Reply With Quote
Old 06-06-2014, 07:38 AM   #2
Senior Member
5 Year Member
 
Join Date: Oct 2009
Posts: 192
Mentioned: 0 Post(s)
Thanks: 3
Thanked 7 Times in 3 Posts
Feedback Score: 0 reviews
Default

Now that is kind of a tricky situation. It's common understanding that when you change the fluid at a high mileage when it hasn't been changed in so long, it generally causes more problems...

I however have never had this problem, I have changed high mileage transmissions before without so much as a hiccup. My bronco had similar mileage, and I changed the fluid soley due to the fact that I was getting torque convertor shudder. Changing the fluid alieviated the problem. However, on these transmission I don't know how they would react. I would suggest changing just the fluid in the pan, and the filter. It'll only change about half the fluid, but you get a fresh filter in there...

Other than that I wouldn't change all the fluid completely unless it gets burnt.


I just changed the fluid on my 2001 with 100k miles. The fluid was nice, red and clean still when I drained it but I changed the fluid in the pan, and drained the torque convertor.


We should get some more opinions.
tonyroc14 is offline   Reply With Quote
Old 06-06-2014, 07:49 AM   #3
Senior Member
 
allinon72's Avatar
 
Join Date: Dec 2011
Posts: 1,233
Mentioned: 0 Post(s)
Thanks: 3
Thanked 46 Times in 41 Posts
Feedback Score: 0 reviews
Default

I would do a pan drop and filter change, but I would not do a flush at that mileage. The flush is what causes problems - all the debris/particles are dislodged and end up getting in areas of the transmission that you don't want. Nothing is disturbed when you do a pan drop - granted not all the fluid is removed, but since your transmission shifts fine now, it's a much less risky alternative.
__________________
Project Silver XL
allinon72 is offline   Reply With Quote
Old 06-06-2014, 07:52 AM   #4
Looking for a Henway.
 
blupupher's Avatar
 
Join Date: May 2013
Location: Katy, Republic of Texas
Posts: 925
Mentioned: 4 Post(s)
Thanks: 52
Thanked 64 Times in 49 Posts
Feedback Score: 2 reviews
Default

I would (and did) drop the pan and change the filter.
I also added a drain plug to my pan so over the next few weeks I can drain and replace the fluid 2-3 times to basically end up with a complete fluid change.
blupupher is offline   Reply With Quote
Old 06-06-2014, 07:59 AM   #5
Senior Member
5 Year Member
 
Join Date: Oct 2009
Posts: 192
Mentioned: 0 Post(s)
Thanks: 3
Thanked 7 Times in 3 Posts
Feedback Score: 0 reviews
Default

well You don't really need to "flush" the system either. You can remove nearly all of the fluid buy draining the torque convertor as well. The TC has a drain plug, and it holds like 5 quarts or something like that. The rest of the fluid would be in the cooling lines and the cooler. You can disconnect that from your transmission, and blow compressed air through to get the fluid out. You only need 20psi or so of air, just enough to move the fluid through, not force it. After that it will take nearly 14 quarts to fill the transmission up properly.
tonyroc14 is offline   Reply With Quote
Old 06-06-2014, 08:10 AM   #6
Looking for a Henway.
 
blupupher's Avatar
 
Join Date: May 2013
Location: Katy, Republic of Texas
Posts: 925
Mentioned: 4 Post(s)
Thanks: 52
Thanked 64 Times in 49 Posts
Feedback Score: 2 reviews
Default

Quote:
Originally Posted by tonyroc14 View Post
well You don't really need to "flush" the system either. You can remove nearly all of the fluid buy draining the torque convertor as well. The TC has a drain plug, and it holds like 5 quarts or something like that. The rest of the fluid would be in the cooling lines and the cooler. You can disconnect that from your transmission, and blow compressed air through to get the fluid out. You only need 20psi or so of air, just enough to move the fluid through, not force it. After that it will take nearly 14 quarts to fill the transmission up properly.
'01 does not have the plug on the converter (I think it stopped in '99 or '00).
blupupher is offline   Reply With Quote
Old 06-06-2014, 01:06 PM   #7
Senior Member
5 Year Member
 
Join Date: Oct 2009
Posts: 192
Mentioned: 0 Post(s)
Thanks: 3
Thanked 7 Times in 3 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by blupupher View Post
'01 does not have the plug on the converter (I think it stopped in '99 or '00).
thats incorrect. They stopped half way through 01. I have an 01, and mine has one...

Granted, the OP may, or may not have one...
tonyroc14 is offline   Reply With Quote
Old 06-06-2014, 03:29 PM   #8
Looking for a Henway.
 
blupupher's Avatar
 
Join Date: May 2013
Location: Katy, Republic of Texas
Posts: 925
Mentioned: 4 Post(s)
Thanks: 52
Thanked 64 Times in 49 Posts
Feedback Score: 2 reviews
Default

i read of those with a '99 without them too though?
blupupher is offline   Reply With Quote
Old 06-06-2014, 03:31 PM   #9
Senior Member
5 Year Member
 
Join Date: Oct 2009
Posts: 192
Mentioned: 0 Post(s)
Thanks: 3
Thanked 7 Times in 3 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by blupupher View Post
i read of those with a '99 without them too though?
don't know? Depends on your trans I suppose
tonyroc14 is offline   Reply With Quote
Old 06-06-2014, 11:27 PM   #10
Senior Member
 
Join Date: Jun 2014
Posts: 102
Mentioned: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Default

Thanks for all the replies guys. I will just do the pan and filter. How hard is to add a drain plug to the tranny pan?
jayta98 is offline   Reply With Quote
Old 06-06-2014, 11:27 PM
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Join F150 Forum

 

The Mustang Source
All times are GMT -4. The time now is 12:59 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.