S/C Thunderbird 8.8 Rear end into a 2003 Mustang V6 ? - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 19 Old 12-03-2007, 10:32 AM Thread Starter
 
Trader Feedback: (0)
Join Date: Dec 2005
Posts: 12
S/C Thunderbird 8.8 Rear end into a 2003 Mustang V6 ?

ive got some rear end issues and ive got a buddy with a 8.8 rear end from a thunderbird s/c car and i was wondering if i could use that rear end ? .. and what mods i would need to get it to work right
Thanks, Matt

xXcoolrollinXx is offline  
Sponsored Links
Advertisement
 
post #2 of 19 Old 12-03-2007, 11:06 AM
Registered User
 
FineLineMtrSprts's Avatar
 
Trader Feedback: (3)
Join Date: May 2004
Location: Inwood,West Va
Posts: 2,418
Thunderbird SC..ie Super Coupes have IRS..not solid axle..and it is NOT a bolt in deal into a mustang...totally different chassis. If you want IRS you have to get it out of a 03/04 cobra..and yes it is basically bolt in. If you are just trying to get an 8.8 solid rear you want one of of a TURBO COUPE thunderbird..not a SC.


2003 Tahoe modded..louder..lower
2012 Toyota 4Runner Trail Edition lifted and louder
FineLineMtrSprts is offline  
post #3 of 19 Old 12-03-2007, 11:43 AM
Authorized corral.net Advertiser
 
Trader Feedback: (2)
Join Date: Oct 2002
Location: Ontario, NY 14519
Posts: 145
Like said before the Supercoupe has a IRS setup. The T-Bird SC is on a MN-12 chassis which is different than you mustang and will not bolt in.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Contact Us:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


High volume STOCKING dealer for:
Roush Performance, Ford Racing Parts, Steeda, Maximum Motorsports, Canton, Dart(Blocks & Heads), SCAT, World Products, Edelbrock, Comp Cams, Crane, ARP, Manley, Moroso, Fel-Pro Gaskets, Clevite Bearings, Diamond Pistons, Superchips, Spec Clutch, Ram Clutch and more!!!
Northcoast Perf is offline  
Sponsored Links
Advertisement
 
post #4 of 19 Old 12-04-2007, 08:54 AM Thread Starter
 
Trader Feedback: (0)
Join Date: Dec 2005
Posts: 12
well i was told that a locker would fix my problem with my 7.5 rear end ... i ordered a Powertrax Locker .. but im not sure if that was a good idea ?
xXcoolrollinXx is offline  
post #5 of 19 Old 12-04-2007, 10:00 AM
Registered User
 
FineLineMtrSprts's Avatar
 
Trader Feedback: (3)
Join Date: May 2004
Location: Inwood,West Va
Posts: 2,418
The problem with the 7.5 rear is that....well its a 7.5in rear end..just not very strong. How much power are you going to be putting to it?

2003 Tahoe modded..louder..lower
2012 Toyota 4Runner Trail Edition lifted and louder
FineLineMtrSprts is offline  
post #6 of 19 Old 02-09-2008, 09:16 PM
Registered User
 
Trader Feedback: (9)
Join Date: Aug 2000
Location: Southern NJ
Posts: 3,486
If you paid more than $200 for that Powertrax you could have spent that much on an 8.8 that would have had a Traction Lock and added strength of larger ring and pinion as well as larger differential internals.
Modifying a 7.5 is like polishing a turd.
gnvair is offline  
post #7 of 19 Old 02-12-2008, 12:00 AM
Registered User
 
Trader Feedback: (0)
Join Date: Jan 2000
Location: Santa Ana, CA
Posts: 93
I had a 1999 V6 with an 8.8" that Ford bought and installed for me under a service bulletin. There was nothing unsafe about the 7.5, just had a gear whine. I think I was 1 of 180 cars to get the 8.8". My car was also in the factory in Feb 99 when it exploded and shut the line down for a day or so. I found stray parts in the car from where the workers left off what they were doing.

