rear differential fluid
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Junior User
Joined: Sep 2004
Posts: 78
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From: Houston
rear differential fluid
Maintenance guide states not to change the rear differential fluid. Why is it not necessary? Do you change yours? Any experienced opinions?
2000XLT 5.0 148k mi 2wheel
2000XLT 5.0 148k mi 2wheel
More Turbo
Joined: Jan 2005
Posts: 572
Likes: 37
From: Carthage, Mo
When I checked mine awhile ago after the seals started leaking, it was silvery with metal particles. I changed it then until I got a chance to do the seals & bearings a few hundred miles later. It was clear then. I don't care what the manual states, I'm changing mine on every vehicle at about 50k. It only makes sense to get rid of the particles from everything breaking in. That statement was probably written by the same genius that claims that "the transmission does not require maintenance." I found that brilliant statement after I couldn't find my non-existent dipstick.
Laughing Gas
Joined: Jan 2005
Posts: 1,055
Likes: 3
From: Magnolia, TX
When I checked mine awhile ago after the seals started leaking, it was silvery with metal particles. I changed it then until I got a chance to do the seals & bearings a few hundred miles later. It was clear then. I don't care what the manual states, I'm changing mine on every vehicle at about 50k. It only makes sense to get rid of the particles from everything breaking in. That statement was probably written by the same genius that claims that "the transmission does not require maintenance." I found that brilliant statement after I couldn't find my non-existent dipstick.
+1
Inspect the housing and change the fluid (friction modifier) every 50K.
The members on this site have FAR more experience than 10 FORD
engineers.
CMOS
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
they are doing better at making the "life time fluid". but it is still a good idea to drain out the factory fill after about a year (20k miles) to get rid on any filings, contamination, sand casting material, etc. Then change out every 50-60k miles after that. This holds true for the differentials, and the transmission fluid.
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