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Old 07-22-2015, 03:47 PM   #1
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Irs swap

I just wanted to know exactly what i need for the swap into my 04 mustang gt, and which cars i can take the irs from for an easy swap.

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Old 07-30-2015, 07:48 AM   #2
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Not gonna lie, you'll probably get more hits in the 99-04 GT section.

Now for your question, the swap is a straight swap for the most part. The IRS uses all the factory SRA mounting points. If you're gonna swap in an 03/04 Cobra IRS then you're gonna need either a terminator driveshaft flange and a hybrid u-joint or swap the GT differential flange onto the Cobra IRS. The GT exhaust will no longer fit so you will need to get a Cobra catback as well. You can swap it from the 99/01 Cobra or the 03/04 Cobra.

I went through the swap about 3 years ago so if you have questions then feel free to ask.
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Old 07-30-2015, 02:17 PM   #3
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Any IRS from a 99-04 Cobra. 03/04 units are the best. 99 is the weakest, 01 is kinda between.

-Modify your E brake cables
-Modify brake lines
-Cobra catback or run dumps or side pipes
-Driveshaft flange from a 99-04 Cobra

Recommend you upgrade the whole thing with the Full Tilt Boogie Racing bushing kit while its out if you don't like wheel hop.

The IRS itself is a heavy beast but bolts right in as far as actually securing it to the chassis.
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Old 08-12-2015, 08:52 AM   #4
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Quote:
Originally Posted by Mile high JDF View Post
Not gonna lie, you'll probably get more hits in the 99-04 GT section.

Now for your question, the swap is a straight swap for the most part. The IRS uses all the factory SRA mounting points. If you're gonna swap in an 03/04 Cobra IRS then you're gonna need either a terminator driveshaft flange and a hybrid u-joint or swap the GT differential flange onto the Cobra IRS. The GT exhaust will no longer fit so you will need to get a Cobra catback as well. You can swap it from the 99/01 Cobra or the 03/04 Cobra.

I went through the swap about 3 years ago so if you have questions then feel free to ask.


Will it be easier for me to just buy the IRS cage than buy all new parts n build it myself or go the route of buying one used n swapping old with new ? Which would you think is Cheaper?



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Old 08-12-2015, 10:04 AM   #5
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By far it is better to find a complete unit.
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Old 08-12-2015, 04:55 PM   #6
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By far it is better to find a complete unit.
+1

Piecing together a unit is gonna be far more expensive and time consuming that it is to try and find one for sale or find a guy who is willing to trade.
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Old 09-11-2015, 08:46 PM   #7
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ID:	190988 about to grab this for 500$ dollars 120miles on an 00-01 I believe. Thoughts ? Advice ?


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Old 09-11-2015, 09:05 PM   #8
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Sounds like a good deal to me. Just remember you're gonna have to buy a catback
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Old 09-11-2015, 09:09 PM   #9
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Was thinking just doing straight pipes


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Old 09-12-2015, 07:09 AM   #10
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Straight pipes sound like ****. Remember at that mileage the rubber bushings in that irs will be toast. They should be replaced anyway even if new.

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Old 09-25-2015, 05:43 PM   #11
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So I've been hearing all this talk about guys with IRS are converting to SRA cause they have big power and "that's the smart move" for a street car. Agree? Disagree ?


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Old 09-25-2015, 07:24 PM   #12
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So I've been hearing all this talk about guys with IRS are converting to SRA cause they have big power and "that's the smart move" for a street car. Agree? Disagree ?


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For a drag car, agree.

For a daily driver, Ehh.

For a corner carver, I gotta admit I like my IRS a lot more.

Even on stock power, I can feel the rear end feeling.. Swirly for lack of a better term. I'm not sure why, but my car does not suffer from wheel hop like people say the cobras do. Then again, I have recently discovered that my suspension is not stock. I do not know what all has been done, because I do not even know what stock vs. aftermarket parts look like. Some of it doesn't look OEM to me but I'm too uncertain lol. Springs are easy to identify. And the fact that I could'nt get my floor jack under this car or fit a basketball between the front tire and fender like I could with my 99 GT was what originally got me wondering
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Old 09-25-2015, 07:31 PM   #13
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Yeah I mean it's not going to be a daily driver it's a street car but I'll mostly take it out on weekends n to shows and road course track when I get free time. Idk what I should go with IRS or built SRA


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Old 09-25-2015, 08:21 PM   #14
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The IRS in the 99-04 Mustangs is pretty garbage honestly. Ford took the same overall suspension and body design and just tried to change the rear suspension, which is a terrible idea. The entire car's suspension and body needs to be based around the IRS, not the other way around. It is a bit more comfortable as a DD than the SRA, but for straight line you will benefit much more from an SRA, and for corners you can pretty much make the SRA handle the same if not better than the IRS.
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