Conversely, never had a failure of anything on that car. Not even the battery. Same battery for 8 years and 127K miles. I had to scrap the car when the #3 cylinder rings went bad and burned 1 quart in 100 miles.

I heard about it a few weeks ago, its now driven by some mexican. The car like all of ours, are unmistakeable on the road.

Ok, no more lame story-- go get yourself a used 99-04 GT 8.8" and it bolts right in, even the quad shoks if you want them, I never used quad's on the 99.
Factory price in 99 for a new 8.8 was $1200.

You forgot about the ramdom gun fire in the streets, RPG's, and the cackle of Klashnikovs on all the major holidays.

LA rules! I love this place.
35thPONY is offline  
post #8 of 19 Old 02-13-2008, 01:58 PM
Registered User
 
Trader Feedback: (0)
Join Date: Sep 2006
Location: ludlow mass
Posts: 165
Quote:
Originally Posted by gnvair View Post
If you paid more than $200 for that Powertrax you could have spent that much on an 8.8 that would have had a Traction Lock and added strength of larger ring and pinion as well as larger differential internals.
Modifying a 7.5 is like polishing a turd.
built 7.5 > stock 8.8

8.8s arent even that strong i have blown them up on stock mach 1 power

99 mustang gt 35th vert - bolt ons
09 f-350 lariat CCSB 5.4 - DD
04 f-350 RCLB 6.0 - sold
---8100 lbs 13.9 @ 96 tune/deleted, stock heads
mustangman022232 is offline  
post #9 of 19 Old 02-13-2008, 06:52 PM
Registered User
 
Trader Feedback: (9)
Join Date: Aug 2000
Location: Southern NJ
Posts: 3,486
Quote:
Originally Posted by mustangman022232 View Post
built 7.5 > stock 8.8

8.8s arent even that strong i have blown them up on stock mach 1 power
7.5's usually break teeth of the ring and pinion sets or they grenade the carriers. Never seen an 8.8 break a ring and pinion set (that was set up correctly) and they hardly ever break the carrier. Most 8.8 failures in a Mustang are as a result of a broken axle.
I dont doubt your Mach 1 breaking as I have probably built atleast a half dozen 99-04 8.8's on GT's and Mach 1. All have broken the left side axle. All were basically stock cars being launched on sticky tires.
Axle shafts are the same between the V6 7.5 and the V8 8.8. But you will probably never see a 7.5 break and axle because the carrier or the ring and pinion fail before the axle since those items are the weak spots.
But seriously the reason why I stated 7.5's are junk are because with the small ring gear comes a smaller carrier and smaller spider gears and side gears. Ask any one that owned and raced an 82-85 GT (which came stock with 7.5's. Usually the spider or side gears failed.
I had one friend with an 84 GT who's 7.5 blew up driving over a bump. Driveline basics apply: a larger ring and pinion is able to handle more torque. If this wasnt the case, Ford would still be using the 8.8 behind all the V8 Mustang power plants. They stopped using the 7.5's because of all the warranty claims from blown up 7.5's. Heck, even the V6 Rangers and all of the Explorers came with an 8.8 because the 7.5 was deemed too fragile.

Last edited by gnvair; 02-13-2008 at 06:57 PM.
gnvair is offline  
post #10 of 19 Old 02-14-2008, 01:16 PM
Registered User
 
FineLineMtrSprts's Avatar
 
Trader Feedback: (3)
Join Date: May 2004
Location: Inwood,West Va
Posts: 2,418
Quote:
Originally Posted by mustangman022232 View Post
built 7.5 > stock 8.8

8.8s arent even that strong i have blown them up on stock mach 1 power
Of course building a 7.5 is useless since a 8.8 with the same money thrown at it would still be stronger. WAY STRONGER


2003 Tahoe modded..louder..lower
2012 Toyota 4Runner Trail Edition lifted and louder
FineLineMtrSprts is offline  
post #11 of 19 Old 02-15-2008, 10:24 PM
Registered User
 
Trader Feedback: (0)
Join Date: Jan 2000
Location: Santa Ana, CA
Posts: 93
<---- goes to drink punch in the corner and watch silently as the only one in the room who had a 99-04 V6 with an 8.8" with 100,000+ miles on that combo.

