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Differential fluid change.

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Old 12-30-2008, 06:57 AM   #1
akcrxnj
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Differential fluid change.

All - I was searching the site looking for a how-too in regards to changing out the fluid in the front and rear diffs. Does anyone know if this information is posted up on forum? Is the fluid change hard to do? I have a 99 explorer sport 4wd. Thanks.
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Old 12-30-2008, 08:01 AM   #2
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i believe the front is gonna the bigger PITA since it's stuffed in the front end but basically for either end you remove the bolts from the covers except for a couple at the top just loosen them get your drain bucket underneath and crack open the covers and let it drain out. then remove the covers reseal em bolt then back on and refill the diffs.

about all there is to it not entirely difficult just time consuming.

Dunno about any stickies on here but I sure someone will be along to post one for ya.
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Old 12-30-2008, 10:14 AM   #3
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For the rear, remove the cover, drain, clean, reseal, and fill.

For the front, purchase a suction gun, remove the fill plug, fish the hose to the bottom of the housing, and suction the gear lube out. Be sure to have the lube warm first. Alternatively, there are many shops that have a machine that is designed to do all that very easily. Call and ask if they have the capability to service a diff by sucking the old oil out.




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Old 12-30-2008, 10:33 AM   #4
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x2 on the suction gun. i also used it to fill the rear with fluid, the fill plug on the 8.8 is in a weird spot that makes working on it while laying on your back on gravel kind of a pain.




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Old 12-31-2008, 06:09 PM   #5
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Thanks all - I have a suction gun and will probably be going that route. One last question I had was what type of gear oil should be used in the diffs?
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Old 12-31-2008, 06:17 PM   #6
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Thanks all - I have a suction gun and will probably be going that route. One last question I had was what type of gear oil should be used in the diffs?
Page 248-249 of your owners manual.

Or if you dont have one, download a PDF copy from:
http://www.motorcraftservice.com/?li.../99expog1e.pdf




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Old 12-31-2008, 07:09 PM   #7
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dont they call for 75/140 synthetic with friction modifier? its expensive, i just use valvoline 80/90 and a tube of friction modifier.




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Old 01-01-2009, 10:48 AM   #8
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I was looking at the manual and it states that the front should get 80w90 and the rear either 80w90 or 85w140 + friction modifiers. I noticed some threads where it looks like some forum members just went ahead and used 85w140 in both front and rear. I was thinking of doing this as it would be convenient to use the same oil in both diffs. Is there an issue with running the 85w140 in both front and rear? Lastly I noticed that Royal Purple makes a gear oil which states you do not need any additional friction modifiers.

Royal Purple Gear Oil - http://www.royalpurple.com/gear-oil.html
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Old 01-01-2009, 11:03 AM   #9
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I have seen posi chattering from Royal Purple in our Cobras. I would use the modifier with it if it were me. You can also add it later if you need it and try it like it is. As to what oil, you are on your own if you deviate from factory recommended fluids. However, let's get real. We all know there are outstanding products we can use. Synthetics for example. I'm not going to tell you to use 85W-140 in the front diff. What I am going to say is there are Explorers running around just fine with it in there. Hope that helps you decide.




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