WANTED: 03/04 IRS

[Tabres]

Kicking around the idea of going IRS. Looking for a 03/04 unit. Upgraded axles and bushings would be a big plus.

Located in central IL and would prefer to not mess with shipping.

Could work out some form of a trade on a fully built solid axle. Has a 03/04 diff, 31 spline axles, 3.55 gears, TA diff dover, Maximum Motorsports coil-overs, lower control arms, panhard bar and torque arm.

 

[fivelitrecobra]

Just a question, are there any differences between the 99-01 IRS and 03-04 IRS?

 

[Tabres]

There are differences, yes. It is mostly a lot of little things that add up. There are even some difference between 99 and 01 IRS types.

Predominantly though it is gear ratios, stronger differentials, stronger halfshafts, mounting differences on the diff case, bushing material/durability and so on.

It's old, but there is an incredible tech article from about 15 years ago:

The IRS Tech Article

I. Preface Here are my thoughts on the IRS. This is based on all information I have been able to collect on the 1999 - 2004 Mustang Cobra Independent Rear Suspension (or IRS for short). I know this is a lengthy read but it is well worth the time as it is intended to answer all technical...

www.svtperformance.com

 

[Tabres]

Bump. Still looking.

 

[wildturkey]

I have an 01 Cobra IRS, 31 spline, 3.55 gears, upgraded poly bushings, axle gridle, Spec D Tokico adjustable shocks, a set H&R 51659 front and rear springs and probably much that I didn't cover. Just a few hours away in southeast Missouri. You can call me and I'll send you some pics if you are interested. Muy dinero has been invested into this setup and it held up to over 700 RWHP

Read ya Later, Nick