You forgot about the ramdom gun fire in the streets, RPG's, and the cackle of Klashnikovs on all the major holidays.

LA rules! I love this place.
35thPONY is offline  
post #12 of 19 Old 02-16-2008, 01:47 PM
Registered User
 
FineLineMtrSprts's Avatar
 
Trader Feedback: (3)
Join Date: May 2004
Location: Inwood,West Va
Posts: 2,418
Not uncommon to see a 8.8 with over 100k miles

2003 Tahoe modded..louder..lower
2012 Toyota 4Runner Trail Edition lifted and louder
FineLineMtrSprts is offline  
post #13 of 19 Old 02-18-2008, 02:19 PM
Registered User
 
Trader Feedback: (0)
Join Date: Sep 2006
Location: ludlow mass
Posts: 165
i have never seen a R&P blow out of a 7.5, 99.9% of the time its the spider gears that blow out on them (hell my stock open blew up on a stock car), and like i said i blew the spiders out of my buddies mach with sticky tires on it as well and a hard clutch drop

there are several 6ers running a 7.5 with either an eaton or detroit true trac LSD in it that are having no problems with 400+ HP, its the ford parts that blow up

99 mustang gt 35th vert - bolt ons
09 f-350 lariat CCSB 5.4 - DD
04 f-350 RCLB 6.0 - sold
---8100 lbs 13.9 @ 96 tune/deleted, stock heads
mustangman022232 is offline  
post #14 of 19 Old 02-18-2008, 03:58 PM
 
Trader Feedback: (0)
Join Date: Jan 2005
Posts: 84
Quote:
Originally Posted by gnvair View Post
If you paid more than $200 for that Powertrax you could have spent that much on an 8.8 that would have had a Traction Lock and added strength of larger ring and pinion as well as larger differential internals.
Where? Junkyard? I'd like to find one but not something I don't know where it's been.

I have a stock 7.5" with 3:73s and am putting down a little over 400rwhp. I recently heard that the supercoupes came with a 8.8" with 3:73s from the factory. A guy on our forum says he got one for $200 and installed himself. For $200 and the gearing I want, that might be worth taking the chance. I just have to make sure I'm looking for the right thing.
tealpony is offline  
post #15 of 19 Old 02-18-2008, 04:20 PM
Registered User
 
Trader Feedback: (9)
Join Date: Aug 2000
Location: Southern NJ
Posts: 3,486
Quote:
Originally Posted by mustangman022232 View Post
i have never seen a R&P blow out of a 7.5, 99.9% of the time its the spider gears that blow out on them (hell my stock open blew up on a stock car), and like i said i blew the spiders out of my buddies mach with sticky tires on it as well and a hard clutch drop

there are several 6ers running a 7.5 with either an eaton or detroit true trac LSD in it that are having no problems with 400+ HP, its the ford parts that blow up
You cant polish a turd dude. Compare the spiders and side gears in ANY 7.5 to even a stock 8.8. They are a lot smaller. Get real and get an 8.8. Putting any money into a 7.5 is like throwing it out the window. No matter what you do to it, it will still be a 7.5.
Adding a detroit or an Eaton to a 7.5 is like putting new wipers on a broken windshield.

Last edited by gnvair; 02-18-2008 at 04:24 PM.
gnvair is offline  
post #16 of 19 Old 02-18-2008, 04:30 PM
Registered User
 
Trader Feedback: (9)
Join Date: Aug 2000
Location: Southern NJ
Posts: 3,486
Quote:
Originally Posted by tealpony View Post
Where? Junkyard? I'd like to find one but not something I don't know where it's been.

