This thing will not shift at high rpms. shifts clunky like a grain truck. 4th grinds hard under acceration going in. put a tick master on it. same thing. has the b@m ripper with the washer mod done on tranny. Is the tranny just hammered?

 

Before you get too deep into repairs,,,try changing the trans fluid. If its dirty, fresh fluid sometimes makes a world of difference. It did on my 98 coupe with 50K miles.

Get a quality synthetic ATF and do a drain and fill and see if that helps.

Bill

 

change your clutch fluid

 

Try bleeding the clutch really good. Did you replace the slave? Beyond that the transmission may just need to rebuilt.

Seth

 

Put fresh fluid in it and bled it real good. New slave in it too. So im lost with the damn thing. Any suggestions on which way to go with a tranny. I have 600rwhp.

 

YES!!! PM Sent!

 

What trans fluid did you use?

I've found my T56 and three others I've helped with actually shifted the most smoothly with plain Dexron-III type fluid, rather than synthetics. The difference was most apparent when the trans was not yet up to operating temp.

My favorites are Castrol Domestic Multi-Vehicle Dex/Merc, and CAM-2 Dex/Merc.

 

Seems like you have done most/all of the items on the "things to do" list.

Here is the list when the transmission starts to act up:

1) Change the fluid (most likely will fix or help)
2) bleed the hydraulics (sometimes overlooked)
3) do the shifter adjustment (seen few of these)
4) do the neutral rev test (make sure the clutch isn't dragging)

If all fails, you have internal issues and only way to repair them is to drop the trans and open it up.

 

Didn't the '01 Z06 cars suffer from inferior (aluminum?) shifting forks and something to do with "paper" blocker rings?.

Try search or search this forum in C5 Tech (in the red banner). Use "paper blocker rings" or "aluminum shifting forks" as keywords. Here's one...

http://forums.corvetteforum.com/c5-t...01-coupes.html

And I found this...

QUOTE:

"Manual transmissions -- Replacing the transmission fluid often helps shifting. Early transmissions have paper blocker ring that require Dexron III compatible (usually organic) fluid because some synthetics will destroy the paper blocker rings and subsequently the transmission. Later transmissions, and all rebuilt transmissions, have Kevlar/carbon fiber parts that allow the use of synthetic fluids. I believe the 98-00 transmissions have the paper blocker rings. The safe transmission fluids seem to be: GM Synchromesh PN #12345349, Honda ATF-Z1, Royal Purple Synchromax, Amsoil ATF, O’Reilly Dexron III ATF. The following transmission fluids may be unsafe for early transmissions: Redline D4 ATF, Mobil 1 ATF, Royal Purple Max ATF.
Related threads:
LS1.com - Ending the speculation: Blocker rings, who's had them fail?
LS1Tech.com - Ending the speculation: Blocker rings, who's had them fail?
Mobil 1 Synthetic ATF for a M6?

If it is especially tough to shift into 2nd or 4th gear, it's possible that the synchro's are worn out or the forks are bent. Do NOT force it into gear. Abuse creates and aggravates this problem. You can still drive, even quite well, without synchro's....or a clutch for that matter if you know how to rev match."