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.

3.90 or 4.10

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Old 03-05-2007, 04:26 PM
  #1  
grayfox92
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Default 3.90 or 4.10

im planing to do the rearend on my92,What you guy think 3.90 or 4.10 on a five speed. a friend of my has 3.90 on his 89 and he says it feels the same as 3.73
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Old 03-05-2007, 04:27 PM
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88BlueGT
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Default RE: 3.90 or 4.10

The difference between 3.90's and 4.10's is minimal. If your debating 3.90's & 4.10's just go w/ the 4.10's if its a bolt on NA car.
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Old 03-05-2007, 04:27 PM
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LTnone
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Default RE: 3.90 or 4.10

3.73 and 3.90 are almost indistinguishable from each other. Go for the 3.73/90's in a stick, at least if you're going to be on the highway ever
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Old 03-05-2007, 04:28 PM
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r.barn
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Default RE: 3.90 or 4.10

just depends on how much freeway driving you do.
i think my rpms are pretty high on the freeway and i only have 3.55's

I vote 3.90's
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Old 03-05-2007, 04:30 PM
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88BlueGT
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Default RE: 3.90 or 4.10

The RPM difference between 3.90's & 4.10's though is going to be very small. I run about 2,400 at 70mph w/ 3.90's through an AOD.
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Old 03-05-2007, 05:45 PM
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scooterstang
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Default RE: 3.90 or 4.10

im in what seems to be the same situation as you. My 88lx is my daily driver but i love goin fast. The only races my car sees is when the honda next to is reving his engine at the stoplight. I have decided to get 3.90 just because why not save the little extra gas i can, plus i already smoke pretty much anything that rolls up next to me on the street so you don't really need the 4.10 imo
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Old 03-05-2007, 05:59 PM
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johnjr45
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Default RE: 3.90 or 4.10

4.10s
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