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1999-2007 Gas Engines Discussion of the gas engines available in the 1999-2007 Super Duty trucks

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Old 06-09-2009, 04:46 PM   #1 (permalink)
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Question Diff fluids
I'm getting ready to change the fluids in the diffs, I just want to make sure however;
Front: 75/90
Rear: 75/140 +friction modifier

Is this right?
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Old 06-09-2009, 10:28 PM   #2 (permalink)
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Yup that's 100% correct.

Some gear lubes do not require the use of the friction modifer for the L/S, but most do. I just used 75-140w Royal Purple for mine and it did not require the additive.

In either case good luck!
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Old 06-10-2009, 11:47 AM   #3 (permalink)
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All of the 75-140 gear oils I could find were synthetic and didn't need the modifier. Just read the bottles and they will say if they do.... Search the manufacture web sites for more information......
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