What rear end do I have in my 08 4.0? - Mustang Evolution

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Old 03-24-2009, 07:36 PM   #1
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What rear end do I have in my 08 4.0?

I thought it came with the 7.5 but I took it to a shop today and they looked up the numbers on the thing and he said it's the same 8.8inch that comes on the GT, it just doesn't have posi and has a 3.31 gear ratio.

Is this normal? Could he be wrong about the 8.8inch? I'm about to order 3.73 gears and a Trac-Lok for it but I want to make sure that the 31 spline is correct...
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Old 03-24-2009, 09:39 PM   #2
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Re: What rear end do I have in my 08 4.0?

My 07 4.0L has a 3.31, there is a white sticker on the rear of the differental that has 3.31 on it I have never measured it it but the offical ford web site says 07 V6 hAS 3.31 7.5 28 spline rear end . (Googgle it) the GT have a 3.31 8.8" not until you get to The GT500FR do you see 3.73 gears from factory.
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Old 03-24-2009, 09:43 PM   #3
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Re: What rear end do I have in my 08 4.0?

They came from the factory with a 7.5...
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Old 03-24-2009, 10:50 PM   #4
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Re: What rear end do I have in my 08 4.0?

its 7.5 if it is stock
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Old 03-25-2009, 09:06 AM   #5
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Re: What rear end do I have in my 08 4.0?

its a 7.5, if the chunk measures 8.8 angle to angle then its an 8.8, also if its not round more oblong then its an 8.8 vs the 7.5... hard to know what I mean but you can tell by looking at each which is smaller.
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Old 03-25-2009, 12:53 PM   #6
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Re: What rear end do I have in my 08 4.0?

Well, we compared the rear end to that of a GT rear end that was lying around and they looked identical, then the owner called up ford and verified the numbers on the thing and they said it was an 8.8... I bought it brand new from a dealership so it came like this from the factory, I have already bought the gears for it and will be ordering the posi today, I'll just have the guy install it all for me and if it fits, it's an 8.8, if not, I'll trust you guys from now on, lol
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Old 03-27-2009, 06:09 PM   #7
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Re: What rear end do I have in my 08 4.0?

i got my money on it being a 7.5

or ford wanted to get one of those random stories out

VVVVVVVVVVVVVVVVVVVVVVVVVVVV
"i know a guy that got a 8.8 in a 08 V6 with no posi"

pegleg >>> :burnout:
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