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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 11-21-2008, 10:32 PM   #1
sIx
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Default 8.8 questions

So... after a racing incident today, I've decided that my open differential is crap... I want to do an 8.8" and am wondering a few things... 28 or 31 spline axles? and how hard is swapping my 7.5" out for an 8.8?

Thanks for any help...
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Old 11-21-2008, 10:35 PM   #2
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8.8 is a direct swap if it's from your same body style. On a new edge, the SN95 8.8 losses a 1/2" (correct?) and SN95 with new edge 8.8 gains 1/2".

As far as axles... I need to research more on that one.
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Old 11-21-2008, 10:39 PM   #3
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Ok, I have no idea about axles...I raced a '94 GT 3 lightpoles, and he won, but I spun ONE TIRE some ways, then shifted a lil to early...and I think that if I wasn't spinning, I MIGHT have had him...
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Old 11-21-2008, 11:30 PM   #4
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So...anyone with any ideas on 28 or 31 spline axles? I'm guessing 31 spline is better? what is in a stock GT? 28 spline?
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Old 11-21-2008, 11:50 PM   #5
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if you can find an 8.8 for $200 or under then it's worth it. other than that the detroit truetrac in a 7.5 is stronger than a stock 8.8.

all 94-04 v6/GT stangs have 28 spline axles regardless of 7.5 or 8.8 they are exactly the same axle according to year. 94-98 are the same length and 99-04 are the same length axle. 94-98 axles are shorter than 99-04
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Old 11-22-2008, 12:38 AM   #6
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What would need to be done to get this to fit? I think its off a '93

http://cgi.ebay.com/ebaymotors/Ford-...Q5fAccessories
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Old 11-22-2008, 07:31 AM   #7
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Quote:
Originally Posted by sIx View Post
What would need to be done to get this to fit? I think its off a '93

http://cgi.ebay.com/ebaymotors/Ford-...Q5fAccessories
you can't just buy an 8.8 differential and try to put it in your rear. your rear is a 7.5. you would need the entire complete 8.8 rear from end to end. that differential won't fit in the rear that's on your car

anyways i wouldn't pay 10 cents for an 8.8 track lok used from 1993.

this is what you need. this place is $100 less than anyother place on the truetrac
http://cgi.ebay.com/ebaymotors/DETRO...4506.m20.l1116

you would also need an install kit for about $80 which containes all the shims and bearings and seals/gaskets needed for the install. install price by a tranny shop is generally around $250.

sorry you not gonna get away with doing the rear for under $500 to get a limited slip differential
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Old 11-22-2008, 09:27 AM   #8
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So the 7.5 with a truetrac would be strong enough to handle a built and blown motor? (not to hijack or anything, but if it is then that is way easier than trying to find a cheap 8.8, in my opinion)
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Old 11-22-2008, 12:30 PM   #9
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So the 7.5 with a truetrac would be strong enough to handle a built and blown motor? (not to hijack or anything, but if it is then that is way easier than trying to find a cheap 8.8, in my opinion)
i'm running the truetrac in the 7.5 with my procharger.

truetrac in the 7.5 is good for a 450rwhp car. add in a girdle and bearing cap stud kit and hardened 28 spline axles for extra strength and the 7.5 will handle 99% of v6er's out there.

i will be at about 450rwhp by spring and i have no worries whatsoever except my stock axles
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Old 11-22-2008, 12:51 PM   #10
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Quote:
Originally Posted by cobra232 View Post

this is what you need. this place is $100 less than anyother place on the truetrac
http://cgi.ebay.com/ebaymotors/DETRO...4506.m20.l1116
booo they went up in price since i baught mine. i paid $380 from them for mine, why the hell did i resell it now :banghead:
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Old 11-22-2008, 12:51 PM
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