Differential fluid change - Additive? - Ford Truck Enthusiasts Forums



1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Differential fluid change - Additive?

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-20-2007, 10:59 PM
bustedflush bustedflush is offline
Junior User
Thread Starter
 
Join Date: Apr 2007
Posts: 52
bustedflush is starting off with a positive reputation.
Differential fluid change - Additive?

1990 f250 e4od, Sterling 10.25, Dana 50.

Changed the gear oil in both differentials, Bought the expensive stuff -GL-5 Plus for limited slip differentials. Do I still have to add the friction modifier?
Reply With Quote
  #2  
Old 06-20-2007, 11:40 PM
Silver Streak Silver Streak is offline
Postmaster
 
Join Date: May 2002
Location: Broken Arrow, OK
Posts: 3,235
Silver Streak is gaining momentum as a positive member of FTE.
Yes, add the modifier. I'm running the high dollar synthetic fluid in both of my trucks. It's supposed to have the modifier in it already, but they chatter when I turn.
Reply With Quote
  #3  
Old 06-20-2007, 11:49 PM
bustedflush bustedflush is offline
Junior User
Thread Starter
 
Join Date: Apr 2007
Posts: 52
bustedflush is starting off with a positive reputation.
Thanks, I just wanted some reassurance before I dropped another $24 for the additive
Reply With Quote
  #4  
Old 06-21-2007, 09:50 AM
Bruce R Leech Bruce R Leech is offline
Elder User
 
Join Date: Feb 2007
Location: Mulege south Baja ca. Mx.
Posts: 707
Bruce R Leech is starting off with a positive reputation.
Quote:
Originally Posted by bustedflush
Thanks, I just wanted some reassurance before I dropped another $24 for the additive
wow it costs 24 bucks for that little 4 oz tube . I get it here for 2 bucks.
Reply With Quote
  #5  
Old 06-21-2007, 09:14 PM
bustedflush bustedflush is offline
Junior User
Thread Starter
 
Join Date: Apr 2007
Posts: 52
bustedflush is starting off with a positive reputation.
Quote:
Originally Posted by Bruce R Leech
wow it costs 24 bucks for that little 4 oz tube . I get it here for 2 bucks.
It's 8 bucks a tube here and the manual calls for 1 in the front and 2 in the rear! (so to speak)
Reply With Quote
  #6  
Old 06-21-2007, 09:27 PM
TheSharkster TheSharkster is offline
Freshman User
 
Join Date: Jun 2007
Posts: 29
TheSharkster is starting off with a positive reputation.
When changing the rear differential lube, how should one go about cleaning out the housing and gears before re-lubing the differential?

1989 F150 4X2 355 non LS
Reply With Quote
  #7  
Old 06-21-2007, 09:41 PM
bustedflush bustedflush is offline
Junior User
Thread Starter
 
Join Date: Apr 2007
Posts: 52
bustedflush is starting off with a positive reputation.
If you just drain all the old fluid and put new fluid in you should be fine but if you want to be very thorough...Drain all the old fluid. Put about 1/2 to 1 qt of new fluid in and roll the truck up and down the driveway once. - don't drive it, just spin the wheels a little to get the new fluid to "rinse" the inside of the housing and gears. drain again and refill. don't forget to add the really expensive additive if necessary.
Reply With Quote
  #8  
Old 06-21-2007, 09:42 PM
brown 4x4 brown 4x4 is offline
Posting Guru
 
Join Date: Jan 2001
Location: Nebraska
Posts: 2,358
brown 4x4 is starting off with a positive reputation.
Where'd you get it? It's fairly cheap from Ford (definately under $10 a bottle) and it's guaranteed to be the right stuff. I don't know about some of that stuff in tubes at the parts stores.
Reply With Quote
  #9  
Old 06-21-2007, 09:43 PM
TheSharkster TheSharkster is offline
Freshman User
 
