IRS on a 98? - Mustang Evolution

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Old 07-04-2011, 10:30 AM   #1
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IRS on a 98?

Saw this on Craigslist. What all is usually involved with an IRS... Axles, diff, gears? If so, it would seem this is a good deal. Did that year Cobra come with T-locs?
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"i have an independent rear suspension out of a 99 cobra. it is all complete from disc to disc with shocks, springs, brakes everything. it will bolt on right up to 94 to 04 mustangs. i had it on my 98 and it worked very nice. it will also work on custom aplications like in street rods, hot rods or....."
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Old 07-04-2011, 10:44 AM   #2
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Quote:
Originally Posted by Greg687
Saw this on Craigslist. What all is usually involved with an IRS... Axles, diff, gears? If so, it would seem this is a good deal. Did that year Cobra come with T-locs?
Thanks

"i have an independent rear suspension out of a 99 cobra. it is all complete from disc to disc with shocks, springs, brakes everything. it will bolt on right up to 94 to 04 mustangs. i had it on my 98 and it worked very nice. it will also work on custom aplications like in street rods, hot rods or....."
Will work but why do it???
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Old 07-04-2011, 12:03 PM   #3
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It's stronger and better brakes
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Old 07-04-2011, 12:05 PM   #4
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It's stronger and better brakes
I guess. But if your gonna drop in a beefed up v8 you won't want it.
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Old 07-04-2011, 02:15 PM   #5
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Re: IRS on a 98?

Mainly want the gears and t-loc. The IRS is a bad thing? I have no plans for a V8 in this car... maybe a few mods or a built up 6 one day.
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Old 07-04-2011, 02:35 PM   #6
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Quote:
Originally Posted by Greg687
Mainly want the gears and t-loc. The IRS is a bad thing? I have no plans for a V8 in this car... maybe a few mods or a built up 6 one day.
IRS and high horsepower causes wheel hop which can do many things including transmission input shaft snapping
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Old 07-04-2011, 09:53 PM   #7
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Re: IRS on a 98?

Thanks. I guess I won't be worrying about that.
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Old 07-04-2011, 09:54 PM   #8
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Thanks. I guess I won't be worrying about that.
No lol. Takes 400 or more hp to really matter.
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Old 07-05-2011, 07:54 AM   #9
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Quote:
Originally Posted by Texastboneking

IRS and high horsepower causes wheel hop which can do many things including transmission input shaft snapping
Input shaft breaking has been the result of high hp and not enough splines on the input shaft. The stock 10 spline cobra input shaft can't hold the higher power.

The half shafts are what break from the wheel hop and don't take a lot of power to snap. They are known to break at stock cobra power levels if you wheel hop.

However, if you replace the rubber bushings in the IRS, you will be good to go. I'm putting down over 600 to the wheels and my IRS is just fine.
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Old 07-05-2011, 08:00 AM   #10
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Originally Posted by PureVenom

Input shaft breaking has been the result of high hp and not enough splines on the input shaft. The stock 10 spline cobra input shaft can't hold the higher power.

The half shafts are what break from the wheel hop and don't take a lot of power to snap. They are known to break at stock cobra power levels if you wheel hop.

However, if you replace the rubber bushings in the IRS, you will be good to go. I'm putting down over 600 to the wheels and my IRS is just fine.
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Old 07-05-2011, 09:17 AM   #11
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Re: IRS on a 98?

the IRS when done right is a great item, you just have to replace all the bushings and the other little things when installing it. Also the track will be wider when installed on a pre 99.
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Old 07-05-2011, 10:10 AM   #12
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Re: IRS on a 98?

There are a ton of 03/04 Cobra owners with high HP that swear by their IRS and with the addition of the Derilin (spelling?) bushings they are just fine. A buddy of mine threw a 03 termi IRS in his fox and it works great.
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Old 07-05-2011, 10:20 AM   #13
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Re: IRS on a 98?

some say SRA works, been proven, dont mess with it... and thats perfectly fine in drag racing. when it comes to autox both work great when setup right once again, its preference and different tracks may yield one or the other superior~ etc

the IRS is great when setup right and rides amazing, for a daily driver its a very nice setup when you do a few little upgrades.
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