I have a stock 7.5" with 3:73s and am putting down a little over 400rwhp. I recently heard that the supercoupes came with a 8.8" with 3:73s from the factory. A guy on our forum says he got one for $200 and installed himself. For $200 and the gearing I want, that might be worth taking the chance. I just have to make sure I'm looking for the right thing.
You can use any 86-98 8.8 by swapping your axles and brakes on to it.
I have done this swap into several SN95 cars and you need to drill 2 holes in the lower control arm brackets to screw the brake lines on IF you use an 86-93 rear). 94-98 8.8's will already have those holes.
You can also use an 87-88 TBird Turbo Coupe housing by doing the same. The auto turbo coupes had 3.73's and the 5 speeds had 3.55's.
TBird Super coupes are independent like the 99-04 Cobras.
The guy on the forum probably used a Turbo Coupe rear.
gnvair is offline  
post #17 of 19 Old 02-20-2008, 06:18 PM
Registered User
 
Trader Feedback: (0)
Join Date: Sep 2006
Location: ludlow mass
Posts: 165
Quote:
Originally Posted by gnvair View Post
You cant polish a turd dude. Compare the spiders and side gears in ANY 7.5 to even a stock 8.8. They are a lot smaller. Get real and get an 8.8. Putting any money into a 7.5 is like throwing it out the window. No matter what you do to it, it will still be a 7.5.
Adding a detroit or an Eaton to a 7.5 is like putting new wipers on a broken windshield.
so why even bother with an 8.8 and why not just go 9"?

99 mustang gt 35th vert - bolt ons
09 f-350 lariat CCSB 5.4 - DD
04 f-350 RCLB 6.0 - sold
---8100 lbs 13.9 @ 96 tune/deleted, stock heads
mustangman022232 is offline  
post #18 of 19 Old 02-20-2008, 08:02 PM
Registered User
 
Trader Feedback: (9)
Join Date: Aug 2000
Location: Southern NJ
Posts: 3,486
Quote:
Originally Posted by mustangman022232 View Post
so why even bother with an 8.8 and why not just go 9"?
Because the 8.8 is a more efficient rear powerwise and significantly lighter.
A 9" with its straddlemounted pinion tends to suck up 2-3% more power than a comparable over hung style pinion used in most integral style rears.
Dimensionally, the Ford 8.8 is almost identical to the 65-72 Chevrolet passenger car 12 bolt (ring & pinion sizing, bearing sizing, pinion stem diameter, etc). The down side was that Ford equipt most passenger car 8.8 rears with the same 28 spline axle shafts that were used in the 7.5 where as the Chevrolet 12 bolts came standard with 30 spline shafts. Ford most likely did this as a cost savings since the first 8.8's were used on the fullsize cars (Crown Vics, Town Cars, Grand Marquis) which came with 7.5's from 79 until the 8.8 was introduced. Ford basically kept everything the same from the axle tubes outwards. They did the same thing in 1986 with the 5.0 Mustangs.
I know you had mentioned breaking carriers, but if you have never compared a 28 spline 8.8 carrier to a 31 spline carrier, you will see a significant difference in the size on the 31 spline units. The cross shaft and gears are physically bigger. Thats not to say a 31 spline wont break, but then again, you can break ANY carrier with enough torque and shock. I know plenty of people (including myself) who have blown up Auburn Pro's and Eaton's.
I know quite a few guys who have been in the 8's with 8.8's and if you talk to many guys on here and at the track you will find the samething.
gnvair is offline  
post #19 of 19 Old 02-21-2008, 04:26 PM
Registered User
 
FineLineMtrSprts's Avatar
 
Trader Feedback: (3)
Join Date: May 2004
Location: Inwood,West Va
Posts: 2,418
9in is also more expensive..thats one reason a lot of guys stick with the 8.8. Also you can mod a 8.8 to be pretty much just as strong as a 9in,using 9in axle tubes and 33spline axles. Of course guys running those are making serious POWER.

2003 Tahoe modded..louder..lower
2012 Toyota 4Runner Trail Edition lifted and louder
FineLineMtrSprts is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome