Well said, Andy.

Also, I'm not sure why we're not seeing any GS breaking rears or transmissions; they've been around since about 7/09, over a year since the '10 models came out. Maybe they're not racing...

 

supercharged ? nice gain.

I think you should consider an upgraded diff + a diff brace asap

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for the GS, never seen one here in Gulf region and don't see many racing with it yet, even if they did with the stock tires, they will not break the diff

I think the rear end /cltuch/etc will face a failure or issues when the tires get a real grip but for the stock tires, any stock corvette ls3 can spin a lot from dif or 40km roll ( in most of the streets)

 

I'm planning to upgrade mine as well...I was hoping to go with a Z06 diff, but I guess it's not going to mate to the C6 trans.

Now what do ya do? Is there just some internals that need upgrading, that you could swap out?

 

They have some supports for the case to prevent breaking, I've not reviewed the whole thread, but there is a vendor (DTE) who supplies these types of mod parts. Maybe someone will chime in with more details. Thanks!

 

I just had a DTE (Phil) perform a stage II transmission rebuild and stage II rear diff. rebuild just about three weeks ago. Luckily Fort Wayne isn't that far from Louisville KY so I trailered the vette up there and had them perform all of the work. It was all over my head anyway.

I just finished my engine build on my `05 Z51, heads(TEA stage II), cam, tune (Jeff Creech), CAI...already had complete exhaust. Just after about three weeks after the build, still in break in period, I broke something in the drive train. Researched this forum and found out about the nightmares associated with the `05 rear diffs. Well, it turns out I broke the transmission output shaft so I had to have a tranny rebuild too. I did go with the Z06 30 spline output shaft, and since the diff was getting rebuilt as well I had them install the 3.73 polished gears along with the Z06 output shafts (part of the stage II build). What made this rebuild cost more than typical is that I also had DTE change out the casing to a `07, side covers and adapter plate. These guys know drivetrains and rear differenials. With the engine HP increased it was only a matter of time before I thrashed the rear diff anyhow being a `05 car. GM should have recall this car for the weak *** rear diff., but that's another discussion.

I just recently finished my drivetrain break in period and I'm finally getting to really have some fun with this car. I'm blown away with the acceleration of this car. Hands down the fastest car I've ever owned or driven for that matter.

Heading to the dyno soon to get my final tune and see what this engine puts out.

ps...sorry to hear about your luck...drivetrains aren't cheap by any measure. With the engine build & complete drivetrain I'm around the 10 grand mark....but worth it!

 

I'm not sure.....

I guess I can't say I've seen too many GS models that were highly modified yet. Since they have only been out a year, probably a lot of owners are still keeping them stock. I think it will become more of a problem in a few years when prices on used 2010 GSs come down and people start buying used with performance and mods in mind (like me and my '08 Z51).

 

I seriously don't think that brace will be much help.

 

my blown diff in my 05 looked the same, except it ended up sitting on top of the rear end housing, I was also already in 2nd gear on a full throttle pull, 443 rwhp c6 6 speed

 

Does anyone know what's breaking on these differentials? And what was upgraded from '05 to '06?

I have an '06, but I'm a little unsure if I should trust it taking my planned 500 rwhp. So I've been kind of holding off on the H/C mod until I get some more information on these drive train issues.

Maybe for now I'll just do my clutch upgrade, and do the diff. mods when I go to bigger wheels and tires. Right now I'm only running NT05 275/35/19, so maybe that's not enough traction to cause any issues??

 

GM changed the design in 2006 or 2007 because the 2005 & some 2006's were breaking under normal use. As usual, GM went with a "cheaper" design to save money but soon found out that the 400HP of the LS2 was no match for the differential. So Getrag came out with a stronger design for GM, I believe it was referred to as the "3-series, second-design"

GM learned its lesson, so when they came out with the Z06, they put in an even heavier duty differential to protect themselves from warranty claims.


Visit Dynotech :

http://www.dynotech-eng.com/dte_c6_diff.htm

 

what do you think of adding the diff brace + PFADT engine & tranny mounts to be more on safe side or atleast you will feel more confortable?

Pfadt C6 Engine Mount Kit
does it really help that much?


btw, im buying a used 08 z06 diff + tranny

I will let you with the progress later.
Thank you all for adding value to the thread.

 

ttt
electric pump

 

I have successfully installed a 08 z06 differntial and tranny into my c6.

the torque tube of the c6 fits perfectly the tranny of z06. I only need some z06 cooler hoses to be purchased and complete the whole story.

here are some new pcitures for the blown diff and the z06 diff:













hope everything will run smooth on this used z06 tranny. it has only 6k miles.

Thanks all

 

Thanks for the pics and info. That's what I'll be doing when mine goes out. If you reused your torque tube, does that mean you didn't have to swap the transmission? The Z06 rear end is a direct replacement?

 

^
^
Yes I have reused the c6 torque tube with the z06 transmission, no problem at this side.
BUT I'm not sure if the z06 differential alone will fit to the c6 tranny, I really doubt that.

but for me, I installed the z06 "diif + tranny" combo and it fit perfectly with c6 torque tube.

I onle need to buy two pipes for the tranny/diff cooler to complete the install and run the car.

missing GM parts No:
part#10346305
part#15254972

 

This illustrates the folly of building differential cases out of aluminum. They should be built of cast iron, which is over 2x stronger, and much cheaper. True, there'd be a weight penalty, but it would be at the rear. I know the engineers want to eliminate every pound they can, but sometimes it comes at a cost, as in the failure of this differential case. The '05s apparently suffered case failures, so they beefed them up for '06, but still used aluminum. Aluminum is OK for econo box cars, but "iffy" in HP cars such as Vettes and Vipers when used in high-stress components.

 

I don't think the engineers had much drag racing in mind for our cars, it's a balanced car for really good all around use

Road Racing is where the Corvette is usually doing it's best work

 

rarely see a diff blow up like this in a 08+..

good luck!

 

I like the look of that exhaust, who makes it?

 

A DTE tranny/differential brace will, in no way, help reinforce the differential case. All it does is prevent a differential failure from damaging the tranny.
The cases in the '05 C6's are especially prone to failure. Just like GM to put an additional 50 hp and torque into the C6, then save $5 in material by designing the cases thinner. GM realized they had an issue in the 11th hour of the introduction of the C6. They fixed the problem is a software modification called "torque management". All 6mn 2005's had this software change. I'm not sure about newer models, as GM did begin using better differentials in 2006.
All torque management did was retard timing and change the fuel mapping so that the 2005's only made about 330 hp in 1st and 2nd gears.
What a load of GM Bull$h!t.