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8.8 Rear Diff Fluid Question

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.

8.8 Rear Diff Fluid Question

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Old 05-23-2010, 12:43 PM
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87Stallion
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Default 8.8 Rear Diff Fluid Question

I had to pull my axles to install longer studs. My question is does synthetic diff fluid already have the friction modifier added? And should I use 75-90 or 75-140?
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Old 05-23-2010, 09:01 PM
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mjr46
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75/90, and most do have an additive for limited slip rears, read the back of the bottle, valvoline and Royal purple both do I know
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Old 05-24-2010, 03:38 PM
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87Stallion
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Thanks mjr
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Old 05-24-2010, 08:30 PM
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Jfsram
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I still add the limited slip additive.
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