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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

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  #1  
Old 06-20-2007, 09:59 PM
bustedflush bustedflush is offline
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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?
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Old 06-20-2007, 10:40 PM
Silver Streak Silver Streak is offline
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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.
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Old 06-20-2007, 10:49 PM
bustedflush bustedflush is offline
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Thanks, I just wanted some reassurance before I dropped another $24 for the additive
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Old 06-21-2007, 08:50 AM
Bruce R Leech Bruce R Leech is offline
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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.
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Old 06-21-2007, 08:14 PM
bustedflush bustedflush is offline
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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)
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Old 06-21-2007, 08:27 PM
TheSharkster TheSharkster is offline
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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
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Old 06-21-2007, 08:41 PM
bustedflush bustedflush is offline
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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.
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1990 F250 4X4,7.5L,E4OD, Sterling 10.25, Dana 50, 150k, 9 MPG towing or not.
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Old 06-21-2007, 08:42 PM
brown 4x4 brown 4x4 is offline
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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.
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Old 06-21-2007, 08:43 PM
TheSharkster TheSharkster is offline
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Was that 1 bottle or 2 in the rear??? Lmao... Thanks....
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Old 06-21-2007, 08:49 PM
brown 4x4 brown 4x4 is offline
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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.
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Old 06-21-2007, 08:53 PM
TheSharkster TheSharkster is offline
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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....
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Old 06-21-2007, 09:26 PM
bustedflush bustedflush is offline
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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.
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Last edited by bustedflush; 06-21-2007 at 09:29 PM.
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Old 06-21-2007, 09:33 PM
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ford390gashog ford390gashog is offline
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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
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Old 06-21-2007, 09:51 PM
Bruce R Leech Bruce R Leech is offline
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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
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Bruce
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Old 06-21-2007, 09:56 PM
brown 4x4 brown 4x4 is offline
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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".
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Old 06-21-2007, 09:56 PM
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