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Old 01-27-2008, 06:04 PM   #1
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98 Ford Explorer Differential Oil Refill


Hello all,

I am trying to locate where to refill the rear diff on my son's 98 Explorer Sport. I pulled the cover, drained out the old fluid, cleaned, gasketed and reapplied the cover. When I went to refill the fluid I was dumbfounded to not find where it gets replenished. It is a 4 wd, 2 door model. All I could see was a small bolt, (13mm) on top of the diff and also a sensor of some sort.

Any Explorer people out there?

Thanks!

Update- fill plug it had been rusted over and wasn't visible. Fluid now changed!

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Last edited by handyman78; 01-28-2008 at 04:41 PM. Reason: Solution Found
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Old 02-01-2008, 11:10 AM   #2
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98 Ford Explorer Differential Oil Refill


Is this the 8.8"? The fill plug should be near the pinion yoke, on the driver side if I remember correctly. It should be a plug you can fit a 3/8" ratchet extension into, but could have changed. The sensor is for the ABS - don't mess with it. Don't forget to add friction modifier - yours is most likely limited slip and they get noisey without the additive. I had some tag #'s and diagrams somewhere...

Try this:

http://www.therangerstation.com/tech_library/Axles.html

EDIT: Ooops, too late.

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Old 02-03-2008, 09:21 AM   #3
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98 Ford Explorer Differential Oil Refill


Thank you- I found it-

Is the friction modifier a product obtained from retail stores like Auto Zone or Pep Boys or is it only a dealer available addin?
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Old 02-03-2008, 09:38 AM   #4
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98 Ford Explorer Differential Oil Refill


As far as I know, it's a dealer thing
But you'll need to find out if you need it
testdummy is correct the Ford limited slip dif needs it
But I don't know if you've got it or not
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Old 02-05-2008, 08:24 AM   #5
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98 Ford Explorer Differential Oil Refill


Autozone carries it. Comes in a squeeze tube. If it's not on the shelf with the gear oil ask for it at the counter.
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Old 02-06-2008, 07:20 AM   #6
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Thanks!
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Old 02-06-2008, 12:32 PM   #7
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98 Ford Explorer Differential Oil Refill


everything and anything you want to know about your son's explorer can be found at explorerforum.com. Its a great board with lots of explorer fans. I used to be on it alot when I had my '91 explorer.

as DIY said it should be up by the pinion yoke
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Old 02-06-2008, 06:01 PM   #8
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Quote:
Originally Posted by DIYtestdummy View Post
Autozone carries it. Comes in a squeeze tube. If it's not on the shelf with the gear oil ask for it at the counter.
Thanks- I got it from Advance Auto Parts on the shelf near the engine supplements- it was $5.00 for the tube by CRC Industries.
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Old 02-07-2008, 08:47 AM   #9
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Quote:
Originally Posted by have2goski View Post
everything and anything you want to know about your son's explorer can be found at explorerforum.com. Its a great board with lots of explorer fans. I used to be on it alot when I had my '91 explorer.

as DIY said it should be up by the pinion yoke


I'm a Jeep man, but I have an 8.8" ready to install. There has been a running joke for many years from explorerforum.com about a guy who got Herculiner on his "hootus." I will say no more to keep it "PG" rated.
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Old 02-07-2008, 06:13 PM   #10
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98 Ford Explorer Differential Oil Refill


i know the story
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Old 09-10-2009, 10:07 PM   #11
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Quote:
Originally Posted by DIYtestdummy View Post
Autozone carries it. Comes in a squeeze tube. If it's not on the shelf with the gear oil ask for it at the counter.


How much of the tube do you use? I have refilled the diff with Lucas 80w90 but I read on the tube not to over use? I also have a 98 explorer sport 4X4. Any suggestions?

Thanks,

Russel
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Old 09-15-2009, 11:26 AM   #12
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98 Ford Explorer Differential Oil Refill


Russ,

Do you know if you have a limited-slip differential? If it's an open carrier, you don't need friction modifier. If it is LSD, read the tube and/or your owner's manual, but I always used to put the whole tube in. I know most Ford 8.8" axles are open carriers with C-clips. Suprisingly, even most of the towing packages don't include limited-slip.

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