04Z16

Well I had it and have had it with GM. I just won arbitration with GM and my Z will be going back via Lemon Law for GM's failure to fix the transmission grind.
There is no reason for us to have to put up with a crappy transmission on such expensive cars. I hope to be out of this car in the next week.

When you bring your cars in make sure you keep all of the documentation and any phone calls, letters etc. It helps if you have to go the arbitration route.

I feel for everyone with a grinding transmission, it is a pain. I haven't driven mine in about two months other than to wash it and the grinding is annoying to say the least. My second gear at times feels like it wants to jump back to first, third and fourth are just about as ugly.

Good luck with the wonderful T6060 transmissions.

04Z16

There is a TSB on the grind, it is a joke to say the least. Basically it tells everyone you have to live with it. It calls out a specific temp of 32 degrees and tells the technician to drive the car 20 miles and see if the problem goes away, if it does it is normal.

VET4LES

Good news.

jccarr

I figured out my 08 with 10,000 miles on it when it started to get cold last fall no longer had the issue. I'm sure it corrected itself prior to 10,000 miles but I did not notice it till fall. I do change the clutch fluid very few 1000 miles for what is is worth.

04Z16

I did the clutch fluid change, it was clear when I started and clear when I finished. No change in how the transmission acted.

robertjmagee

Good info.

C6~Missle

Good luck trying to find another ride that comes close for twice the price.
The fact that the transmission works perfectly when warmed up tells that its not a catastrophic defect. Mine took about 4K miles to "loosen" up and does not exhibit any more grinding when cold.

rjwoerheide

It does make one wonder why they changed to a new transmission in the first place

Sorry to hear you had such a bad time with the grind that it has ruined your Corvette (and Z06, no less) experience. I agree it is total BS for Chevy to say it's "normal."

C6~Missle

It makes lots of sense... It's a much better unit...

read here:

http://www.corvetteactioncenter.com/...008tr6060.html

Tracktimeplz

Hmm, maybe im crazy, just throwin this out here, but could it be a little bur left on the gears from the machining process? This would explain it just "Going away" after getting some miles on it. Maybe just a little imperfection in there that gets worn down???

rjwoerheide

Thanks. That's an interesting list.

"2008 Model Year Summary
Tremec TR6060 six-speed manual car transmission

* Wider gears increase torque-handling capability
* Stronger one-piece countershaft now standard on all versions
* Housing strengthened to minimize flex and improve shifting
* New synchronizer system reduces shift efforts
* Integrated pump into front adaptor
* Double-cone reverse gear synchronizer added for easier reverse selection"

Perhaps it's the new synchronizer and those reduced-shift efforts

Wayne O

I'm glad your problem went away. I would still suggest changing the transmission fluid for 'good measure.' I never had any problems with my 2005 gearbox but I did switch to Royal Purple Synchromax. No matter which fluid you use, I think using fresh, clean transmission fluid could only help.

I sympathize with your problem and with all due respect, "...not using 2nd gear anymore" isn't a solution. Avoiding the problem seems wrong to me...you paid for a functional transmission and for warranty coverage in the event of a problem. On a personal note, I couldn't imagine driving around not using gears in 'proper' sequence. If the problem is that bad I strongly suggest you take your car to the dealership and fix it.

C6~Missle

Also torque specs might be off which would correct itself over time with heat cycles and some wear.. Over the years I've had gear boxes that required warm up time before they shifted smoothly.. this one is no exception. These are large HD trannies that handle huge amounts of torque.. I don't expect it to have the same finesse as one in a Honda civic that is desgined to handle 80 ft lbs of torque..

AORoads

I agree. Let's also note that Wayne is recommending actual transmission fluid, not clutch fluid, as compared to what 04Z changed out.

KBoltz

I should count myself extremely lucky. My 08 never had this problem. I'll continue to pray to the Corvette Gods that my car (other than the one weird problem with the blower motor which has never reoccurred) has been problem free.

If you guys haven't swapped out shifters, do so. The engagement is so much more positive in the MGW.

Rons65

I have a 09 Z06 - so far, I have not had any issues with shifting.......cold or warm. Of course, I do warm up the engine for a couple of minutes and take it easy until warmed up, but I for one am very happy with the transmission and shifting - this is my 2nd C6 MN6 and both were good - I agree with the advice to take it easy until warm, etc. Makes you wonder on the actual tech's who put these transmissions together if there wasn't 1 or 2 unhappy employees!

Good luck, Ron

bimmerborn

Yes. "Ranger" method Every 750 miles regardless of reservoir being dark or not.

Thank you for your reply. Yes, identical to the issue I have right now, except it is a bit more than notchiness. I hear 2-3 sawtooths while shifting to 2nd. Yes, I use Prestone Synth DOT-4 too.

Thank you for your reply Wayne O. I agree. Avoiding the problem is not a solution in this case. I also agree with 'proper' shifting sequence. Hence all of us MN6 users got rid of CAGS. I was not very clear when I said I do not use 2nd gear. Of course I do use that gear naturally after driving for 10+ miles. Before that, if I have to use 2nd, I pause, double clutch, and rev match too.

lstorm2003

that was me... Dealer tried to rebuild it first (despite my objections). They made it worse. About 45 days later, I finally got my car back with a brand new transmission. This one seems to be working well so far..

lstorm2003

here is what mine was doing:

http://www.youtube.com/watch?v=a6tMEmeBjkU

turn up your sound..

cor28vettes