The mother of all IRS braces! But... - TCCoA Forums
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post #1 of 56 (permalink) Old 05-23-2004, 08:36 PM Thread Starter
 
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The mother of all IRS braces! But...

Unfortunately, it won't fit the factory T-Bird rear cover (at least on a '93 V8 8.8). There are some supports that interfere with the brace, right where the rear mount extrudes from the cover. I tried grinding it, but too much material needs to be removed to make it work.



The good news is, that it fits the Mark Viii cover perfectly with no mods (see pic below, '97 Mark Viii). It will also fit the 99+ Cobra covers. The '03 Cobra cover seems to be a good mod along with this brace to make it bulletproof.



This brace totally prevents this from happening:

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post #2 of 56 (permalink) Old 05-23-2004, 08:48 PM
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question to thoes that might know. is there a difference between the 93 and the 96 covers?

the 373 rear pumpkin that is popular from the frpp catalog is that cover the same as jeff's mark?

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post #3 of 56 (permalink) Old 05-23-2004, 09:05 PM Thread Starter
 
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There's a '96 that I can look at real quick and report back...the brace WILL fit the 99+ Cobra covers.
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post #4 of 56 (permalink) Old 05-23-2004, 09:12 PM Thread Starter
 
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Dammit...that '96 has the FRPP in it, but I did verify that it will fit that cover. If someone has a good pic of a factory cover I can take a look and see if it'll work.

I wrote the designers of the brace to see if they would be interested in making a small design change to make it work on the T-Bird covers...we'll see how that goes.
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post #5 of 56 (permalink) Old 05-23-2004, 09:38 PM
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I've actually be beating an idea like that around for some time now..glad to see others are thinking about that weak area as well.
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post #6 of 56 (permalink) Old 05-23-2004, 11:07 PM
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Was that car with the broken cover using the OEM rubber mounts? It seems most of the failures I've seen have them. I would expect stiffer mounts front and rear would take a lot of the stress off the covers - the problem isnt that the covers suck (though they are pretty weak), but that they're being twisted.

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post #7 of 56 (permalink) Old 05-23-2004, 11:24 PM
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You left out the important part.....where do we get it and what's it cost???

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post #8 of 56 (permalink) Old 05-23-2004, 11:31 PM
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still need the stock 96 8.8 rear cover pic? i can snap a pic from mine on tuesday.
let me know ok?

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post #9 of 56 (permalink) Old 05-24-2004, 01:49 AM
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I like that brace. I as well would like to know if it fits the cover on a 96. I also would like to know who makes it.


I really would have hate to have been driving that car when that broke!!!!!

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post #10 of 56 (permalink) Old 05-24-2004, 07:47 AM Thread Starter
 
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It was made primarialy for the 03 Cobra guys, who seem to toast diff covers and half shafts like there's no tomorrow. Please post up the pic of the '96 rear cover and I'll take a look at it and let you know. Basically, if it has a large casting support/rib in the lower right corner, the brace won't fit. Again, this is not an issue for guys with the FRPP unit or a Mark Viii rear cover, It'll fit. Actually, I was quite suprised to find out the T-Birds had a different cover...par for the course in the T-Bird vs Mustang parts interchangabilty I guess!

You can find the brace here. It's $210.00 shipped. So far, no one has broken a rear cover, even when side-stepping the clutch at 7000. Should be plenty strong enough for us!

IRS COVER BRACE SPECS
* FABRICATED FROM 1/4" 1018 STEEL PLATE
* MADE IN THE U.S.A. BY BILLETFLOW
* FULLY FILLET-WELDED USING MIG PROCESS
* POWDER COATED SAFETY RED
* GRADE 8 FASTENERS INCLUDED
* SIMPLE INSTALLATION USING HAND TOOLS

Disclaimer: I'm not associated with these guys, I was only in on the group purchase and reporting my findings to the T-Bird community Thanks to 392Bird for pointing it out to me in the first place.
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post #11 of 56 (permalink) Old 05-24-2004, 01:03 PM
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Quote:
Originally posted by Sir William
You left out the important part.....where do we get it and what's it cost???
Actually I posted about this quite a while back and the only person that seemed to care was 392Bird.

