8.8" Rear Axle Stock on a V6?? - Mustang Evolution

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Old 06-19-2012, 09:21 PM   #1
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8.8" Rear Axle Stock on a V6??

I was wondering if the 8.8" axle with 3.31 gears was availible as an option on the 2008 v6 or pony package? Cause my differential cover matches that of an 8.8"
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Old 06-19-2012, 11:15 PM   #2
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It wasn't a factory option.
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Old 06-20-2012, 11:02 AM   #3
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Quote:
Originally Posted by jamin22786
It wasn't a factory option.
Then why do I have an 8.8" differential cover?
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Old 06-20-2012, 11:05 AM   #4
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Quote:
Originally Posted by 08Mustang

Then why do I have an 8.8" differential cover?

You bought it brand new from the dealership like that?
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Old 06-20-2012, 05:41 PM   #5
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Originally Posted by Torchredmustang

You bought it brand new from the dealership like that?
No, I bought it used from a dealer. But the lady that had it didn't list any mods done to the car
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Old 06-20-2012, 05:46 PM   #6
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Quote:
Originally Posted by 08Mustang

No, I bought it used from a dealer. But the lady that had it didn't list any mods done to the car
Maybe the previous owner got the car used as well?
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Old 06-20-2012, 05:57 PM   #7
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The tag on the diff says 8.8? And 3.31?
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Old 06-20-2012, 08:38 PM   #8
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Quote:
Originally Posted by deadsp0t
The tag on the diff says 8.8? And 3.31?
There's a tag that says 3.31 but no tag saying the size
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Old 06-20-2012, 08:41 PM   #9
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Quote:
Originally Posted by 08Mustang

There's a tag that says 3.31 but no tag saying the size
Traditionally the axel size and gear size are embedded in the code on the tag on older 8.8's The sizes will appear broken up. Isn't there a gear/axel code in the door jam on newer stangs?
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Old 06-20-2012, 10:08 PM   #10
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Quote:
Originally Posted by deadsp0t

Traditionally the axel size and gear size are embedded in the code on the tag on older 8.8's The sizes will appear broken up. Isn't there a gear/axel code in the door jam on newer stangs?
Possibly, not sure. But yeah I'm kinda perplexed right now lol
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Old 06-20-2012, 10:58 PM   #11
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Quote:
Originally Posted by 08Mustang

Possibly, not sure. But yeah I'm kinda perplexed right now lol
So it does actually say 8.8 on it? That's really strange... Only one way to find out if it's real, do a burnout and if both wheels spin then you have it
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Old 06-21-2012, 12:25 AM   #12
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Quote:
Originally Posted by Soccerluvr4

So it does actually say 8.8 on it? That's really strange... Only one way to find out if it's real, do a burnout and if both wheels spin then you have it
That will only tell if it has a limited slip differential. Could have put an aftermarket one on a 7.5 with an aftermarket differential cover? Maybe new gears too? I'd try to find out if you can still contact the previous owner.
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Old 06-21-2012, 06:29 AM   #13
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Quote:
Originally Posted by jamin22786

That will only tell if it has a limited slip differential. Could have put an aftermarket one on a 7.5 with an aftermarket differential cover? Maybe new gears too? I'd try to find out if you can still contact the previous owner.
No it's the factory cover and it wouldn't matter cause the arrangement of the bolts that bolt in the cover match that of an 8.8"
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Old 06-21-2012, 08:22 AM   #14
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Quote:
Originally Posted by 08Mustang

No it's the factory cover and it wouldn't matter cause the arrangement of the bolts that bolt in the cover match that of an 8.8"
Pics.
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Old 06-21-2012, 08:25 AM   #15
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Quote:
Originally Posted by deadsp0t

Traditionally the axel size and gear size are embedded in the code on the tag on older 8.8's The sizes will appear broken up. Isn't there a gear/axel code in the door jam on newer stangs?
I believe you are mistaken.
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Old 06-23-2012, 05:08 PM   #16
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Re: 8.8" Rear Axle Stock on a V6??

No V6 came with an 8.8 from the factory until 2011 model year. The stock gears (in fact the only gears available for the V6) was 3.31 - no other combination of rear end was available from the factory. The bolt pattern is the same as I recall from doing the swap, but it has been so long I can't remember for sure.

If you do have an 8.8 rear end then a prior owner swapped the rear end.
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Old 06-23-2012, 10:56 PM   #17
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Originally Posted by JimC
No V6 came with an 8.8 from the factory until 2011 model year. The stock gears (in fact the only gears available for the V6) was 3.31 - no other combination of rear end was available from the factory. The bolt pattern is the same as I recall from doing the swap, but it has been so long I can't remember for sure.

If you do have an 8.8 rear end then a prior owner swapped the rear end.
Yep I've done some more research and I've got an 7.5", I just figured that the bolt patterns would be different. But anyways, what's the max horsepower to be safely run on a 7.5"?
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Old 06-24-2012, 01:01 AM   #18
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Quote:
Originally Posted by 08Mustang

Yep I've done some more research and I've got an 7.5", I just figured that the bolt patterns would be different. But anyways, what's the max horsepower to be safely run on a 7.5"?
That depends on you tires and gear ratio. What are you running?
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Old 06-24-2012, 01:39 AM   #19
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Seen ppl twist driveshafts in fox body cars w/ 26x10.5 slicks w/ a 7.5. A mild 302 w/ a 200 shot.
Not a recommended set up.
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Old 06-24-2012, 08:23 AM   #20
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Re: 8.8" Rear Axle Stock on a V6??

Quote:
Originally Posted by 08Mustang View Post
Yep I've done some more research and I've got an 7.5", I just figured that the bolt patterns would be different. But anyways, what's the max horsepower to be safely run on a 7.5"?
Quote:
Originally Posted by jamin22786 View Post
That depends on you tires and gear ratio. What are you running?
Didn't take much to break my 7.5 (worst modding decision ever was to try to build a 7.5 - put tlok, 3.73's, and the LPW girdle on it thinking it would be strong enough). All I had was a CAI, tune, and a set of drag radials on the car - around 180 RWHP and about that in torque. Bent the pinion on a set of supposedly indestructible Richmond gears with just that set up.
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Old 06-24-2012, 11:27 AM   #21
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Quote:
Originally Posted by JimC

Didn't take much to break my 7.5 (worst modding decision ever was to try to build a 7.5 - put tlok, 3.73's, and the LPW girdle on it thinking it would be strong enough). All I had was a CAI, tune, and a set of drag radials on the car - around 180 RWHP and about that in torque. Bent the pinion on a set of supposedly indestructible Richmond gears with just that set up.
You only had 180rwhp with a cai and tune??
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Old 06-24-2012, 01:00 PM   #22
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Originally Posted by 08Mustang

You only had 180rwhp with a cai and tune??
Yea I'm gonna have to call you on that too. Dynos show that our cars have 179rwhp STOCK. With a cai and tune you should be near 200
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Old 06-24-2012, 04:09 PM   #23
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Re: 8.8" Rear Axle Stock on a V6??

I have a copy of the dyno sheet as well as a spreadsheet comparing: CAI/tune, nitrous, Xcharger, and then Xcharger Xtreme. But the tuner is known for a very conservative tune; never had a chance to get a dyno number when I went to a more aggressive race tune for 93 octane.

Don't mix up the flywheel numbers with the rear wheel number. Stock after driveline losses from the 210 at the flywheel will only be about 170 at the rear wheels.

My car never put down big numbers on the dyno - but it didn't stop it from running mid-13's on nitrous and mid 12's with the Xcharger Xtreme
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