MN-12 to SN-95 Bolt Circle Change/Rear - TCCoA Forums
 
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post #1 of 23 (permalink) Old 08-10-2011, 06:17 AM Thread Starter
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MN-12 to SN-95 Bolt Circle Change/Rear

I spent some time yesterday looking into the MN-12 to SN-95 Bolt Circle Change for my 94 TB LX 4.6 and found out the front are no problem but not to much on the rear.I have drums back there and wondering if anyone can lead me to the right direction on how to do the swap in the rear?I have been searching for wheels for a while and finally found the style I wanted for my TB.The wheels are 18x9 and need a little TLC,but worth it for what I got them for.I am hoping there isnt going to be a problem with the rear swap.If so they will be up for sale

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post #2 of 23 (permalink) Old 08-10-2011, 08:09 AM
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Those look like they need alot of work. I hope you got them real cheap

Will

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post #3 of 23 (permalink) Old 08-10-2011, 08:34 AM
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rears swap

Hello

Since you are getting 18's you can find a set of Cobra rear hubs & rotors
Plus a set of fasted's relocation brackets.

You will also need rear disc spindles, calipers & liners.

I purchased a 95 rear K complete. Needed the pumpkin.
I later added the rear discs.

Sent out my rear hubs to: irsmachining.com
redrilled A set of T-bird rear rotors. All stock parts.
All fit under 15" wheels. (I must run 15" steels.)



Paul [email protected]
1990 Thunderbird Circle Track Street Stock
351W 2bbl.
C-4 Auto
3.90 open rear
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post #4 of 23 (permalink) Old 08-10-2011, 09:22 AM Thread Starter
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Quote:
Originally Posted by Roadrunnner View Post
Those look like they need alot of work. I hope you got them real cheap
I got all 4 for 175.00 and getting them blasted for 100.00,I think it a good deal for 18's.
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post #5 of 23 (permalink) Old 08-10-2011, 04:56 PM
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The rear is not cheap by no means. And you want to convert to disc right?

You have to get the IRS spindle from the 99-04 Cobra Mustang to get the bolt pattern and then you have to have the cobra hub pressed out and the Tbird hub pressed in. Then you have to re-drill your Tbird rotors to the SN95 bolt patteren.

It cost me around $500 to do the swap.

Use the tech info in TCCOA to get the parts and instruction you will need.

I have pics in my photobucket on the swap. also added PBR front calipers to. :-)

OH Good Luck.
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post #6 of 23 (permalink) Old 08-10-2011, 07:50 PM
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91bluecoupe...are you using Cobra spindles?

Scars...you need a T-Bird disc brake spindle with a Cobra hub.

-Joe-
1994 Ford Thunderbird SC 5-Speed
1996 Ford Mustang SVT Cobra #1251

Last edited by davis97xr7; 08-10-2011 at 07:58 PM.
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post #7 of 23 (permalink) Old 08-10-2011, 09:42 PM Thread Starter
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I am thinking of going to junk yard and getting what I can from a TB or Couger,what year am I looking for?Is it 95 and up?The junk yards here have alot of TB's and Cougars and a few Stangs.Would it be best to buy it all new?just trying to save a few dollars for the Jmod also.Thanks for the good info,I like the challenge just dont like the cost of course.
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post #8 of 23 (permalink) Old 08-10-2011, 10:45 PM
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I know for sure 94+...spindles you can go used, hubs you can go used from a 99+ Cobra but go with new bearings.

-Joe-
1994 Ford Thunderbird SC 5-Speed
1996 Ford Mustang SVT Cobra #1251
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post #9 of 23 (permalink) Old 08-10-2011, 10:58 PM
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Quote:
Originally Posted by 91bluecoupe View Post
You have to get the IRS spindle from the 99-04 Cobra Mustang to get the bolt pattern and then you have to have the cobra hub pressed out and the Tbird hub pressed in. Then you have to re-drill your Tbird rotors to the SN95 bolt patteren.
Impossible, the Cobra rear uprights (knuckles, spindles) will not fit a Thunderbird IRS. Likely that you just didn't explain it very well. All you need to get from a '99-'04 Cobra are the hubs.

Quote:
Originally Posted by davis97xr7 View Post
Scars...you need a T-Bird disc brake spindle with a Cobra hub.
Correct.

Here's a link to the article I wrote on the subject.

http://home.comcast.net/~dlfraleigh/Article.html

98 Toreador Red Mark VIII LSC - 13.221 @ 104.91
95 Pearl White Thunderbird SC 5spd - 12.879 @ 106.66
98 Laser Red/Black Cobra Coupe (T-56/IRS) - 12.483 @ 110.94
My Web Site
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post #10 of 23 (permalink) Old 08-11-2011, 12:19 AM
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Quote:
Originally Posted by Scars View Post
I am thinking of going to junk yard and getting what I can from a TB or Couger,what year am I looking for?Is it 95 and up?The junk yards here have alot of TB's and Cougars and a few Stangs.Would it be best to buy it all new?just trying to save a few dollars for the Jmod also.Thanks for the good info,I like the challenge just dont like the cost of course.
Doing it over I would say just look for a MK8. It's somewhat late now to research for you what year and....! May someone jumps in on it or you just shoot a PM to DD for some help and hope he's not to busy and has time to help. The info is here somewhere why the MK8 Axles. From a U-Pick its not so much $$ to get the Axle and knuckle setup. Having those parts it's up to you what to do. You could get new Hub's and some cheapo Mustang rotors off ebay.

Quote:
Originally Posted by DLF View Post
Impossible, the Cobra rear uprights (knuckles, spindles) will not fit a Thunderbird IRS. Likely that you just didn't explain it very well. All you need to get from a '99-'04 Cobra are the hubs.


Correct.

Here's a link to the article I wrote on the subject.

http://home.comcast.net/~dlfraleigh/Article.html

Sorry, but what I'm not getting here? If there where a 99-04 cobra to strip, would it not be easier to get the knuckle with the Hub and the rotor and be done?
Aside the Fast Ed stuff and MK8(or MN12 w. Disk)axles and new bearings?

1999-2004 Cobra M-5970-A Knuckles , Original equipment on 1993-98 Mark VIII, 1989-97 Thunderbird, and 1999-2004 Cobra
http://www.jegs.com/i/Ford-Racing/39...oductId=762762

Thanks'

-Maic

Maic.


My idea of "help from above"... Is a sniper on the Roof
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post #11 of 23 (permalink) Old 08-11-2011, 01:17 AM
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That Jegs/Ford Racing ad is very confusing because all you are buying is M-5970-A, which is the MN12/FN10 spindle, but I'll break it down...

The spindle...http://www.fordracingparts.com/parts...tKeyField=7828
The hub...http://www.fordracingparts.com/parts...tKeyField=8397
The bearing...http://www.fordracingparts.com/parts...tKeyField=7818

You'll see that the spindle is original equipment for MN12/FN10, while the hub is 99+ Cobra, and the bearing is the same for all.

With only adding the punctuation, the ad reads like so;

M-1109-A - 5 x 4.5" bolt circle, 2.775" wheel pilot hub for popular Mustang size wheels. Should be used with IRS knuckle M-5970-A. Original equipment on 1999-2004 Mustang Cobra

M-1215-A - For use with kit car IRS hub M-1109-A. Original equipment on 1993-98 Mark VIII, 1989-97 Thunderbird, and 1999-2004 Cobra

M-5970-A - Knuckles for use in kit car IRS systems. Hub not included! Use with M-1109-A. Sold separately. Includes M-1215-A. Original equipment on 1989-97 Thunderbird and 1993-98 Mark VIII

-Joe-
1994 Ford Thunderbird SC 5-Speed
1996 Ford Mustang SVT Cobra #1251

Last edited by davis97xr7; 08-11-2011 at 01:28 AM.
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post #12 of 23 (permalink) Old 08-11-2011, 07:18 AM
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Yes Joe I am using new Cobra hubs with the Tbird center hub pressed in so they fit our axles.

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post #13 of 23 (permalink) Old 08-11-2011, 10:12 AM
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Quote:
Originally Posted by 91bluecoupe View Post
Yes Joe I am using new Cobra hubs with the Tbird center hub pressed in so they fit our axles.
I knew you were using Cobra hubs but earlier you mentioned that he needed Cobra spindles. I wasn't 100% sure if they worked so that's why I asked about the spindles. What do you mean the "Tbird center hub pressed in", the Tbird bearing?

-Joe-
1994 Ford Thunderbird SC 5-Speed
1996 Ford Mustang SVT Cobra #1251
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post #14 of 23 (permalink) Old 08-11-2011, 11:18 AM
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The center section that has the splines. The parts in my picture. Have to be pressed out of the spindles...sorry my bad for saying it that way.
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post #15 of 23 (permalink) Old 08-12-2011, 10:14 AM Thread Starter
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Thanks for all the info,it seems the tires are going to cost me more than anything else.So basically get some of the rear stuff off of a TB or Mk8 with disk brakes,and then the Cobra parts I need.The yard I go to here ,if I ask for the spinals they will give me all the parts on the spinal including rotors ,calipers.They don't like to waste time taking that stuff off and that saves money and left over parts.
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post #16 of 23 (permalink) Old 08-12-2011, 11:22 AM
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rear's

Hello

You don't need the Cobra parts to convert to rear disc.

You only need Cobra parts if you go over sized on the rear brakes.


Paul [email protected]
1990 Thunderbird Circle Track Street Stock
351W 2bbl.
C-4 Auto
3.90 open rear
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post #17 of 23 (permalink) Old 08-12-2011, 03:25 PM Thread Starter
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Quote:
Originally Posted by tbirdtess View Post
Hello

You don't need the Cobra parts to convert to rear disc.

You only need Cobra parts if you go over sized on the rear brakes.

Thanks,I intend to go all the way eventually,but good to know I dont have to right now.
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post #18 of 23 (permalink) Old 08-12-2011, 08:12 PM
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Lightbulb

Quote:
Originally Posted by tbirdtess View Post
Hello

You don't need the Cobra parts to convert to rear disc.

You only need Cobra parts if you go over sized on the rear brakes.

He needs Cobra hubs for the SN-95 bolt pattern though.

-Joe-
1994 Ford Thunderbird SC 5-Speed
1996 Ford Mustang SVT Cobra #1251
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post #19 of 23 (permalink) Old 08-12-2011, 10:12 PM
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If you change the bolt circle in the rear, it's simpler to use the Cobra rotors and a relocation bracket than to redrill and enlarge the center bore in T-Bird rotors, even if you don't upgrade the front brakes.

98 Toreador Red Mark VIII LSC - 13.221 @ 104.91
95 Pearl White Thunderbird SC 5spd - 12.879 @ 106.66
98 Laser Red/Black Cobra Coupe (T-56/IRS) - 12.483 @ 110.94
My Web Site
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post #20 of 23 (permalink) Old 08-13-2011, 06:01 AM Thread Starter
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Quote:
Originally Posted by DLF View Post
If you change the bolt circle in the rear, it's simpler to use the Cobra rotors and a relocation bracket than to redrill and enlarge the center bore in T-Bird rotors, even if you don't upgrade the front brakes.
Thats the way I will be doing it,is anyone still making the brackets for sale?
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post #21 of 23 (permalink) Old 08-13-2011, 09:03 AM
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Quote:
Originally Posted by Scars View Post
Thats the way I will be doing it,is anyone still making the brackets for sale?
http://www.sccoa.com/forums/showthread.php?t=120811

98 Toreador Red Mark VIII LSC - 13.221 @ 104.91
95 Pearl White Thunderbird SC 5spd - 12.879 @ 106.66
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Delrin IRS Bushing Kits - UHMW Spring Perches - SS Steering Joints
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post #22 of 23 (permalink) Old 08-13-2011, 10:05 AM
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That brackets look neat!!

PACO.
I wish I can have enough time and money to work on my thunder.
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“The phoenix hope, can wing her way through the desert skies, and still defying fortune's spite; revive from ashes and rise.”
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post #23 of 23 (permalink) Old 08-13-2011, 12:19 PM
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Rears

Hello

Sorry you don't need Cobra hubs.

Mine are 4 1/2 pattern All factory parts. (except the wheel studs)
I used irsmachine.com for the hubs.
redrilled my rotors. factory calipers.




also DLF bushings.

Paul [email protected]
1990 Thunderbird Circle Track Street Stock
351W 2bbl.
C-4 Auto
3.90 open rear
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