Tremec Missed 1-2 shifts, Notchy

[Big C CamaroSS]

Happened to me for the first time tonight ever so slightly. I only got my SS on Friday (its Sunday) so I nearly had a heart attack! Its a sound no one wants to hear! It seems like the shifter wants to go into 4th (and the little shift pattern pic with the arrow from 1st to 4th appears on the dash). I just read another post that the car is actually telling me to shift into 4th (because I'm revving the motor high). Yesterday I read about this shifting problem, and when it happened tonight, I thought...."There goes the transmission!!". But then when I got home, I watched the 2 videos that the Camaro5 member took of his grinding, and its nothing like that. I will, however, keep an eye on this thread! BTW I can't believe how absolutely fun this car is to drive!!!

[ckaram]

Originally Posted by Big C CamaroSS

Happened to me for the first time tonight ever so slightly. I only got my SS on Friday (its Sunday) so I nearly had a heart attack! Its a sound no one wants to hear! It seems like the shifter wants to go into 4th (and the little shift pattern pic with the arrow from 1st to 4th appears on the dash). I just read another post that the car is actually telling me to shift into 4th (because I'm revving the motor high). Yesterday I read about this shifting problem, and when it happened tonight, I thought...."There goes the transmission!!". But then when I got home, I watched the 2 videos that the Camaro5 member took of his grinding, and its nothing like that. I will, however, keep an eye on this thread! BTW I can't believe how absolutely fun this car is to drive!!!

Pull out your owner's manual and read the 1-4 skip shift section. What you experienced was the 1-4 shift when your engine's at a certain temp, car speed between 16 and 19 mph and less than 20% throttle (doing this from memory so forgive me if I'm off). DO NOT fight against this 1-4 shift. What I do is pause or go back to neutral then to second. Don't try to jam it into second with the 1-4 shift lit up. The issue they're experiencing is completely different, when revving high and shifting fast.

[Big C CamaroSS]

Yeah I realize this now and feel like a tool for posting :(. I now know why the shift pattern pic would come up when I put my foot on the clutch and hadn't even started to shift. Its been so busy this weekend I haven't had a chance to read the manual. My SS was built in May 2010 so I hope this issue doesn't rear its ugly head. To everyone who IS experiencing shifting problems, I truly hope GM steps up and does the right thing.

[Memaat]

The GM Rep came to the dealer yesterday to meet with me about my on-going concerns about 2nd gear "chatter" from my Tremec, which gets louder by the day. He claims it is the after market pistol grip (I bought off this site), amplifying the noise into the car compartment. The fact that it only chatters during 1st and 2nd tells a different story. Anyone with this issue please reply.

[Rick@RKT56]

OK guys, I have been away for a while but I wanted to wait before posting my results. I have rebuilt/upgraded 3 TR6060's and the results are in. 2 are from 08 C6 Z06 and the other from 06 Z06 that I upgraded with a TR6060 from a 08 Z06. The 3 transmission received the carbon blockers on the first 4 gears along with braonze fork pads. All 3 owners have some miles on it and told me that shifting is smooth as silk. I personally drove the 06 with the 08 TR6060 and it is in fact very smooth without any issues. I do think the carbon blockers engage smoother than the sintered bronze blockers.

I will be performing the same upgrades on few 2010 Camaro TR6060's so stay tuned, I'll post my results when I get them done. Maybe few pictures also.

[Rick@RKT56]

Originally Posted by camarorick

The tech working on my tranny adjusted the lateral play on the internals from 0.001" to 0.006".... He told me that GM specs the play to be between 0.002" - 0.0025", but he's rebuilt MANY trannies for Vettes, and the GM spec is still too loose, so 0.006" it is.... There's a lot less " slack " in the tranny

I'll be leaving for the Oshawa trip shortly, so I should have a REALLY good idea of how it worked out ( so far, so good ).

Are you sure this is what the tech told you? Per SI (Service Information the GM techs use), the mainshaft and the countershaft are set up with 0.00049 to 0.00349" preload.

I personally set both shafts with 0.002" preload. More than that you can burn up the bearings and too little you can have shifting issues. Below is what's stated in the GM SI.

1. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) preload.

