Author Topic: 64-73 irs kit  (Read 6585 times)

TheJ

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64-73 irs kit
« on: November 24, 2010, 01:22:19 AM »
I found this 64-73 mustang irs kit on this website the other day and it was very interesting.
Has anyone ever had this setup or seen it on a car?

http://www.mustangirs.com/index.php

Thanks for reading

Jeff73Mach1

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Re: 64-73 irs kit
« Reply #1 on: November 24, 2010, 01:48:07 AM »
Big bucks for questionable return.  IIRC Ford track tested standard live axle rear suspensions vs their IRS back in the day and track times were no better.  Wheel hop and traction issues in a straight line are a problem with IRS units

A rear sway bar, thermoplastic moog suspension bushings and sway bar bushings, good shocks, proper springs, a good set of tires and heavy duty rear shackles will improve handling beyond what you can imagine.

Is the IRS better . . . maybe a little for a track car, but the difference is probably not worth the money to most people.  Until you upgrade the steering to something more positive and direct than the factory set up, a IRS is probably not a good investment.

But for the cool factor it would get a thumbs up.

Look at a Watts link for the rear to see what can be done that is highly effective and relatively inexpensive.

TheJ

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Re: 64-73 irs kit
« Reply #2 on: November 24, 2010, 02:02:06 AM »
I agree that it is quite expensive and for a street car not worth the money, I just found the fact that it was a factory option to be very cool.  I also appreciate the guys awesome effort he put into resurrecting it and serving a niche market.

Whats this about a Watts link? I am not familiar with this setup.

Thanks

Soaring

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Re: 64-73 irs kit
« Reply #3 on: November 24, 2010, 06:12:57 AM »
The Watts is a rear suspension unit designed to stabalize the rear during racing times.  Take a read. http://en.wikipedia.org/wiki/Watt's_linkage

TheJ

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Re: 64-73 irs kit
« Reply #4 on: November 24, 2010, 10:34:07 AM »
Thats a really cool setup.

Thanks for the info

Soaring

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Re: 64-73 irs kit
« Reply #5 on: November 24, 2010, 03:46:52 PM »
Yeah, but you have to have lots of loose change in your pocket.

TheJ

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Re: 64-73 irs kit
« Reply #6 on: November 24, 2010, 04:34:39 PM »
I was just looking for some sort of upgrades I could do when I redo the rear suspension and I came across the irs setup and found it really interesting.  I also found a $650 watts setup by fays2 but thats still a bit expensive.

Are there any relatively inexpensive upgrade I can do to the rear suspension? ie: springs, shocks, bushing, ect

66GTKFB

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Re: 64-73 irs kit
« Reply #7 on: November 24, 2010, 07:53:04 PM »
Think about a heavy duty rear sway bar and gas shocks. That's best done to the front end at the same time.  You can also get a pair of competition leaf springs. Don't even think of longer shackles.
Jim

TheJ

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Re: 64-73 irs kit
« Reply #8 on: November 24, 2010, 08:29:14 PM »
Is there anyway to raise the rear end a little bit because all of the 73 mustangs I've seen look like they are squatting even with stock ride height leaf springs

66GTKFB

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Re: 64-73 irs kit
« Reply #9 on: November 24, 2010, 11:53:58 PM »
What, you don't want to be a low rider and move to Southern California?
There are many combinatios of springs, shocks and sway bars that will lower, raise or keep a stock look. Try National Parts Depot http://www.npdlink.com/ or Mustangs Plus http://www.mustangsplus.com/ for ideas. That being said, a new set of springs will probably do wonders.
Jim

TheJ

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Re: 64-73 irs kit
« Reply #10 on: November 25, 2010, 12:02:21 AM »
I'll check those out

thanks for the info

Joe AZ 2 PA

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Re: 64-73 irs kit
« Reply #11 on: November 25, 2010, 11:16:54 AM »
If you go lower keep in mind your entry to your garage. I didn't and scrapped the header and exhaust clamps pulling in the first time. I installed new Try-Y headers and increased the exhaust from 2" to 2 1/2". This dropped the system low enough to cause the drag. I'm planning to raise the front back up about an inch to see if it clears. . . . .  8)

TheJ

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Re: 64-73 irs kit
« Reply #12 on: November 25, 2010, 12:22:27 PM »
yeah I actually want to go a little higher in the rear the front is just right.  its pretty close as it is because the entry is kinda steep.

Joe AZ 2 PA

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Re: 64-73 irs kit
« Reply #13 on: November 25, 2010, 05:17:23 PM »
Mine is steep also and I'm good if I have less than a 1/2 tank of gas and nobody in the car when I pull in or back out. The rear is already slightly higher with 15" wheels and 295-50's. I run 195-60 14" on the front with lowering coils. I'll be adding new 600lb. coils with a 1" spacers to the front this winter. . . . .  8)

TheJ

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Re: 64-73 irs kit
« Reply #14 on: November 25, 2010, 05:30:25 PM »
cool, I'm thinking of getting 15's front and rear but I'm not sure on the width yet. I don't know what type of suspension upgrades I want to get either.

Soaring

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Re: 64-73 irs kit
« Reply #15 on: November 26, 2010, 01:29:42 AM »
If you don't plan on racing it, just put on a new pair of rear springs.  I did that to mine and it raised the rear a lot.  The rear springs tend to sag after so many years.  A new set of KYB shocks also helps. 

TheJ

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Re: 64-73 irs kit
« Reply #16 on: November 26, 2010, 09:15:38 AM »
Are poly bushings worth the extra money?

Soaring

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Re: 64-73 irs kit
« Reply #17 on: November 26, 2010, 09:37:50 AM »
Most classic Mustang owners say they are. 

Joe AZ 2 PA

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Re: 64-73 irs kit
« Reply #18 on: November 26, 2010, 08:18:28 PM »
Most classic Mustang owners say they are.

I was told they are harder then stock and make noise cornering. I don't know if this is a fact or the installer didn't put them in correctly. Do you have them on yours? . . . . .  8)

Soaring

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Re: 64-73 irs kit
« Reply #19 on: November 26, 2010, 09:06:32 PM »
No, I don't because I don't race my '65.    But I have been moderating Mustang sites for several years now and this subject comes up often.  The one thing about polyurethane bushings is when you install the bushings, buy more of the special grease that comes with them, and grease the crap out of them before installation. Once installed, You'll never have to replace them again under normal use.  You won't have any squeaking, and you will have a solid suspension.  Keep in mind they are for racing situations, so if you don't race, then save the money and get rubber ones. 

 

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