Well was racing the car and was on my last pass 2nite, I launched the car off the 2step went to speed shift to 2nd gear and nothing but rev limiter. So I coasted the car down the back strech, I can put the car in all the gears WITHOUT using the clutch and im feeling and hearing a pulsing clunk when the car is in gear clutch engaged. The car will not move and if I rev it in gear I get no response from the speedo just the pulsing clunk picks up pace.

As for mods the car is n/a with a forged ls6 making 463whp/418wtq. Driveline wise I have the LPE hardened long axle shaft, ecs rear brace, centerforce df 12" clutch. The car is a 2001 c5z06.

Any guesses at what it could be?

 

Yeah that sucks. It sounds familiar. Chances are when you pull the trans you might find something like this. Then call RPM transmissions for an upgraded mainshaft.

 

Did it take the rear end with it?? How hard was the mainshaft replacement??

Just makes me wondering if its the Main shaft or the Torque tube how the car is making the pulsing knocking sound when running in gear. The noise gets louder the deep the gear the car is placed in. If its in first you can barely hear it of the b&B bullets w/ Off-road Xpipe. But if you put it in 4th or 5th its pretty damn loud! Almost like a spun main bearing engine sound.

 

You are going to have to put it on jack stands and get under there. Turn the rear wheels and see what happens with the input shaft to the transmission. That'll instantly break things down in half as such as to where to look.

 

In my case the diff was fine. There were some extra metal debris to clean, due to me spinning in gear and wondering what I broke.

Here's a video I took, sound familiar?

 

Mine was way louder than your video, and I could put it in any gear, with the clutch in, but as soon as I started to ease the clutch out, the car will jerk, buck, and clank loudly, but it does move.

 

mine taked the rearend out with it too

 

I would agree with Chris Stewart that it's the main output shaft. I see too many of the output shafts break where it contacts the pinion gear splines. The output shaft splines start to "roll over" and over time, that is the starting point of the stress riser. I have seen this only on cars that run 1/4 mile with sticky tires.

 

Well I did some more diggin around 2nite as I unloaded the car from the car trailer and the clunking noise from mine is exactly like chris's! BUT put the car up on blocks and was able to crawl underneath with it running and had a friend put it in gear. The clunking and bumping was coming from where the rear bell housing where the Trans meets the torque tube. You can feel it pulsing and clunking right where the Bell housing of the Torque tube starts to narrow down to the tube itself.

As a final question how does the car make the pulsating clunk if the main shaft that goes into the diff is twisted off?? Shouldn't the car just free spin and be a PITA to push around as material in the diff would be holding up the ring gear and pinon when turning the rear tires??

Chris when yours broke was the clunking louder the deeper the gear your put the car in?? And barely audible in first gear??
Did yours break at the front of the trans??


As for cars only breaking with sticky tires I'm running a set of Toyo RA1 305/35/18's had 22psi of air in them when HOT. And this wasnt a prep'd Drag Strip, just and event held by our local AutoX track, running down the back stretch. probly only 660' from starting line to finish.


So what does anyone think the cost to fix something like this would be?? (Torque tube failure vs Mainshaft failure vs Trans/Diff Destruction!)

 

sounds to me like you broke the rear TT coupler. I've killed the front one a couple of times.

 

What kind of symptoms did you have when you killed one of the fronts??




Are you able to swap a 2008 C6 Torque Tube and Trans into a C5 with a C5Z rear diff??

 

Your best bet is to remove the drivetrain and see what the damage is. You'll have a better accessment of the cost if you know exactly what you need to repair. If you broke the main output shaft, I can send you a quote for just replacing the shaft.

You cannot used C6 torque tubes on C5 cars. The length is different.

 

Hoping to have the car taken apart in the next month or so. I'm currently involved in closing on a house and wedding cost. Since I'm sure my fiance wouldn't appreciate the heart breaking news of the cars taking over part of the wedding cash, and really don't want to have everything torn apart before the move to the new place, or sitting around in boxes waiting for enough funds to fix it.

 

Since it's an '01, it'll have the aluminum shift forks, and other parts I'm not sure of, that should be updated/strengthened at the same time. Rick'll know.

 

Had the trans rebuilt about 7k miles ago (2 years ago) and had steel forks installed as well as all new carbon fiber blocker rings and the triple cone syncros, basicly to 06 gto t56 mn12 specs

 

subscribed for future ref

 

I have similar problem on my 2003 Z06. Turned a corner then suddenly car would not go in any gear. Put it up on stands. If I put the car in gear I could turn the right tire freely. The left can't and can hear engaged in the transmission. No visible breaks on the half shafts while installed.

 

Strange. So many breaking?
Cant post pic from iphone.what if I back down the boost ?16 might be to much?
I run the proxi 335/30/18 ,they hook like crazy.
Afraid of what else will break.I have replaced most everything.Dred a trans.I would like to know the PN's of the replacement parts.

Mike

 

Listen to Rick! Sounds like you broke the tranny main shaft.

Man,, your in for a NEGATIVE CASH FLOW TSUNAMI

Drive train removal usually results in:

Clutch UPGRADE (including pilot bearing, throw out bearing, slave cyl and remote bleeder. )

Remove disassemble and repair the torque tube bearings, bushings

Differential C6 ZO6 UP GRADES See the following POST:

- C5, ragtopws6 , Upgrading your C5 rear with C6 Z06 guts, : http://forums.corvetteforum.com/c5-g...-z06-guts.html


- C5, Its_Go_Time, Output Shaft Install - Left and Right: http://forums.corvetteforum.com/c5-t...post1573407966


And a tranny post:

- C5 ragtopws6, T-56 Build (whats in my tranny?) : http://forums.corvetteforum.com/nort...-smoother.html

Then your going to want a ECS Brace!

Give Rick your tranny and credit card! He will make it better!!!!!!!!!!!!!!!!!!

I just did all this! In fact, I am installing a TRANSZILLA MN12 T-60/60 conversion tranny and a Spec Duel disk clutch. with all the stuff recommended above.

Should be done by Monday if all goes per plan. Murphy has been on my back lately!! I assembled the bell housing to the engine and found out it was CRACKED! Two steps forward and one step back

I did install the flywheel that I had balanced matched to the old fly wheel and started and ran the engine up to 6850 rpms. Murphy must have been on vacation. NO VIBRATIONS!!!!!!!



Bill

 

For those who are interested to know. The car broke the Main shaft



I will be upgrading the car with:
T56- 30Spline Main Shaft
3.90 Gear set
C6Z06 Short Shaft
Re Using my 300m Left Shaft
C6Z06 Pinon Support
HD Carbon Clutch Pak and HD Preload Springs

Reusing my 8000k Mile Centerforce DF 12" Clutch and Flywheel setup
Installing New C5Z Torque Tube Bushings
Reusing my ECS Diff Brace
Switching for B&B bullets to Borla Stingers
Installing NEW Walbro 255lph pump


I'm hoping to have the trans/diff shipped of tomorrow morning. Can Anyone think of anything I'm missing for a 625whp capable driveline??