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Old 09-23-2007, 03:52 AM   #1
contrail1
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Default Difference between 28 and 31 Spline Differential

I have a 94 Mustang GT Conv. What's the difference between the 28 and 31 Spline Differentials? I'm looking to have some drive train work done. Installing limited slip differential, new clutches and 3.73gears. I'm hearing grinding noise in the rear end when I come off the clutch and I have 20" rims on her. I read it was better to replace stock the gears anddifferential. If anyone has recommendations, please share. One more question, are the stock gears 8.8"?
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Old 09-23-2007, 03:58 AM   #2
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Default RE: Difference between 28 and 31 Spline Differential

8.8 is the size of your rear end. stock gears are 3:27
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Old 09-23-2007, 04:30 AM   #3
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Default RE: Difference between 28 and 31 Spline Differential

Thanks bro...
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Old 09-23-2007, 02:38 PM   #4
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Default RE: Difference between 28 and 31 Spline Differential

31 spline axles are stronger than 28 spline and you need a 31 spline diff to run the axles. I went with the '03 Cobra diff and moser axles for my setup, so far so good.
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Old 09-23-2007, 03:11 PM   #5
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Default RE: Difference between 28 and 31 Spline Differential

If you stay with 28 you can use the stock axles and dif just put new clutchs in it. If you go 31 you got to buy a new dif and axles.
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Old 09-23-2007, 07:52 PM   #6
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Default RE: Difference between 28 and 31 Spline Differential

Actually I'm fairly certain that the '94s onlycame with either 2.73s or 3.08s. For manual at least, I'm not too sure on autos. Feel free to correct me if I'm wrong though.
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Old 09-23-2007, 08:41 PM   #7
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Default RE: Difference between 28 and 31 Spline Differential

do they not make upgraded strenght 28's?
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Old 09-23-2007, 08:55 PM   #8
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Default RE: Difference between 28 and 31 Spline Differential

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8.8 is the size of your rear end. stock gears are 3:27
The GTs were 3.08 and I think 2.73 gears. Cobras were 3.27s
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Old 09-23-2007, 11:01 PM   #9
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Default RE: Difference between 28 and 31 Spline Differential

Cobras only had 3.08s that year also.
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Old 09-23-2007, 11:51 PM   #10
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Default RE: Difference between 28 and 31 Spline Differential

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8.8 is the size of your rear end. stock gears are 3:27
The GTs were 3.08 and I think 2.73 gears. Cobras were 3.27s
depends on the year, though.
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