Within the first few weeks of introduction, there will be plenty of wrecked V2s to scavenge parts.
v1 to v2 rear cradle swap
There have been a lot of questions regrading the potential for retrofitting the improved 2009 CTS-V rear setup into our cars. I've spent the last few weeks researching the issue with a lot of help from some folks at GM (who shall remain nameless unless they say otherwise), and here's the final word- the following will be easier to understand if you have a working knowledge of the terminology of what's under your car:
Yes, it's possible.
No, it's not easy.
The biggest question (or so I thought) was whether the rear subframe cradle that everything attaches to would fit. It turns out that it will bolt right up, as the GMX322 chassis has the same cradle attachment points as our 320 chassis. This new cradle has all the correct provisions for holding the new rear diff in place, as it attaches to the cradle in a completely different way than our current one.
It turns out though, that this is the easy part. According the chassis engineers, our fuel tank will cause interference with the cradle, so we'd need to swap fuel tanks. Then the upper spring seats will not be in the correct location on our chassis, which means they would have to be moved. The unequal axle shafts from the 09 use a different spline configuration than our current ones, which means they won't mount to our 6 lug wheel hubs, so the hubs and rotors would also need to be changed to '09 pieces (as well as the wheels). There's also a new driveshaft in the 09 (Dana vs. GKN), so a new driveshaft is necesssary also.
So, to recap, it looks like you'd need the following:
-Rear cradle
-Fuel tank
-Differential
-Axles
-Hubs/rotors
-Wheels
-Driveshaft
-Modify upper spring seats
I suppose if one had a connection for cheap parts through GM, it could be done for about the same or less than the KARS cradle kit, and other than the spring seats, it would be a "bolt-on" modification (albeit a severe one). This would add not only the stronger rear diff, but cure the wheel hop as well, so I'm sure there's someone out there willing to try it next year when these parts become available to order.
Hopefully that answers the questions we've all had about doing this, and if there's anything I missed please feel free to shoot me a PM.
Yes, it's possible.
No, it's not easy.
The biggest question (or so I thought) was whether the rear subframe cradle that everything attaches to would fit. It turns out that it will bolt right up, as the GMX322 chassis has the same cradle attachment points as our 320 chassis. This new cradle has all the correct provisions for holding the new rear diff in place, as it attaches to the cradle in a completely different way than our current one.
It turns out though, that this is the easy part. According the chassis engineers, our fuel tank will cause interference with the cradle, so we'd need to swap fuel tanks. Then the upper spring seats will not be in the correct location on our chassis, which means they would have to be moved. The unequal axle shafts from the 09 use a different spline configuration than our current ones, which means they won't mount to our 6 lug wheel hubs, so the hubs and rotors would also need to be changed to '09 pieces (as well as the wheels). There's also a new driveshaft in the 09 (Dana vs. GKN), so a new driveshaft is necesssary also.
So, to recap, it looks like you'd need the following:
-Rear cradle
-Fuel tank
-Differential
-Axles
-Hubs/rotors
-Wheels
-Driveshaft
-Modify upper spring seats
I suppose if one had a connection for cheap parts through GM, it could be done for about the same or less than the KARS cradle kit, and other than the spring seats, it would be a "bolt-on" modification (albeit a severe one). This would add not only the stronger rear diff, but cure the wheel hop as well, so I'm sure there's someone out there willing to try it next year when these parts become available to order.
Hopefully that answers the questions we've all had about doing this, and if there's anything I missed please feel free to shoot me a PM.
21 - 40 of 156 Posts
:histeric:Within the first few weeks of introduction, there will be plenty of wrecked V2s to scavenge parts.
Maybe this could be adapted to fit in our cradle?Anything special about the size of the 5 lug pattern?
Ok, we all agree that our diff problems start with wheel hop, correct? Has anyone noticed that in all the write ups for the new V, they state that they know the problems of the current V and to help "REDUCE" and "MINIMIZE" the whell hop in the new V they are using different diameter shafts! Does this not strike anyone as odd that no write ups say it has been completely resolved? Has me wondering how much hop will be in the new one.....Guess we will have to wait and see.
It won't go away in a independant rear suspension with that much torque.
The attributes contribute to the problem.
If you want to improve it to the point where it goes away, you will almost certainly have to use a straight axel and stiff suspension and no limited slip.
In other words a straight line car.
On the other hand, Kars said his system virtually eliminated the hop.
The attributes contribute to the problem.
If you want to improve it to the point where it goes away, you will almost certainly have to use a straight axel and stiff suspension and no limited slip.
In other words a straight line car.
On the other hand, Kars said his system virtually eliminated the hop.
Plus, others have mentioned that MANY IRS cars display wheel hop including Porches.
Also, the more HP you add to the equation the more likely it's gonna happen.Plus, others have mentioned that MANY IRS cars display wheel hop including Porches.
Those magnetic shocks are looking good right now.........:suspense:
Let's see...
Pick up the G force from the computer and any other info, add an accelerometer, strain guages, and get some software and hardware together.
I would guess about $25k might cover it (less the shocks).
Those magnetic shocks ain't looking so good :thehand:
I need a beer...........:thumbsup:
wHY DO ALL OF THIS? Didnt you say the CTS-V doesnt have a diff problem? LOL... Just kidding!!! Doesnt seem like it would be that hard. Custom gas tank would be the tough part.
There have been a lot of questions regrading the potential for retrofitting the improved 2009 CTS-V rear setup into our cars. I've spent the last few weeks researching the issue with a lot of help from some folks at GM (who shall remain nameless unless they say otherwise), and here's the final word- the following will be easier to understand if you have a working knowledge of the terminology of what's under your car:
Yes, it's possible.
No, it's not easy.
The biggest question (or so I thought) was whether the rear subframe cradle that everything attaches to would fit. It turns out that it will bolt right up, as the GMX322 chassis has the same cradle attachment points as our 320 chassis. This new cradle has all the correct provisions for holding the new rear diff in place, as it attaches to the cradle in a completely different way than our current one.
It turns out though, that this is the easy part. According the chassis engineers, our fuel tank will cause interference with the cradle, so we'd need to swap fuel tanks. Then the upper spring seats will not be in the correct location on our chassis, which means they would have to be moved. The unequal axle shafts from the 09 use a different spline configuration than our current ones, which means they won't mount to our 6 lug wheel hubs, so the hubs and rotors would also need to be changed to '09 pieces (as well as the wheels). There's also a new driveshaft in the 09 (Dana vs. GKN), so a new driveshaft is necesssary also.
So, to recap, it looks like you'd need the following:
-Rear cradle
-Fuel tank
-Differential
-Axles
-Hubs/rotors
-Wheels
-Driveshaft
-Modify upper spring seats
I suppose if one had a connection for cheap parts through GM, it could be done for about the same or less than the KARS cradle kit, and other than the spring seats, it would be a "bolt-on" modification (albeit a severe one). This would add not only the stronger rear diff, but cure the wheel hop as well, so I'm sure there's someone out there willing to try it next year when these parts become available to order.
Hopefully that answers the questions we've all had about doing this, and if there's anything I missed please feel free to shoot me a PM.
I am starting to like Tony!!! I GUARANTEE someone will do this. It won't be me but as our cars get older and out of warranty, it will happen. Awesome post Tony. :thumbsup:
Why are we focusing on the V2 parts? Has the 2008 cts not been revised? i am sure there are plenty of those available wrecked now.
:wtf2:Why are we focusing on the V2 parts? Has the 2008 cts not been revised? i am sure there are plenty of those available wrecked now.
he must be having a brain fart:wtf2:
This suggestion still has some merrit.Why are we focusing on the V2 parts? Has the 2008 cts not been revised? i am sure there are plenty of those available wrecked now.
At least the cradle and gas tank could be the same.
CTS-2 diff would not be cast iron though.
Probably still stronger than V1 diff.
If the CTS-2 has stronger splines too, then that makes 2 good reasons for doing it.
The cast iron diff could always be put in later, if needed.
Obviously if you have big power then there is no option but to wait for the V2 parts.
With low mods, this might be a good low cost upgrade w/ cheap CTS-2 parts.
Some enterprising Caddy dealership with a guy that specializes in selling mods to V owners should put a package together for retrofitting our cars with all the necessary components/mods to do this. Would be a real feather in his cap.
Any suggestions?
Any suggestions?
Damn what was that guys name???.......................hmmmmmmmmm
Quite frankly guys, my specialty is cars- both product knowledge and getting you a fair price on one. My sponsorship of the forum is personal, so my Parts and Service Department aren't involved. If anyone is going to put together a package for this retrofit it will be Luke and James, the fine fellows at Lindsay Cadillac.
My interest in finding this out is both personal and helping out fellow V owners, and if there's anyone qualified to take this info and run with it, it's those guys. :thumbsup:
My interest in finding this out is both personal and helping out fellow V owners, and if there's anyone qualified to take this info and run with it, it's those guys. :thumbsup:
Well, out of the two guys I was thinking about, one has just nominated the other.
Tony, can't say it enough ... thank you, thank you, thank you for looking into the feasibility of doing this. :highfive:
Tony, can't say it enough ... thank you, thank you, thank you for looking into the feasibility of doing this. :highfive:
How about we have a raffle and the winner gets this upgrade done at Lindsay.
That will then pave the way for others to get their cars upgraded after.
That will then pave the way for others to get their cars upgraded after.
21 - 40 of 156 Posts
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