Rear diff oil additive ? - Ford Powerstroke Diesel Forum
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Old 03-16-2010, 05:03 PM
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Rear diff oil additive ?

Hopefully this weekend I will be regearing my truck, I was thinking that I would use Amsoil 75-140 extreme gear full synthetic oil in the rear. My truck has the stock limited slip so do I need to add the friction modifier if I use this synthetic oil? Whats your thoughts?

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Old 03-16-2010, 06:35 PM
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I used royal purple duferential oil, and it has the friction modifier within the oil already.
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Old 03-16-2010, 06:57 PM
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The spec sheet on the web site doesnt say that it does, nor does it say it doesnt. For some reason I am quite sure it does though. Not much help but maybe the bump will get someone for you that does know for certain.
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Old 03-16-2010, 07:13 PM
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Put the Amsoil in. If it chatters on turning add the friction modifier.
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Old 03-17-2010, 08:42 AM
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Cool deal guys thanks for the replies! But if anyone knows for sure please let me know.

Thanks
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Old 03-17-2010, 08:57 AM
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AMSOIL SEVERE GEAR is compatible with most but not all limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.
I have the Amsoil sever gear in my rig but as an added precaution I did add the modifier. It's only 10 bucks.
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