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.

Rearend Upgrade/Rebuild

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Old 04-14-2006, 12:31 PM
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stanglx2002
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Default Rearend Upgrade/Rebuild

The posi in my rearend is shot bc it only spins the passenger side tire and when I give the car throttle in its power range it pulls to the right like the only tire pulling is the right tire. i want to know what I should do just rebuild the rearend and posi or upgrade? I was looking at Eaton and Auburn diffs but I dont know the difference if any.
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Old 04-14-2006, 12:37 PM
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meiguoren33
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Default RE: Rearend Upgrade/Rebuild

Did u try adding more FM?
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Old 04-14-2006, 12:37 PM
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stanglx2002
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Default RE: Rearend Upgrade/Rebuild

what is FM
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Old 04-14-2006, 12:39 PM
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meiguoren33
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Default RE: Rearend Upgrade/Rebuild

friction modifier
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Old 04-14-2006, 01:08 PM
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stanglx2002
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Default RE: Rearend Upgrade/Rebuild

no
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Old 04-14-2006, 01:46 PM
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meiguoren33
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Default RE: Rearend Upgrade/Rebuild

Friction modifier is the factory additive for trac loc or posi's. It costs about $5 for a four ounce bottle. Also, is your fluid level high enough. Back of the diff, 3/8" square socket drive for the fill plug.
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Old 04-14-2006, 02:26 PM
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OnyxCobra
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Default RE: Rearend Upgrade/Rebuild

well i dont know if you have gears or not but if you dont now would be a good time to add them. If you ever want to do hard launches with slicks or drag radials it might make sense to upgrade to a 31 spline rear end. Auburn and Eaton both make great diffs... as does Moser and strange make good axles. I have seen though that some strange axles dont work with the factory ABS.
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Old 04-14-2006, 02:45 PM
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Tims 88GT
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Default RE: Rearend Upgrade/Rebuild

check and make sure your rear brakes are adjusted right been there before haha.
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Old 04-14-2006, 03:34 PM
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93BlackNotch
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Default RE: Rearend Upgrade/Rebuild

Get a F150 Trac loc, 31 spline axles, and a set of gears... I know alot of people going deep into the 10's with this set up....
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Old 04-14-2006, 04:13 PM
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HACKGT350
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Default RE: Rearend Upgrade/Rebuild

f150 rear ends fit 5.0's?
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