Original thread


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post #12 of 56 (permalink) Old 05-24-2004, 02:38 PM
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the frpp rear uses the mark8 casting from what i understand.
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post #13 of 56 (permalink) Old 05-24-2004, 03:42 PM
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that is one tough looking bracket

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post #14 of 56 (permalink) Old 05-24-2004, 04:39 PM
 
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I found this a while back. What about this instead?

http://www.jblmotor.com/prods/rearcov.htm
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post #15 of 56 (permalink) Old 05-24-2004, 06:22 PM
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Since that appears to butt right against the factory mount integrated into the cover, it is not going to bolt to the chassis mount, you'll have to make a new mount of some type on the chassis too. Not an issue on the Cobras, they don't mount to both sides, exactly why they are far more likely to break covers anyway. I see no need for this on these cars, I know of no one breaking one yet.
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post #16 of 56 (permalink) Old 05-25-2004, 05:09 PM
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Quote:
Originally posted by Fusion0507
I found this a while back. What about this instead?

http://www.jblmotor.com/prods/rearcov.htm
That is for solid axle cars, we have IRS. Notice there is no rear mount.

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post #17 of 56 (permalink) Old 05-25-2004, 07:51 PM
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"Has a rear flange for IRS center section mounting or a mount for Watts type linkage for the beam axle unit."

Looks like it's IRS to me.

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post #18 of 56 (permalink) Old 05-25-2004, 10:35 PM
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Quote:
Originally posted by kdanner
I see no need for this on these cars, I know of no one breaking one yet.



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post #19 of 56 (permalink) Old 05-26-2004, 12:03 AM
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Quote:
Originally posted by MaddMartigan
"Has a rear flange for IRS center section mounting or a mount for Watts type linkage for the beam axle unit."

Looks like it's IRS to me.

That's my bad, just glanced at the pictures.

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post #20 of 56 (permalink) Old 05-26-2004, 04:43 AM
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Actually you may be on to something. Based on the pics above, the new one doesn't seem to align the same as the one that's supposed to be for our cars. I haven't looked very close before but that seems a bit odd.
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post #21 of 56 (permalink) Old 05-26-2004, 10:44 AM
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Quote:
Originally posted by racecougar





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post #22 of 56 (permalink) Old 05-26-2004, 11:36 AM
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No KD, that's from a split-port 3.8L V-6 4R70W car.
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post #23 of 56 (permalink) Old 05-26-2004, 12:37 PM
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Yep, that was on my splitport 94 LX with a 4R70W. I'm still placing all of the blame on the old bushings, everything has worked great since I installed poly front diff mounts and SC "fat shafts". By the way, that was just WOT from a stop sign, without any wheel hop. The tires spun for a couple feet, grabbed, and POW!

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post #24 of 56 (permalink) Old 05-29-2004, 02:02 PM
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I will need to get one of them since I have slicks now.
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post #25 of 56 (permalink) Old 05-29-2004, 05:51 PM
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Quote:
Originally posted by blown96bird
I will need to get one of them since I have slicks now.
You going to fabricate your own custom rear mount for it to work ?

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post #26 of 56 (permalink) Old 05-31-2004, 11:46 PM
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Has anyone tried the girdle cover by FRPP yet? I hear it will bolt directly to the T-birds, from what I hear it is about the only one set up as a direct bolt on for our cars. Is there any truth in this?

Where do you get the poly bushings mentioned earlier, are they sold by MN-12?

Last edited by BIG PERV; 06-01-2004 at 01:43 PM.
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post #27 of 56 (permalink) Old 06-01-2004, 03:21 AM
 
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Quote:
Has anyone tried the girdle cover by FRPP yet?






From the looks of the picture, I dont see any way to tie it to the IRS subframe.
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post #28 of 56 (permalink) Old 06-01-2004, 09:23 AM
 
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It doesn't have the rear diff mount on it
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post #29 of 56 (permalink) Old 06-01-2004, 01:48 PM
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So what happens if you put a cover on without the diff mount? I have heard of alot of guys using the FRPP rear end, does it have a rear diff mount? If not why not?

From my understanding it is the same thing as the stock one in our cars, just Aluminum for lighter weight. Might be a silly question, but why is the rear diff mount so important? Does the cobra or the IRS mustang use the diff mount?
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post #30 of 56 (permalink) Old 06-01-2004, 01:51 PM
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BTW, when I talked to Rich (tell me I remembered the name right) at MN-12 awhile back he said he was working on a new cover for our cars, so maybe ther is some hope to soon be had.

If you're out there please let us know the progress on this one
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