03 cobra rearend in sn95 questions

sonicsn95 · Nov 20, 2007

I know that Wyotech and Scarface swapped the rears on their cars, I was wondering what if any challenges go along with the swap? I might have a lead on one for my 97 and was interested in the rpos and cons of the swap. So Scarface/Wyotech let me hear ya!!

AaRoN · Nov 20, 2007

they got rid of the IRS...I know Dave did anyway.

Jrgunn5150 · Nov 20, 2007

Reviaxtorres swapped an IRS INTO his car, so he can help you out with specific's. It's pretty straightforward. It will ride a ton better, handling is argueable. When I really get on my Termiantor from a standstill though, it hop's so bad you just know something is going ot break. Of course that's fixable, but it's even more money to lay out. You can probably find a Termiantor owner and swap him pretty easily.

AaRoN · Nov 20, 2007

IRS- good for ride, bad for launch ;D

sonicsn95 · Nov 20, 2007

I plan to put this swap in my DD 97 gt. Not to worried about the wheel hop/launch issue. I have the 9 second Blue Hellion car for the times I feel the need for racing,I just want a nice riding street car and I like the thought of the IRS rear end.

AaRoN · Nov 20, 2007

sonicsn95 said:
I plan to put this swap in my DD 97 gt. Not to worried about the wheel hop/launch issue. I have the 9 second Blue Hellion car for the times I feel the need for racing,I just want a nice riding street car and I like the thought of the IRS rear end.

if it's just the ride your looking for then I'd go with the IRS O0

WyoTechMSA · Nov 20, 2007

Its alittle more coplicated when using the IRS from an 03/04. Its not as straight forward as everyone says it is, well it is and it isnt. The IRS assembly is BIG, and HEAVY. It is a cumbersom ass mofo to deal with to say the least. When Im on my computer tomorrow Ill send you a link that pretty much showed us everything, but there are still some things that were left out. As for the wheel hop, handling, ride quality and etc., its really all a matter of opinion. My car rides way better NOW than it did before, handles way better NOW than it did before...you see what im getting at.

Im waiting for DFG to come in here and tell you you are stupid for wanting to do it and how solid is better in every way this, IRS worse in every way that...but honestly man its the one thing ive done to my car that I am extremely happy with, it looks and works beautifully. I get questions about it all the time, compliments, looks, you name it.

Its worth it just for that LOL

AaRoN · Nov 20, 2007

That's hot Wyotech O0

WyoTechMSA · Nov 20, 2007

Thanks man I appreciate it. As for wheel hop, I got 3 letters

BFG

AaRoN · Nov 20, 2007

WyoTechMSA said:
Thanks man I appreciate it. As for wheel hop, I got 3 letters

BFG

stop man. i'm running outta napkins here

Jrgunn5150 · Nov 20, 2007

Yeah the rear shot look's weird to me, I can's get over it on mine. As for wheel hop, how would BFG's cure it, lol?

WyoTechMSA · Nov 20, 2007

Haha, even tho those wheels are hot im kinda startin to miss my old 98s. And to answer your question...ill ask you one, How can they hop if they dont spin?

Jrgunn5150 · Nov 20, 2007

I'm pretty sure I could turn em loose, even with a stock Terminator. I had them on my GT, wasn't all that impressed really. They do look cool tho

WyoTechMSA · Nov 20, 2007

Well Im sorry I dont own teh almighty TERMINATOR!!!!!!!!!!!!!!!!!!

SRT Handz · Nov 20, 2007

The reason i stuck with a Solid is because MM products can make a solid out handle a Mustang IRS..... IRS is just heavy a fuck

WyoTechMSA · Nov 20, 2007

Yes but its 150lbs. less unsprung weight

Javi · Nov 21, 2007

IRS FTW !!!!!!!!!!!! i found a guy that wants solid rear and i since i saw WYO'S im in love with th irs,he is waiting to get his car back from Powerhouse next month so we can do the swap

I CANT WAIT :noes:

reivaxtorres · Nov 21, 2007

here is mine.....

sitting in my truck waiting for install...

right after i installed it

from under the car

and next (kinda) SRT Handz car, the SRA vs IRS look

and all i can say about the IRS is that i love it. i had thought i was done with the whole drag racing thing, but ive kinda started to get back into it. the IRS does suck for that, you gotta invest some money into it to make it launch good and not get wheel hop, but for me its not that great of an issue, at least not enough to put money into it.

the car just feels so much better with it. the car doesnt dip as much when you hit the brakes anymore, and amazingly enough to me if felt as if it were lighter, not heavier. weight transfer is awesome, weight balance is better as well. one of the best mods ive done to my car, easy.

and yes, the 03/04 swap isnt as straight forward as the 99/01 swap. a few things that you will need.....

03/04 cobra driveshaft pinion flange
03/04 cobra rear brake lines (or mach1 lines)
IRS subframe bushings for a 12mm bolt (Maximum sells them), or get the proper 14mm bolt from Ford and drill out the torque boxes

-everything else just fits right in. the driveshaft will be a very, very tight fit, so if you have an aluminum one you can get it shortened by about 1/2" to an inch, or just learn to deal with it.
-2 holes will need to be drilled thru the chasis and into the trunck, or you can weld on the IRS brackets (im gonna weld mine in.....eventually)
-one part of the body needs to be dented out of the way to make the passanger side bracket work. a hammer works perfect for this.
-if you havent done it in a long time, change the fuel filter now. its gonna be a little harder later
-you can do it by yourself with hand tools, thats the way i did it. i used 4 jack stands to hold the car up, an engine hoist to help me move the IRS from place to place, and a 2 1/2 ton jack to help me lift the IRS in to the car. some people will tell you to lower the car onto the IRS, but i found it easier to raise it into the car.