: Gto rear end on ctsv?

07-20-13, 01:35 AM
I'm new to the ctsv world but know the LS2 gto. So why didn't gm use the gto IRS on the ctsv? The wheel hop issue was known on the gtos as well but we just used drag bags from speed inc and all was well. So why didn't gm just use a pretty proven rear on this car? Why do ctsv rears (diffs) grenade under wheel hop? That wasn't a known issue with the gtos just the axles spinning under 400+ rwhp. I'm not trying to bag on the ctsv I really like this car.

07-20-13, 09:02 AM
There are many reasons why they didn't use the Holden rear diff, most likely because they were designed by different engineers. You can put drag bags on the stock CTS-V rear springs. The V diff grenades because it over-angulates the pinion CV and the weakest part is the snout casing so it rips it off.

07-20-13, 11:30 AM
b/c the sigma platform wasnt designed for the V series, the V1 was an after thought. old school mentality, throw a big motor in there and some high dollar shocks and let her rip. who cares if the diff fails, we will only sell 9,000 units and the cost of putting in a diff in the sigma that can handle the power will cost more than the warranty claims..

07-20-13, 12:16 PM
Wow didnt know this. Is this really common? Might turn me away from getting one

07-20-13, 12:18 PM
I have a cradle sitting in my garage I had dreams of mating to a Holden/Holder rear diff.

Been there for at least three years.

08-01-13, 11:07 AM
In all honesty, some V1s will grenade under a light load (daily driving), others will blow up when they are beaten on, then you
have some that just take the abuse and don't break. I don't drag race my car, however, I get after it in my 05 V, and all I have
are delrin cradle bushings right now. With that being said, ***knocks on wood***, I have yet to break it, my last V was the
same case, it never broke. I also came from an 03 Cobra, which wheel hop was a more common occurrence than a V, so I'm used to just feeling when the car just feels like it's not going to lay the tires down, so I let out of it and continue on, others just
hammer it and hope for the best.

I've been torn whether to keep my V1, upgrade to a V2, or pick up a 94 Supra with a 65mm turbo, and every time I come out to this car, I just can't get rid of it, no other car has kept me hooked like this. Test drive one and see how you like the feel of it. It's lighter than the GTO, handles better imo, and looks a hell of a lot better.

08-01-13, 01:43 PM
Just get a 9" Gforce and be done with it.

08-01-13, 06:26 PM
^or a CS 8.8 set up

08-01-13, 06:37 PM
Excuse me, Harrop is the race parts builder.


08-03-13, 03:41 AM
V1 diffs will not grenade under DD conditions. Bring in wheelhop and it will...

08-07-13, 12:06 PM
Wow didnt know this. Is this really common? Might turn me away from getting one

As opposed to what? An M3 or S4 or C63 that requires you to take a second mortgage out on your house to get stuff for... I remember my buddy at work had this SN95 stang sitting in his garage... But he took out his C63 instead to show off and was doing burnouts and blew the trans... Warranty wouldn't cover it so he was out like $6k (if memory serves) for a bone stock trans. I'll stick with my american made stuff thanks. If you spent $6k on an auto or manual in a GM car, it would be indestructible. Really the rear end isn't that big of a deal. $4k and it will NEVER break again, granted it IS a Ford rear end but they are darn good... I'm going to keep my V for a long ass time so its worth it to me.

I was looking at the B7 RS4 and the V when I ended up getting the V. People are still getting nearly $35-40k for some of the B7s RS4s. I mean shit, for that price difference you could have the more expensive ford9 rear end, rebuild the motor, upgrade the trans, clutch, all the mounts/bushings, and toss on a supercharger... If you can handle some of the labor yourself.