[njdad61]

As an update to all of my prior posts on this thread:

2nd gear is still grinding and getting worse by the day. It used to subside when the tranny was fully warmed up, but now it grinds horribly with every fast shift, especially at high RPMs. I was in contact with the local dealer's service manager, who assured me they would get the problem taken care of after his ride-along and a viewing of the video I made. An engineer from GM was supposed to travel here for a test ride months ago, but never showed. Since then, I have tried contacting the service manager numerous times with no luck. He's either been helping a customer, out of the office, left early for the day, didn't come in at all, or has been there and the service techs couldn't find him anywhere. I have left several messages with my name and phone #, but have yet to receive even one call back. At this point, I'm just going to keep driving it as normal until the 2nd gear completely grinds off... The most frustrating part is that I am forced to drive with a stock tune until this existing issue is taken care of, because even though a custom tune would have nothing to do with this problem, the dealership would undoubtedly wash their hands of it if I modified the factory tune. I wonder if I got documentation that the problem started before the tune was modified, maybe it would still be warrantied...

[Matt@Tick]

Worth a quick read: http://www.camaro5.com/forums/showthread.php?t=158655

[Rick@RKT56]

For those of you with the 2nd gear grind have a look HERE.

[kaylew78]

here is a link to file a safety complaint with the nhtsa (national highway traffic safety association) ford mustang owners have had the same problem and enough people filed complaints forcing ford to "look into it". this is a safety issue because people have come close to accidents due to the transmission not going into gear either while merging into high speed traffic or in town drivers getting rear ended. cmon everybody take a few moments to file your complaint: https://www-odi.nhtsa.dot.gov/ivoq/

[camarorick]

Originally Posted by Rick@RKT56

Are you sure this is what the tech told you? Per SI (Service Information the GM techs use), the mainshaft and the countershaft are set up with 0.00049 to 0.00349" preload.


I personally set both shafts with 0.002" preload. More than that you can burn up the bearings and too little you can have shifting issues. Below is what's stated in the GM SI.

1. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) preload.

So, how long before my bearings bite the dust ... The Tech also indicated on the work order that the play was adjusted from 0.001" to 0.006" ( so if there's an issue, I have documentation that says what he did beyond GM spec )... To be honest, my transmission was very " clanky " before, and it feels pretty tight now... Could it be my transmission was way too loose ??

[pdesanctis]

Originally Posted by kaylew78

here is a link to file a safety complaint with the nhtsa (national highway traffic safety association) ford mustang owners have had the same problem and enough people filed complaints forcing ford to "look into it". this is a safety issue because people have come close to accidents due to the transmission not going into gear either while merging into high speed traffic or in town drivers getting rear ended. cmon everybody take a few moments to file your complaint: https://www-odi.nhtsa.dot.gov/ivoq/

Lets Do this.

[rick@tandtperformance]

Originally Posted by camarorick

So, how long before my bearings bite the dust ... The Tech also indicated on the work order that the play was adjusted from 0.001" to 0.006" ( so if there's an issue, I have documentation that says what he did beyond GM spec )... To be honest, my transmission was very " clanky " before, and it feels pretty tight now... Could it be my transmission was way too loose ??

Your bearings should be fine. Going from 0.001" to 0.006" is 0.005" more play than before. Did the tech use the updated blocking ring on 2nd gear? If the transmission feel good, I wouldn't mess with it.

This is Rick@RKT56, I'm posting as a vendor with T&T Performance.

[camarorick]

Originally Posted by rick@tandtperformance

Your bearings should be fine. Going from 0.001" to 0.006" is 0.005" more play than before. Did the tech use the updated blocking ring on 2nd gear? If the transmission feel good, I wouldn't mess with it.

This is Rick@RKT56, I'm posting as a vendor with T&T Performance.

Thanks for the response... I was starting to sweat

Yes, he installed the carbon fiber ring on second gear, thanks to your information on this thread I also got the syncro's changed... The new clutch kit... new slave cylinder/throwout bearing, etc...

The transmission is @ 90-95% perfect... there are those times when it's cold, and it feels notchy...doesn't grind, just feels like it's just not perfect.. still better than hearing that grind

I was thinking that maybe getting some Royal Purple will get me to that 100%... What do you think ?