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06-19-2012, 08:21 PM
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#1 | | Registered User
Join Date: Feb 2012
Posts: 975
| 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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06-19-2012, 10:15 PM
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#2 | | Registered User
Join Date: Feb 2012
Posts: 289
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It wasn't a factory option.
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06-20-2012, 10:02 AM
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#3 | | Registered User
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Posts: 975
| 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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06-20-2012, 10:05 AM
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#4 | | Registered User
Join Date: Dec 2010
Posts: 1,322
| Quote: |
Originally Posted by 08Mustang
Then why do I have an 8.8" differential cover?
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You bought it brand new from the dealership like that?
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06-20-2012, 04:41 PM
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#5 | | Registered User
Join Date: Feb 2012
Posts: 975
| Quote: |
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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06-20-2012, 04:46 PM
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#6 | | Registered User
Join Date: Dec 2010
Posts: 1,322
| 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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06-20-2012, 04:57 PM
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#7 | | Moderator Emeritus
Join Date: Aug 2011
Posts: 4,767
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The tag on the diff says 8.8? And 3.31?
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06-20-2012, 07:38 PM
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#8 | | Registered User
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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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06-20-2012, 07:41 PM
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#9 | | Moderator Emeritus
Join Date: Aug 2011
Posts: 4,767
| 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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06-20-2012, 09:08 PM
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#10 | | Registered User
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Posts: 975
| 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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06-20-2012, 09:58 PM
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#11 | | Evolution's Finest
Join Date: Feb 2012
Posts: 3,211
| 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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Mods: MGW Shifter, BAMA 91 Hybrid tune, K&N Intake, Mac O/R Prochamber
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06-20-2012, 11:25 PM
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#12 | | Registered User
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Posts: 289
| 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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06-21-2012, 05:29 AM
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#13 | | Registered User
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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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06-21-2012, 07:22 AM
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#14 | | Moderator Emeritus
Join Date: Aug 2011
Posts: 4,767
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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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06-21-2012, 07:25 AM
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#15 | | Moderator Emeritus
Join Date: Aug 2011
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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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06-23-2012, 04:08 PM
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#16 | | Registered User
Join Date: Dec 2011
Posts: 590
| 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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06-23-2012, 09:56 PM
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#17 | | Registered User
Join Date: Feb 2012
Posts: 975
| Quote: |
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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06-24-2012, 12:01 AM
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#18 | | Registered User
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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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06-24-2012, 12:39 AM
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#19 | | Moderator Emeritus
Join Date: Aug 2011
Posts: 4,767
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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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06-24-2012, 07:23 AM
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#20 | | Registered User
Join Date: Dec 2011
Posts: 590
| Re: 8.8" Rear Axle Stock on a V6??
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"? | Quote:
Originally Posted by jamin22786 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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06-24-2012, 10:27 AM
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#21 | | Registered User
Join Date: Feb 2012
Posts: 975
| 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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06-24-2012, 12:00 PM
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#22 | | Registered User
Join Date: Feb 2012
Posts: 252
| Quote: |
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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06-24-2012, 03:09 PM
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#23 | | Registered User
Join Date: Dec 2011
Posts: 590
| 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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