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Stock 2002 - 2005 Explorers Questions related to non-modified 2002 - 2005 Explorers and Mountaineers. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications. Sport Trac and Sport use the 1995-2001 forum.

2002 explorer rear diff fluid change

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Old 10-15-2011, 01:04 AM   #1
southern cal
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2002 explorer rear diff fluid change

Any one have an idea the steps to change diff fluid from the rear diff, its independent suspension
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Old 10-15-2011, 07:20 AM   #2
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Old 10-15-2011, 09:39 AM   #3
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this pump actually makes the filling much easier since you don't have to be under the truck. It's available in Walmart and any Auto parts store. Way cheaper in Harbor Freight ($4-$6 depending on the coupon)

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Old 10-15-2011, 11:33 AM   #4
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Originally Posted by ivrb View Post
Any one have an idea the steps to change diff fluid from the rear diff, its independent suspension

Besides the info you got from other people in here on this rear diif fluid change job, you will need to find out if your rear diff is a "Limited Slip" differential. If you DO HAVE a Limited Slip Diff, you will need to add 4 ounces of Friction Modifier along with the new gear oil. Rear Diff holds approx 1.60 to 1.75 quarts of oil, so 2 quarts of new gear oil will do the job, Mobil 1 75W-140 Full Synthetic or equivalent brand. Friction Modifier comes in a squeeze tube and costs about $6-$7 in a parts store or buy Fords own brand from a Ford dealership. Ford recommends this additive BTW for Limited Slip diff's.
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Old 10-16-2011, 09:29 AM   #5
Thomas Mackin
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Ford also recommends changing what they called for to the heavier oil. I have had great luck with Amsoil 75-140 which is thetype Ford now recommends. Also I used the Amsoil friction modifier because I have the limited slip. If you do the front one use the 75-90 and no modifier but you will have to use your pump to suck out the old through the fill port because ther is no drain. A good idea if you have high mileage and use the 4x4. Do not forget to put a sealer on the threads of the plugs.
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Old 10-17-2011, 08:20 AM   #6
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I don't have limited slip but I do suffer from the all-to-common rear end whine. I filled with one bottle of Ford's heavier diff oil and a bottle of Lucas oil treatment. The whine is about at 1/3 the level it was before. Better than I expected.

Lucas states that one could use their "additive" exclusively in a diff. Not sure if this would result in better performance or a quieter ride.
Also, the stuff is a real bear to pump due to its honey-like viscosity.

'02 XLT 4.6 4x4
'85 Carrera Flatnose
'71 280SL Pagoda
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