Independent rear suspension

[Ralphy]

Is the IRS a multi link design, or is it a double wishbone? Multi link would be a bit complicated to set up. Plus limited slips, limited supply as you said.

Ralphy

[Tom Wells]

Earl,

What nevermind65 said...

I have done that to the Zephyr. It's great! First Coast Cobra Club • View topic - Zephyr dirty hands party Saturday 1-24-09

If the pickup points for the present rear are identical to the Mustang's, you're most of the way there; the Mustang IRS also uses the quad shock mounting points, so if those aren't present you'll need to figure out how to add them to the chassis. Also, the rear u-joint is different so that will need to change, but that's pretty easy...

The '99-'04 Mustang IRS was made to "bolt right in" to any Fox Mustang. Yeah, right...

BTW if you decide to do this swap, the '03-'04 differentials and axles are 31 spline, compared with the '99-'02's 28 spline.

Have fun!

Tom

[Luce]

I took matters into my own hands...

Lonestar Classics Forums • View topic - I'm in! LS 427 with home brew IRS

[cycleguy55]

Originally Posted by Ralphy

Is the IRS a multi link design, or is it a double wishbone? Multi link would be a bit complicated to set up. Plus limited slips, limited supply as you said.

Ralphy

It's multi-link - but all the link mount points are on the subframe, so if it's installed as an assembly all the setup is handled. As you can see in the diagram I posted earlier it has separate mounts for springs and shocks, but perhaps that can all be handled with a single mount by using coilovers.

As it turns out, it appears all the 6MT (6 speed manual transmission) models were equipped with viscous limited slip differentials. So, it would be best to look for 6MT rather than one with the 5 speed auto. If you go with the auto you'd need to track down an LSD - either OEM or aftermarket.

Thoughts?

[Rog246]

there is a bunch of Nissan stuff that is interchangeable from multiple models.
I used a Skyline GTS-T auto (R33) in mine and it came with LSD. The ratios available is quite wide, mine happens to 3.7 to 1 (a bit lucky) most seem to come with 4.11 gears which would be ok as I'm using Tremec 6speed box behind my 5.4 DOHC.
Think I'm going to pick up a 4.1 when I finally get mine on the road.
There are a lot on EBay if your thinking of looking.
Rog