1999Firehawkls1

Well this winter we upgraded to Driveline and thought it was enough................WRONG!!!

Ls2 w a Custom Grind Cam is under the Hood, 425whp/400Ft Lbs

We put a new McCloud RXT Twin Disc in (Which is hands down a Bad ****!!!!)

ECS Trans Brace

Pfat Rear End Mount

Hinson Super Cars Motor Mounts

AND a set of Nitto 555Rs.....

Went to Indy for the Vette shoot out just to run it twice to try for an 11 Flat and First Pass I think Cracked it and the 2nd time in the Burn Out Box the Diff Case cracked right where the Bolt Threads into the rear diff at thru the Pfat Rear End mount......crack continued down from there

Kick A$$ Clutch+ Nitto Drag Radials....= No GO!!!

nullpointer

You cracked it in the burnout box? I've heard of cracking it while launching, but never in the burnout box. Did you get the tires a bit wet before dumping the clutch for the burnout?

1999Firehawkls1

Yea I got them in the water before the burn out.....duno it wheel hopped a bit in the first pass and that prob cracked it a bit and then in the Burn out Box finished it off is what im guessing....

nullpointer

Sucks, good luck with the rebuild. I've had to rip apart the diff twice, isn't fun.

1999Firehawkls1

Thanks! I just put the driveline back in it a month ago w the clutch and braces too..

sabastian458

Can you post pictures of the failure point?

1999Firehawkls1

I can after this wk end when I get out to the shop

c5zee

I see a c6 diff in your future :o

1999Firehawkls1

Here is the nice view of the damage everyone has been wanting to see. Drag Radials Won this round....

4XLR8N

Bummer...

Unfortunately, racing = broken parts...and more HP = more broken parts.

It's just part of the game and the main reason I don't race. It IS a ton of fun, though...

Good luck with repairs!

quickc5zo6

Damn how bad did you wheel hop?

What did you run on your firat pass?

zeevette

It only takes one hop, if it's stressful enough. I broke one hitting third gear hard. Good luck with the fix. I went with a built diff. by Rick@ RKT56.com.

MY03C5Z

This is why I dont like to run mine at the strip, only ran it once so far. Ran my 97 LT1 z hundreds of times, loved racing that car. It was set up to handle the 1/4 though, HD torque arm, strong clutch, 12 bolt etc. That car could take a beating at the track and never broke anything.

PhiL02Z06

Scary! Wow! It's discouraging to see how weak the C5 driveline is,

1999Firehawkls1

Spun 1st, hopped a bit in 2nd, w a 2.6 60ft we ran a 12.2@120.9mph

Cars been 11.44@124mph (Ran by previous owner) w the old on it's way out Ls7 Clutch, just finished putting a McCloud RXT in this winter.

I was only gonna run the car that day for funny and be done w track driven it, I put on the ECS Trans brace and the Pfadt Rear mount at the time of the RXT install to prevent this from happening..... No more 1320 time for this car ever again! It was bought for a fun street car and will stay that way.

racebum

dude, that's some good carnage

1999Firehawkls1

Think we can JB Weld it?!?!? Lol

MY03C5Z

Looked up that clutch, didnt know much about it. From the looks of it, solid unsprung hub designed to hold 1000hp Id say that was the main problem for your transaxle. That thing sounds like a beastly clutch!

racebum

you ever drive one of those? they are ridiculous in engagement if they use a high friction material on the disc. transmit a lot of driveline shock

the torque tube couplers are what would worry me, if the shock is enough to break cases like that the couplers are getting raped dry

malibu78

I broke my case output shaft in trans and ate the ls9 clutch. Power shifted into 2nd and kabooy. Sounds like the car was previously owned just like mine. I am willing to bet there were a few banzai runs with severe wheel hop that weakened the drivetrain. If they wheel hop all the time it's not if but when it will break no matter how strong the parts