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Old 07-06-2010, 06:15 AM
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Differential fluids 2006 f-250

I changed the diff fluids in both front and rear. After filling the rear I noticed I put the fluid for the front in the rear. (80w-90 royal purple). I had to put the 75w 140 in the front. ANY possible with the diffs if I don't change the rear over?
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Old 07-06-2010, 07:49 AM
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If i understand what you are asking the question is do you need to change the fluid in your diffs a second time to prevent problems. This is my two cents, if ford calls for a specific oil in the rear as well as the front i would go with that. Accidents happen but it is better to correct those accidents rather than deal with the potential problems they may bring forth.
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Old 07-06-2010, 09:46 AM
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The front is not an issue.

IMO, if you are NOT going to be towing, the rear is fine. If you will be towing, just change it out before you start your trip.
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Old 07-06-2010, 04:39 PM
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If you do a lot of 4X4ing change the front to 75w90, but the rear must always be 75w140, always.
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Old 07-07-2010, 08:29 AM
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If this is your daily driver then your rear diff will not be needing the 140. Yet I do recommend switching them.


To get the most fluid out here is what I would do. Draining the front, Park your truck with the rear wheels higher than the front. Draining the back, Park your truck with the front wheels higher than the rear. Just let the truck sit for a few hours and you will have most of your fluid back.
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