0TJ@RPMtransmissions

Gary04Z06 has tons of passes on his stick Z06 with sixty foots in the 1.30's and 1.40's... he has never broken a DSS shaft.

I have probably 40-50 passes on my diff with DSS shafts and sixtys in the 1.40's with no issue... I know I beat my car pretty hard and it makes over 560 at the wheels.

Are you sure you had DSS shafts in the diff, and if so how long ago was this?

Stage IT

oh i'm as positive as it gets. it was in 08. my friend had the same issue with his around the same time. he lost so many he went auto and i sold my car (6 breaks in a year). my car bolt on lS3,410rwhp with 1.6 60fts, his car HCI ls2 460rwhp. I tryed both m&H dr then bias ET streets to soften the blow on launch. i Figured the way they were breaking that DSS was harding them too much and making them brittle, esp. having never broke the stocker. just to clarify im not talking DSS halfshafts, but there short intermitent shaft. Also why would you be running the DSS shafts when you have your own?

Stage IT

oh stock clutch on mine too....which makes me leary on which one to buy for my Z that needs a clutch

0TJ@RPMtransmissions

I am talking about the stub shafts inside the differential. We used Gforce until they quit making them. In late 07 early 08 is when we made the change to DSS, they have had 3 different versions. The first sets were strong but we did have a few break. The second versions were much stronger and saw very few break, with the newest version that we have used for over a year. I have only seen one break.

Stage IT

just curious what did they change each time? was it the hardening process or materials? like i had mentioned i have a hunch they were over hardening them making them brittle . my time frame goes right with their first design then as we were using them at the end of the last season and start of the new in 08

JUIC3D

Here's a great website for this stuff

http://xse.com/leres/bin/gearratio?t...rofile=&wheel=

0TJ@RPMtransmissions

They changed the shaft design on the first change, then they made a material change on the next change.

GARY2004Z06

We can personally attest to the rear that RPM Transmissions has built. This rear has been in the car for 1 1/2 years. For those who may not know, the car is street driven as well as drag raced in the Corvette Challenge series and for ET. We have put on +/- 150 passes without failure. Each type of racing puts different stresses on the drivetrain components. We dump the clutch at 2500 rpm in the Corvette Challenge bracket and pro 11.50 series. It generally deadhooks which is a substantial load and produces sixties normally in the 1.6 to 1.8 range. When chasing ET, we launch the car well above what many would feel comfortable doing, +6,000 rpm, and have produced (8) 1.3s, (9) 1.4s, and (22) 1.5s on a combination of DRs and slicks. I cannot state that a rear is unbreakable for our IRS cars; however, I can unequivocally state that this rear is by far the best rear that we have installed in our car and the results have been nothing short of outstanding. The gentlemen at RPM Transmissions know their stuff and are great to deal with.

1bigcam

Wish i had that luck mine was a 06 up case with all the z06 parts and 3.90 gears and i cracked the case with 400whp same car before the fast and headers broke a c6z pinion surport and stock output shaft of the trans, iam not easy on parts but not a retard also anyway hope some 3.90s come available soon lol

RWE 427

My thoughts exactly....

JUIC3D

I don't have Gary's resume for launches but I have a handful of 1.5 60 fts and a single 1.48 60ft on stock rear and stock clutch without breaking anything. I now have a Mantic twin disk and built 3.90 rear end so hopefully my string of luck continues.

I think a lot has to do with driver and the ability to modulate the throttle/clutch without the aggressive shock that a side-step induces.

Just my $.02

ajw2500hd

c6 rear in my z06 would last maybe 3 passes lmao

GARY2004Z06

gtodoug

How much to put a 3.90 set in a C6z?

0TJ@RPMtransmissions

Our standard stage 3 diff is $2995.00 exchange. They are build from 100% new components. The stage 4 which includes the quaife torque biasing differential is $3495.00 exchange.

double06

I wish somebody would just make the gears and we would not have
to go through all of this nonsense but i understand cost demand etc.an

JoesC5

Awhile back, one of our forum members looked into getting some 3.90's and 4.10's made. I think he had to pruchase 100 sets of each. After asking who would be interested in a set, he dropped the project. I guess he wasn't willing to put up a bunch of his money and have them sitting around in his garage waiting for customers.

JUIC3D

From what I understand, it's not a matter of someone not being able ot make them--its a matter of logistics. With the additional guts present in the C6Z and ZR1 diffs, there isn't room for a larger ring gear and thats why the guts are completely removed and replaced with a C6 if a Z or ZR1 owner wants a diff ratio.

I could be wrong though

JoesC5

The Z06 and ZR1 already have the larger diameter ring gear. A new set of gears doesn't increase the size of the gears, just changes the number of teeth on the gears. The base C6 uses a smaller diameter ring gear, which is weaker.

jdhommert

I have to say i'm suprised some company somewhere doesn't offer them