Front diff question - Ford Powerstroke Diesel Forum
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Old 04-01-2014, 03:19 PM
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Front diff question

I am looking at changing my fluid in the front diff. The manual says 80w-90. Some people say to add friction additive, but I believe that's just for the rear. I found some valvoline 80w-90. It said limited slip on bottle, is that good stuff? What are y'all using. Thanks in advance
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Old 04-01-2014, 04:07 PM
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Friction modifier is used in the Limited Slip differentials. Since no Limited Slip Differential was ever put on the front of a Super Duty from the factory, use 80W90 gear oil. No friction modifier necessary.
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