IRS -- hop, hop, hop! Best fix? - Ford Mustang Forums : Mustang Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 04-28-2002, 01:07 PM Thread Starter
Trader Feedback: (0)
Join Date: Apr 2002
Posts: 174
IRS -- hop, hop, hop! Best fix?

I've seen plenty of discussion on the IRS hop. So here's my question? Is there a conensus on the best fix?

My '99 won't see much strip duty, and when it does it'll be street tires most likely. Replacing with IRS with a live axle is not an option, I have really grown to like the way the IRS handles on the rough roads around here.

I've heard that the IRS only hops when you lose traction -- true? I just bought this car with 13k miles on it, and it still has the factory Comp T/A's on it. Yuck. I'm thinking new tires will help, but my '98 will happily roast the RE730's, so I'm guessing traction will still be a problem on the '99, especially when I get the 4.11's installed.

Suggestions please! I want to do this car right.

ToplessCobra is offline  
Sponsored Links
post #2 of 3 Old 04-28-2002, 02:12 PM
Registered User
Trader Feedback: (0)
Join Date: Dec 2001
Location: West L.A., CA
Posts: 1,320
I'm interested in this one as well, so I'm subscribing. I've heard that good bushings go a long way on these cars. I'd be a little hesitant to try them in my current state, especially with the vibration the way it is. Harder bushings only increase the transmission of axle vibrations through the chassis that much better.

2016 GT, Perf/Prem, ruby red.
99 Cobra ebony, blk int. #1762/4040
86GT, 88LX 5.0, 95GT
ctfren ch @ iClo ud. n e t (remove spaces)
lo pony is offline  
post #3 of 3 Old 04-28-2002, 02:47 PM
Trader Feedback: (0)
Join Date: Oct 2000
Posts: 194
Well the best thing is to go live axle (thought I would say that before any one else )

But there are a few things you can do to help with the wheel hop.
1) Replace the bushings Steeda

2) Add a IRS Pinion Support Brace (second picture down)

3) Replace the springs. I have heard that replacing the springs with a higher tension rating will keep the tires from hopping as well. This is do to greater down force on the tires.

I myself have H&R super sport springs. I do not have them on yet but one of my friends here in KC (Angus) has the Bushings and the Sport brace along with Steeda springs he has 4.10 rearend and not all that much wheel hop. He is pushing out right at 300hp and 300lb of TQ at the wheels. The hop might increase with the more power you get to the ground. In this case you might want to look into the GKN Stage three shafts. The more wheel hop the more likely you are to break one..

Hope this helps
99cobra is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forums : Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Upgraded the Cobra IRS with Poly subframe, control arm bushings and more cobraracer46 SVT & DOHC 10 02-18-2013 07:15 PM
For Sale 99-04 Cobra irs stop the hop kit Turbo99svt Suspension 1 03-09-2010 05:33 PM
99 + IRS Cobras - CLUNKS & THUDS fix?? StorminNorm GT & SOHC 2 04-12-2002 12:05 AM
Wheel Hop Fix 01ConvCobra GT & SOHC 25 02-27-2002 10:57 PM
Cobra IRS wheel hop BIZZYB0NES GT & SOHC 7 02-09-2002 07:37 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome