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Discussion Starter #1
I know my 2004 GT has 28 spline axles from the factory.

I have a set of rear 8.8 axles from a 2010 crown Victoria at work. Does anyone know if they are 31 spline and could they be installed in my Mustang? They were ordered for the local police department but they sold the car before they were used.

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You can count the splines on the end of the axle shaft to determine if is a 28 or 31.

I suspect that the rear end on a Vic is wider, so it likely has longer axle shafts.
 

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IIRC the length is different. Why do you need 31 splines btw?
 

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Discussion Starter #4
If the axles were to fit (which I'm pretty sure they aren't now due to length different) I was going to upgrade axles with a different limited slip. But now I'm just going to keep my stock axles. I ordered the Ford Racing rebuild kit for my factory limited slip. Gears and rebuild should be done next month I hope.

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