You might like to read over this thread:

http://www.pro-touring.com/showthrea...ight=350z+rear

I personally wouldnt go to the hassle for the G8 (commodore) rear, IMO it's not enough of a performance upgrade to warrant the hassle. It's full of compromises for comfort/packaging etc.

But heck, if you want somthing different and you've got the skills to do it, go ahead!

Double post

the fixed length half shaft IRS versions appear to be based on the old Jaguar XJ6 type rear ends that were quite poor in terms of geometry. A live rear axle is "theoretically" very poor, but many people get them to work well.

I'm driving an old E38 bmw at the moment and the rear suspension of those is a slightly better compromise in terms of geometry than the Jaguar derived units is and it all comes on a cradle. I've no idea about the GTo stuff as we don't get them in the UK.

http://www.jcna.com/library/tech/images/tech0009b.jpg

JAG IRS, design is older than the 1st gen camaro stuff, but the v12 diff is very strong

"The Jaguar IRS is really a fine design, but has a flaw called "dreaded roll oversteer", caused by the action of the two trailing arms when the rear suspension compresses. As you are aware, the cage is mounted to the "frame" using molded rubber mounts, to allow the whole unit to move. It really moves about + or - 3/4 " if you snap out the clutch ! If you really watch this happen, you'll flip out! In a hard turn, the wheel on the side of the car whose suspension's being compressed, is forced rearward by the effective lengthening of that side's trailing arm, while the reverse is happening on the opposite side, pulling that wheel forward ! This, in effect, is rear wheel steering, without asking for it. "

Cobra into mustang swap here

http://forums.vintage-mustang.com/mo...-big-pics.html

Awsome home built suspension guide
http://www.beardmorebros.co.uk/websi...sion_page1.htm
http://www.beardmorebros.co.uk/Image...0rear%20on.jpg

I got the donor car in yesterday - It has an aftermarket intake, Corsa Exhaust, and some dynaspeed and hypertech stickers on the intake. Sound great - about 60,000 miles on it. I'm going to try to use as much of the G8 stuff as I can. I've got to check and see if it has some of the dynaspeed and hypertech stuff in it

I plan on starting on it in a about 2 weeks. I have to finish up a Bronco I'm building for a customer first.

Thanks for the Bronco compliment - I build Early Broncos(1966-1977) in my spare time. I have some better pics, but they were to large to upload.

IRS isn't that big of a mystery. I would use a 9" section and couplers/axles from Dutchman and use C5/C6 uprights and build your own control arms. Actually, I would probably build my own uprights too, but much easier to use Corvette parts. Not that big of a deal although kind of expensive.

The only mystery to me is you might get all the handling geometry right (in the computer obviously) but still end up with wheel hop or harmonic issues due to bushing compliance, resonance, etc. The OEM's can test and model that stuff out, but the home hobbyist might run into some gotchas.

ONe of my bigger regrets with the last car I built was that I didn't go IRS, but probably for the best. It was gonna add $4k to the cost of the car and at the time I was trying to be prudent.

thanks everybody, great advice. I think I am going to do the rear end closer to the end of the project. Still not sure about what I'm going to do - I need to figure wheel size, gear ratio, what back spacing I really want, etc.

What gear ratio are most LS cars running. I have the 6L80 automatic trans and I currently have a 373 posi under the car. The IRS on the G8 is suppose to be a 292.

Not to hijack- but if you're a Bronco fan, check out this '67 Bronco ;)

http://hotwheels.wikia.com/wiki/%2767_Ford_Bronco

Wasn't there a guy on here using a 04-06 GTO rear subframe?