Join Date: Jun 2007
Posts: 29
TheSharkster is starting off with a positive reputation.
Was that 1 bottle or 2 in the rear??? Lmao... Thanks....
Reply With Quote
  #10  
Old 06-21-2007, 09:49 PM
brown 4x4 brown 4x4 is offline
Posting Guru
 
Join Date: Jan 2001
Location: Nebraska
Posts: 2,358
brown 4x4 is starting off with a positive reputation.
The 10.25" rear end calls for 8 oz. of friction modifier; the 8.8" rear end takes 4. I'm not sure how much is in the Ford bottles, I always add one to my half ton.
Reply With Quote
  #11  
Old 06-21-2007, 09:53 PM
TheSharkster TheSharkster is offline
Freshman User
 
Join Date: Jun 2007
Posts: 29
TheSharkster is starting off with a positive reputation.
The Chilton says that my non LS only needs sae 80 or 90 without the modifier. Should I think differently? No sense spending the money if I dont need to. (Right busted??...lol)

I'm sure glad you guys have a sense of humor....
Reply With Quote
  #12  
Old 06-21-2007, 10:26 PM
bustedflush bustedflush is offline
Junior User
Thread Starter
 
Join Date: Apr 2007
Posts: 52
bustedflush is starting off with a positive reputation.
Quote:
Originally Posted by TheSharkster
The Chilton says that my non LS only needs sae 80 or 90 without the modifier. Should I think differently? No sense spending the money if I dont need to. (Right busted??...lol)

I'm sure glad you guys have a sense of humor....
don't worry about it then. you only need it on certain models. But you probably want to buy the gear oil for LS diffs - GL-5 rated.

Last edited by bustedflush; 06-21-2007 at 10:29 PM.
Reply With Quote
  #13  
Old 06-21-2007, 10:33 PM
ford390gashog's Avatar
ford390gashog ford390gashog is offline
Post Fiend
 
Join Date: Jan 2004
Location: Brentwood,CA
Posts: 14,850
ford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to allford390gashog is a name known to all
You only need the additve if you have a L/S. Go check the door tag and find the axle code and report back. A letter then a number will mean a L/S
Reply With Quote
  #14  
Old 06-21-2007, 10:51 PM
Bruce R Leech Bruce R Leech is offline
Elder User
 
Join Date: Feb 2007
Location: Mulege south Baja ca. Mx.
Posts: 707
Bruce R Leech is starting off with a positive reputation.
Quote:
Originally Posted by TheSharkster
When changing the rear differential lube, how should one go about cleaning out the housing and gears before re-lubing the differential?

1989 F150 4X2 355 non LS

If it gets a little dirty while you are working on it witch they do when I am laying in the dirt and the wind is blowing 20 MPH. I use a small pump up garden sprayer with solvent in it and give it a good flush just before you put the cover on
Reply With Quote
  #15  
Old 06-21-2007, 10:56 PM
brown 4x4 brown 4x4 is offline
Posting Guru
 
Join Date: Jan 2001
Location: Nebraska
Posts: 2,358
brown 4x4 is starting off with a positive reputation.
A can of brake clean works good too. Just make sure you get it all out. The 8.8" has a little cavity at the bottom that will collect it. I don't know for sure about the 10.25".
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
front differential seal 1988 ford 150 88_F0RD 2011 & Newer Explorer 4 08-26-2016 06:17 PM
Rear Differential Fluid Change With Valvoline Synpower Texas Bob 1999 to 2016 Super Duty 1 06-17-2012 11:03 AM
Rear Differential Fluid Change With Valvoline Synpower Texas Bob 6.0L Power Stroke Diesel 2 06-16-2012 03:52 PM
Mobil or Ford recommended fluid for differential? Dyllan78 6.0L Power Stroke Diesel 8 01-30-2011 08:59 PM
Changing differential fluid carpe_diem Clutch, Transmission, Differential, Axle & Transfer Case 2 06-06-2003 11:44 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1989, additive, change, diff, differential, end, f150, f250, fluid, limited, oil, quantity, rear, rearend, slip

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 02:48 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.