As far as an IRS goes, I personally hope it has one. I've lived with live axles pretty much ever since I've been driving in the early 80s, I now have an IRS in my 04 GTO - and I say give me an IRS over a live axle any day. If you've lived with an IRS for any length of time, believe me - you CAN tell a BIG difference between the two - it's almost like night and day. If you live somewhere where all the roads are glass-smooth, maybe you'd be hard pressed to tell a difference. But most roads aren't glass-smooth, and having a car corner on a bumpy road and not feel like it's gonna slide out from under you is a very refreshing change. Folks who mod their cars are gonna decry having an IRS, but I don't mod my cars and I love the sure-footedness and much better ride quality of the IRS over a live axle - so my vote is for the IRS.
Hard to figure which way it might go. The 10 bolt would be fine for a 6cyl but won’t last behind 400hp V8. The IRS is great but seems a little too exotic to me for the Camaro. But if the IRS does stay, you’ll basically have the GTO drivetrain under the Camaro body. Not a bad deal really. I hope they keep the weight closer to 3400lbs rather than the 3700lb GTO. I’m sure the aftermarket or racing community will figure out how to put a solid axle back under it before long.
I say both have their good points and bad which depends on what the car is most used for. One drawback is you lose more HP going to the wheels with IRS other than that I think it can be set up to run well in the 1320
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