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Old 01-10-2011, 07:32 PM   #1
Bigblue78
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Rear Differential Fluid

I went to get an oil change on my 2002 Ford Explorer, which has 130K miles, and the guy tells me that I need to replace my rear differential fluid every year or every 30K miles any truth to this?

New to the site and new to car forums just found out about this.

Thanks
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Old 01-10-2011, 10:02 PM   #2
IAmTodd
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I would say 100k miles a good service interval, 75k to be on the safe side. 1 year/30k is way to often.
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Old 01-14-2011, 06:07 PM   #3
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The quality of fluid is critical to how long it can go. For cheap gear lube once a year or two is good. But our trucks call for synthetic gear oil, that is why it's rated to go 100k etc.

Buy the best gear oil, either the too high Ford stuff, or Amsoil for about $11 per quart. I like the Amsoil, the severe gear is the best.
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98 Mountaineer 18's Zexel-Torsen diff, suspension work,12.75" x 1.25" rotors etc., 347 4WD soon.
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Old 01-17-2011, 09:06 PM   #4
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Thanks is it fairly easy to do?
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Old 01-17-2011, 10:32 PM   #5
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The 2002+ models should be easier to do the gear oil than past models. The rear cover has a large drain hole in it, plus a fill hole. I'll let someone else say how the level is set, I've just seen those nice aluminum covers. All older Fords have a hole in the side of the rear housing.

Usually the best way to add gear oil is to buy a generic pump from a parts store. They are less than $10 and make it simple to connect to any container and pump with a hose into the needed hole.
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