5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

REAR DIFF FLUIDS

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Old Oct 22, 2008 | 09:13 AM
  #1  
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stang1992
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Default REAR DIFF FLUIDS

I HAVE A 1992 5.0 AND I INSTALLED ROYAL PURPLE IN THE REAREND DO I STILL NEED TO USE FRICTION MODIFYER????
Old Oct 22, 2008 | 10:09 AM
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i think just some posi additive and your good
Old Oct 22, 2008 | 11:39 AM
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I would still add the Ford fricton modifer...can't hurt!
Old Oct 22, 2008 | 01:17 PM
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I thought you werent supposed to overdue it with the FM. Anyway, RP has it in there already and they do not recommend adding anything else... read the bottle.
Old Oct 22, 2008 | 05:33 PM
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now when i burn out around a corner i can feel when the rear end isnt hitting posi it comes in and out is that cause of the lack of modifier?????? or a tired rear end. car has 107,000 miles
Old Oct 22, 2008 | 05:45 PM
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my bet is on a worn out trac loc
Old Oct 22, 2008 | 06:53 PM
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No, the friction modifier is already in the Royal Purple.
Old Oct 22, 2008 | 07:47 PM
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Originally Posted by Mustangdemon67
i think just some posi additive and your good
that is what friction modifier is
Old Oct 22, 2008 | 07:49 PM
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Stang1992, that sounds like limited slip.
Old Oct 22, 2008 | 08:03 PM
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Originally Posted by stang1992
now when i burn out around a corner i can feel when the rear end isnt hitting posi it comes in and out is that cause of the lack of modifier?????? or a tired rear end. car has 107,000 miles
Its not supposed to.. Its a posi aka limited slip like Explosive said. Its supposed to give some turning radius help by allowing one wheel to spin faster than the other. If it was a spoll then it would burn out while going around a corner but with a posi/limited slip it will only burn out with one tire around a corner like that.



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