UnsafeAtAnySpd Posted September 21, 2010 Posted September 21, 2010 I did search before asking this, but most of what I found didn't apply directly. Anyway, I have an '04 CTS-V which is notorious for having a horrible rear end. Finally, there looks to be an 'affordable' solution to the problem that uses a 9" rear in the stock cradle. Basically, if I were to pick one of these up, what points would I take? I'd basically be doing it as I drive the car on the street and the stock rear can't handle stock power. The closest thing I see in the rules is this: 32) Changed or modified limited slip differential (or welded/locked OEM LSD) +1 along with this tech bulletin: No-Points Modifications17) Motor, Transmission, and Differential mounts and inserts/bushings replacement/upgrade or modification (with up to 1 inch of relocation of the motor/transmission)and exhaust piping external wrapping and I suppose info about the driveshaft from this thread as well as that will need to be changed to accommodate: viewtopic.php?f=2&t=36735&p=270160&hilit=driveshaft#p270160 Or is it not allowed being that this situation isn't explicitly allowed in the rules? Thanks. Quote
MSP608 Posted September 21, 2010 Posted September 21, 2010 Is this coming out of an 04-07 CTS-V, or a different vehicle all together? Quote
Varkwso Posted September 22, 2010 Posted September 22, 2010 Most it should be is +3 (31). Send a email to Greg Greenbaum Quote
TurboShortBus Posted September 22, 2010 Posted September 22, 2010 1. Does the car come with an open differential or a limited slip-style differential in its base trim? I would assume some sort of LSD, but I can't say for sure from here. 2. Is the proposed differential open or limited-slip style? Mark Quote
UnsafeAtAnySpd Posted September 23, 2010 Author Posted September 23, 2010 The diff is out of a different vehicle. I'll shoot an email soon. Both the stock and swapped diff are LSD. Thanks for the replies. Quote
TurboShortBus Posted September 23, 2010 Posted September 23, 2010 My interpretation is that it would be +1 per Engine/Drivetrain #32, as long as the base vehicle (as listed in the TT rules) also came with a limited slip differential (in other words, it wasn't an option on the base vehicle). Per this item, you could also install a $1500 Quaife differential in your car for the same +1 if the base vehicle already came with an LSD. The final drive ratio is "free" per No-Points Modification #9, if that would apply to you. Either way, please keep us posted on the official response. Mark Quote
Varkwso Posted September 23, 2010 Posted September 23, 2010 My interpretation is that it would be +1 per Engine/Drivetrain #32, as long as the base vehicle (as listed in the TT rules) also came with a limited slip differential (in other words, it wasn't an option on the base vehicle). Per this item, you could also install a $1500 Quaife differential in your car for the same +1 if the base vehicle already came with an LSD. The final drive ratio is "free" per No-Points Modification #9, if that would apply to you. Either way, please keep us posted on the official response. Mark I tend to agree - A 9 inch, 12 bolt, S60 or Dana swap are pretty common in american V8 cars. Looking for a 2005 CTS-V myself.... Quote
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