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Old 04-03-2009, 01:00 AM   #1
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IRS Swap?

Just curious and trying to get an idea of what everyone thinks. Not like I've come across one. I know I can put the money into beefing up the rear end, but I like the idea of a smoother ride, perhaps the better cornering. I'm not planning on drag racing, maybe I will head to the track once in a while to see how well I can do, but the closest track is Atco in NJ. Since I do a lot of driving I think it would be nice. It would also most likely be a project getting parts over a long period of time as well as keeping the stock axle so I can always swap. From what I understand it's a direct bolt on. I just have to have a Cobra exhaust as the GT won't fit (no room for the over axle exhaust).

Some other pros for the idea:
It gives me something else to do!
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Old 04-03-2009, 01:09 AM   #2
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Re: IRS Swap?

i wouldn't your chassis won't be as stiff from what i hear
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Old 04-03-2009, 05:52 AM   #3
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Re: IRS Swap?

If you want a heavier car, it's a great idea.

Personally I think IRS on the Fox platforms just isn't a good idea, but to each his own. You could end up spending a lot of money too.
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Old 04-03-2009, 06:08 AM   #4
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Re: IRS Swap?

Does it help it's not for a foxbody but a new edge? </hoping it helps>

I know the 80 lbs is a pretty big trade off, but IDK, I guess I'd feel special if I had an IRS that I put in.

And I will put it this way too, I'm not going out and spending a G or two for a nearly used IRS. I plan on waiting until some guy wrecks his cobra and I see parts lying around on craigslist I'd hope to be getting cheap. Chances are: I know I know. I figure though it is something good to look out for now if the opportunity did ever come up then be pacing if I didn't have a plan.

Then again I guess I should really invest in the T-Lok and sorts, I have much reading to do on the stock 8.8 rear.
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Old 04-03-2009, 05:11 PM   #5
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Re: IRS Swap?

All 79-04 Mustangs are still built on the Fox platform. They're just not all referred to as Foxbodies. The platform just really was not built with IRS in mind. If you can get one cheap enough though, it'll at least be a fun swap. I just wouldn't recommend spending a lot on it.
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Old 04-03-2009, 08:32 PM   #6
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Re: IRS Swap?

Wow didn't know that.

All right cool. So if I trip over one take it, but don't make it my primary project. I would probably stiffen up the body too would this help any?

Like you said, I'd like for a fun swap in mind
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Old 04-03-2009, 10:45 PM   #7
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Re: IRS Swap?

a perfect setup irs vs a perfect setup solid rear axle the irs wins... but... perfect is different for every person and you have to be able to and want to drive the car to the limits.

My irs car rides much better and all that but a well setup sra is a great handling car as well
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Old 04-04-2009, 06:17 PM   #8
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Re: IRS Swap?

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Does it help it's not for a foxbody but a new edge? </hoping it helps>

I know the 80 lbs is a pretty big trade off, but IDK, I guess I'd feel special if I had an IRS that I put in.

And I will put it this way too, I'm not going out and spending a G or two for a nearly used IRS. I plan on waiting until some guy wrecks his cobra and I see parts lying around on craigslist I'd hope to be getting cheap. Chances are: I know I know. I figure though it is something good to look out for now if the opportunity did ever come up then be pacing if I didn't have a plan.

Then again I guess I should really invest in the T-Lok and sorts, I have much reading to do on the stock 8.8 rear.

In most cases an IRS provides less un-sprung weight, which makes a hell of a difference when compared to the SRA.
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Old 04-04-2009, 09:25 PM   #9
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Re: IRS Swap?

What do you mean/what is the difference?
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Old 04-05-2009, 09:29 AM   #10
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Re: IRS Swap?

Unsprung weight - Wikipedia, the free encyclopedia

Thats all you need to know ^

Obviously the IRS makes the car more of a curve hugger and smoother for bumps. One reason for this is due to less un-sprung weight controlling the inertia of the vehicle around curves. Less un-sprung wieght also allows for a quicker launch becuase it takes less force to make the vehicle begin moving.

Ex. If you have a passenger in the car its "Sprung" weight (suspension is carrying the weight). The car can control that weight a lot easier than having HEAVY rims... That's why you don't see guys making their best pass in 18" Saleens.
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Old 04-05-2009, 10:53 AM   #11
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Re: IRS Swap?

also every 1 pound or extra mass on a rotating object (drive shaft, wheels, etc) is equal to about 10 ponds of dead weight. So... if your rims each are 10lbs heaver than others that 100lbs extra rotation mass per wheel, its like the car is 400lbs heavier
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Old 04-15-2009, 11:39 AM   #12
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Re: IRS Swap?

What did you ever decided to do?
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Old 04-15-2009, 12:26 PM   #13
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Re: IRS Swap?

I'm holding off on it for now. While I like the idea of building up a nice IRS set up it will be many a years and money to do. For now I'm going to learn about T-Lok, gears and all that good stuff and make my SRA bullet proof (even though it doesn't have to be ). When I come across the parts that benifit me I'm going to pick them up.

Then one day I'll have the option of using SRA or IRS and just swap 'em how I feel that day

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Old 04-15-2009, 03:32 PM   #14
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Re: IRS Swap?

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I'm holding off on it for now. While I like the idea of building up a nice IRS set up it will be many a years and money to do. For now I'm going to learn about T-Lok, gears and all that good stuff and make my SRA bullet proof (even though it doesn't have to be ). When I come across the parts that benifit me I'm going to pick them up.

Then one day I'll have the option of using SRA or IRS and just swap 'em how I feel that day

Good, let me know if you wanna swap IRS for SRA or anything down the road. I enjoyed rebuilding my SRA in my '01. I learned a lot of interesting information.
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Old 04-15-2009, 11:56 PM   #15
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Re: IRS Swap?

There's something else I'm curious about...

For someone learning the trade on their own, how difficult would it be to do gears and a beefed up rear end really?

I currently have a Haynes manual as a guide and a couple of other sources and references. I'm the kind of person that believes in DIY and learn from experience not to mention I want to have my hands on much of my car as possible.

If it makes any difference I will also probably get a second SRA and use that to build up, learn and do gears, so again I'll have an extra axle laying around (and eventually for that swap 8)). I'll also mention that I want to make sure I can get this car back to stock anytime I want, that I'm actually looking for original parts since mine had a few mods done to it when I picked it up.
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Old 04-16-2009, 07:26 AM   #16
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Re: IRS Swap?

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There's something else I'm curious about...

For someone learning the trade on their own, how difficult would it be to do gears and a beefed up rear end really?

I currently have a Haynes manual as a guide and a couple of other sources and references. I'm the kind of person that believes in DIY and learn from experience not to mention I want to have my hands on much of my car as possible.

If it makes any difference I will also probably get a second SRA and use that to build up, learn and do gears, so again I'll have an extra axle laying around (and eventually for that swap 8)). I'll also mention that I want to make sure I can get this car back to stock anytime I want, that I'm actually looking for original parts since mine had a few mods done to it when I picked it up.

Its a pretty simple process for most everything on the vehicle. For the rear end you would need some special tools and some training on the knowledge of the rear end. All in all if you have the 'want' to learn then it will all come in time and be very simple. But remember its a never ending process!
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Old 04-20-2009, 11:05 AM   #17
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Re: IRS Swap?

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Just curious and trying to get an idea of what everyone thinks. Not like I've come across one. I know I can put the money into beefing up the rear end, but I like the idea of a smoother ride, perhaps the better cornering. I'm not planning on drag racing, maybe I will head to the track once in a while to see how well I can do, but the closest track is Atco in NJ. Since I do a lot of driving I think it would be nice. It would also most likely be a project getting parts over a long period of time as well as keeping the stock axle so I can always swap. From what I understand it's a direct bolt on. I just have to have a Cobra exhaust as the GT won't fit (no room for the over axle exhaust).

Some other pros for the idea:
It gives me something else to do!
Osiris,

Here's how they do it on a Fox Body. IRS INTO FOX BODY

I'm sure there are many similarities to the New Edge. Ideal is to find a Cobra guy who wants a stick axle and trade him.

Seems like one of the magazines ran an article on how to do your swap a few years ago.

Good Luck,
Jim
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Old 04-20-2009, 11:26 AM   #18
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Re: IRS Swap?

Thanks man.

Yeah I must have come across that same article like 15 times It seems that there are 4 bolts that will put it right into place, direct swap, the only concern would be the yoke(?). the 99 Cobras don't need a new yoke where the 03/04's yoke is slightly longer, but it's an easily swapped part.

As for the whole trading thing, I'm not really keen on it. I know it's the absolute way to go, however I like the idea of going back to original parts.
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Old 04-20-2009, 11:39 AM   #19
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Re: IRS Swap?

That's what I do and therefore have a garage full of parts that's a thorn in Miss Jayne's (my wife's) side!
Jim
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Old 04-20-2009, 12:58 PM   #20
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Re: IRS Swap?

If all goes as I think it will, I will probably have to rent a storage unit, keep parts there and will probably learn how to build an engine in there
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Old 04-20-2009, 05:23 PM   #21
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Re: IRS Swap?

I doubt you find an 99-04 Mustang IRS owner that wants to swap A Fox Solid for their IRS... Its like 1.5 Inches shorter in width. (Fox SRA shorter than IRS)

Its a stretch for some that go from 99-04 IRS to 94-98 Solid Axle because it's about .75 Inches shorter.
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Old 04-23-2009, 01:36 AM   #22
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Re: IRS Swap?

It might help that I'm not driving a Fox.
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Old 04-23-2009, 06:47 AM   #23
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Re: IRS Swap?

^ has a new edge, which would make him an ideal swap canidate with a irs guy. both has its pros and cons, but either way u cant really go wrong. for comfort and handling the irs is the way to go. it all depends on what u want to do with the car later down the road.
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Old 04-23-2009, 08:14 AM   #24
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Re: IRS Swap?

Why or where did I get the idea you had a fox??? lol :
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Old 04-23-2009, 08:25 AM   #25
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Re: IRS Swap?

no telling, there have been alot of new fox body members join recently lol.
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Old 04-23-2009, 12:17 PM   #26
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Re: IRS Swap?

Aw, I think it was right after I commented on the article about the IRS swap into a Fox body being similar to the Fox. Then someone said that the NE Mustangs were a continuation of the Fox. Then the conversation turned. That's the way it seemed to me.
Jim
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Old 04-23-2009, 01:03 PM   #27
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Re: IRS Swap?

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Aw, I think it was right after I commented on the article about the IRS swap into a Fox body being similar to the Fox. Then someone said that the NE Mustangs were a continuation of the Fox. Then the conversation turned. That's the way it seemed to me.
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Old 04-23-2009, 01:20 PM   #28
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Re: IRS Swap?

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Your car makes me jealous
If you're talking about me and the red original owner 347 1992 GT, it's for sale. Needs a younger person to take it from here.
Jim
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Old 04-23-2009, 01:30 PM   #29
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Re: IRS Swap?

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If you're talking about me and the red original owner 347 1992 GT, it's for sale. Needs a younger person to take it from here.
Jim
Whats the asking price anyway
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Old 04-23-2009, 01:44 PM   #30
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Re: IRS Swap?

If you go to website you can see all the details. But, it's pretty much had the Summit catalog thrown at it. I'm asking 15K. It's kind of like losing a member of the family. I bought it new (as well as the '02 and the '08 Bullitt) and would like to keep it. But, it needs more exercise than I can give it.
Jim
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Old 04-23-2009, 02:02 PM   #31
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Re: IRS Swap?

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If you go to website you can see all the details. But, it's pretty much had the Summit catalog thrown at it. I'm asking 15K. It's kind of like losing a member of the family. I bought it new (as well as the '02 and the '08 Bullitt) and would like to keep it. But, it needs more exercise than I can give it.
Jim
Yea, I couldn't follow the link at work. Looks nice though!
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