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Sra swap worth it????

3144 Views 9 Replies 4 Participants Last post by  WFO
I know this subject has been beat to death but. I’ve got an 01 Cobra. Basically stock just some minor mods done. Eventually down the road I’ll be installing twin turbo. A local guy wants to swap his sra with me. Is it really worth it? As far as exhaust ect...?
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It always seemed like the GT owner was getting the better end of the swap to me.
Both owners are usually getting what they want though...

The advantage of swapping to a SRA is that they can be built very strong, for very little money, using common factory parts, as opposed to the IRS, which requires a sizable investment, using aftermarket parts, to achieve comparable results.

If it were me, I would wait until I installed the turbos before I seriously thought about swapping the rear end. That decision would be made with the hindsight of knowing that a lot can happen between now and "Eventually, down the road".
If you do, eventually, decide to swap to a SRA later on, you shouldn't have any difficulty finding a GT owner to trade with. You might even try to find someone who has recently rebuilt their entire rear using 31 spline axles and differential, ideally, that way you would end up with a bullet-proof setup out of the trade.
I would do the swap ONLY if you want to get serious about drag racing. Otherwise it's not worth.
Those are the straight forward answers I was looking for. Thank you very much.
It costs just as much money to PROPERLY build a SRA as it does the IRS. Street car, stay IRS. You can do a full rebuild yourself in your driveway no problem. I did. And I swapped TO an IRS because I like a car to actually be able to corner properly.
It costs just as much money to PROPERLY build a SRA as it does the IRS.
How is this possible?
The bushing kit alone is 6-700 dollars.
A set of OEM half-shafts cost $800... Upgraded Level 2 half-shafts are double that!
That's not everything, as you know.
And after you've done everything that there is to do to try to solve the wheel hop problem, if for some unexpected reason, the damned thing starts hopping again, it is possible that even those expensive Level 2 half-shafts can fail under extreme stress.
In all fairness, though, you can break anything if you try hard enough. ;)

By their very nature, a SRA has less moving parts, so it is going to be less expensive to build, and less expensive to maintain when something does fail.
Let me ask this then. Honestly how bad is cornering hard with a sra compared to irs?
The general consensus is that there is no clear advantage to an IRS on a smooth surface such as a racetrack. I used to autocross my Bullitt regularly, and I don't recall ever being beat by a Mustang equipped with IRS. All of the fast cars had a stick rear end. There were no 2015-up cars back then.... So I guess I'll find out if that changes! :lol:
The real advantage to IRS is on the bumpy public roads. It feels more planted, and doesn't hop around like a SRA is prone to do when hitting bumps with the wheel that is on the inside of the corners.

The stock rotating assembly in your engine will fail before you start having too many issues with the IRS in your car. So there will be more work required, than just adding a turbo kit, before you are at a power level where the IRS becomes an issue.
As I said earlier, I'd leave it in until it became impractical because of the power. It's one of the unique things about your car, and it is the superior rear end for just driving around and enjoying the car.
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SRA build = Axles, weld the tubes, torque boxes, all new control arms and then if you start adding TA/PHB setups it adds up quick. IRS if you already have the 03/04 axles its a bushing kit, the rear cover and go. Yeah the SRA is gonna be stronger in the end for drag racing but for pretty much any street car the IRS will hold up great and better on public roads. I would never bother with an IRS build that is going to be needing the DSS "level 5" or whatever shafts. If you are making enough power to break the OEM 03/04 shafts then that is when you swap to the SRA.

Agreed that if the car was a dedicated track car the SRA is probably the better bet with a 3 link. In all honesty if I was doing a track car like that I'd be going with a 05+ to do it. The SN95 really is godawful when you compare to the S197/S550.

My biggest reason for the IRS is #streetcar and the fact that here in Europe there might be ONE 1/4 track I could possibly go to 2 hours away and also nobody drag races here. There are definitely a ton of wide open roads, highways with no speed limit and curves tho, its super nice to hit a little bump on a hard corner and have the rear stay planted and not jump over 6 inches.
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I think I’m gonna stay irs for now. Do the few upgrades and roll with it. If nothing else maybe it’ll leverage me for a better sra should I switch later.
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