04Z16

Mine is back in the shop for a second look. Now to see how GM is going to respond to this one. The mechanic drove the car and felt the notchy and semi grind with the trans warm, 45 minute ride to the dealer from work. It will sit overnight and I await the response in the AM.

lorenzo

Ok i have been reluctant to speek up on this subject but here goe's

Lincoln nebraska has a population of around 260 thousand and it's small enough to keep track of all the Z06's here. So i was just at the local dealer and noticed they had just sold there only other black one like mine. When i asked who bought it the salesman told me and then went on to say that the car was in the shop already!! he said that the guy didn't even get home and the tranny went out. i asked what went wrong and his responce was that they replaced the whole thing because the syncronizers exploded. ??????????????


It is an 08 by the way.

skip89

TTT, Interesting

obzidian

Ok.....

Just took the car in for service today. I rode with the mechanic, nice guy, and he noticed right away the reverse grind I was talking about. He also noted the notchy feel between 1-2 and 3rd gear. I asked and he replied that he has seen this before and that my isn't the first 08' with this problem. He will order new parts (synchro's, gears, etc) and replace them all. I also asked him to take a look at the clutch as he also noticed that it was "off" a bit.... slipped on occasions.

This is by far a 1 or 2 car issue..... and yet not all TR6060's have this issue..... Its a new trans and with new parts, new problems to deal with. Just the like roof's coming of the cars in 06 and now you never read of a 07-09 roof coming off. Give it sometime and be patient...

A.

MyToyC5

Same here - I've got the grind in 2nd and 3rd, but only when it's cold. After the car warms up the problem is gone.

DriverMod44

i have 2009 with 4000 miles on it and my 1st gear is grinding. im scared to loose the car to the dealer for a month so i am avoiding going at all costs. These things are P.O.S. and whats worse is the dealer cant fix them in a reasonable time. i know a few people that blew there transmissions and were in the dealer for over a month.

xcutter

BenThere

Looking forward to hearing how this works out for you.

RoHo

So what seems to be the problem once they get into the tranny and open it up?

I have an 08 with over 6,000 miles on it and it's alway shifted great, my 06 trans was a little notchy, I just changed the tranny fluid to Royal Purple and it now shifts smooth as butter, but I would still like to find out if there in one particular problem or ?

3 Z06ZR1

Try the RP ATF1
I have an 08 C-6 and It had the slow when cold, never pushed it to
grind. Just babied when cold with real easy shifts. Switched to Royal Purple ATF fluid. Some use the RP Syncromax. This was the RP ATF.
Problem got better. Now at 18k it is a much slicker tranny than any t-56. I should know as I had 4 of them in 4 Cars and 2 had to be dealer replaced, So I much prefer the tr-6060. That was the case for me.

3 Z06ZR1

I'm a lifetime Lincolnite until 2006 I now live in Oregon but still have 3 houses and a farm there. So I come back 3 times a year! Duteau and Husker both were great with there service with my stable of GM cars owned and serviced there.
Go Huskers!

Tom Steele

Can't you get them to confirm the problem, order the parts and then call you and have you bring it in when they arrive?

I'd be angling for that...

GotMoJo

I have the cold grind problem as well. Waiting patiently for a TSB, that is of course after the bailout.

4wheels

I think it's likely that this is a manufacturing defect related issue. The new synchro design is probably more sensitive to clearance & surface finish variation. There could also be metallurgy issues, and even how the car is broken it. Batch to batch variation in manufacturing could explain why some cars do it and others don't. I bet that eventually they release updated synchro's & add some type of part stack up check process before assembly.

titleist731

any earlier 08's with this problem?

04Z16

Got my car back from a different dealer for a second opinion, felt like a doctors visit instead of a dealership visit. GM is not budging from repairing my transmission. The dealer confirmed they feel the grind in 1-2 and also in 3rd and 4th gear. The tech center says the TSB covers this grinding issue and not to perform any repairs on the transmission. I've got a copy of the TSB which addresses cold weather, less than 32 degrees, grinds on the transmission in only 1-2 shifts, it does not say anything about any other gear. Mine will grind with temps below 60 degrees and as said above grinds in 3rd and 4th.
I've had plenty of other style transmissions and none of them acted like this 6060.
Oh by the way, the TSB addresses 2008-2009 Corvette, Z06 and 2009 CTS-V but not the ZR1, different transmission. The transmissions are the MM6, MG9, MZ6 or MH3 RPO coded transmissions.

I am currently waiting on the BBB to arbitrate my case with GM, I should hear something next week after the holidays.

BenThere

Thanks for the update. Exactly the same reaction and information from my dealer. I'm sure they also reminded you that you have a good warranty and if really serious problems problems develop they will fix it. Not the least bit surprising this is the reaction from GM.

This kind of behavior from GM is not unusual. They're going to stonewall this for a while and hope that the transmissions hold up without longer term down-side issues. In the present economic climate, this is the business decision they have made: cost vs. risk.

I wouldn't be surprised to learn that they are having trouble from their transmission supplier as well and/or the supplier's sub-suppliers. QA/QC issues in the manufacture of components that probably require tighter tolerance control combined with no confidence that they can get repair or replacement parts that will fix the problem the first time in the customer's car. Who knows what the contract is between GM and Tremec - they could be going back and forth on who owns the issue behind conference room doors as well.

Bottom line, unless this problem becomes more severe and/or customer complaints become a lot more animated, we won't see much more from GM for a while; they've got much bigger problems to sweat for the next several quarters.

With that said, I am not letting this particular issue detract from enjoying the car (I'm not accepting the GM response either). The problem goes away after 10 - 15 minutes of careful shifting, which is a normal warm-up period anyway. I've got the warranty and the paper trail with the dealer. I will try some different transmission oils and watch the forum and stay in touch with the dealer on TSBs. I still love the car and every day I drive it I just want to drive it more!

bennettrp

I have the same issue and was thinking about using amsoil. It really smoothed out the shifting in my C5.

BenThere

Which Amsoil did you use?

Quickstrike Zo6

So what you are telling me is that I need to get a 06-07. Does anyone know if the 09's are having the same problem or has GM "fixed" the problem?