Tremec Missed 1-2 shifts, Notchy

[Orange Krate]

Originally Posted by togtaker

got my car back from the delaer Friday with the new style syncro (black carbon fiber), syncro slider assembly, blocker ring and second gear. All those parts are listed earlier in this tread. Does not grind now, shifts much smoother than it ever did, seems like a slightly long throw 1st to 2nd, but maybe that just me after not driving it for almost 3 weeks (one week at the dealer, two weeks of bad weather). I don't think my issue had anything to do with the clutch.

Tog, did they list the required shims on your new rebuild? That is one of the issues discussed in the Forum was the required input shaft shims to give you the correct clearance and play so there is no chatter. Also at issue was the pressure plate bolts backing out and becoming loose. Sounds like a thread locker may be in order to correct this issue as well. I HATE bugs in new cars!!! All so frustrating.

[OUTATIME]

Originally Posted by togtaker

got my car back from the delaer Friday with the new style syncro (black carbon fiber), syncro slider assembly, blocker ring and second gear. All those parts are listed earlier in this tread. Does not grind now, shifts much smoother than it ever did, seems like a slightly long throw 1st to 2nd, but maybe that just me after not driving it for almost 3 weeks (one week at the dealer, two weeks of bad weather). I don't think my issue had anything to do with the clutch.

You're in NJ - what dealer did you go to? And I see you also have a 2011, which means even the late 2010s didn't have the updated part I guess.

[B6pilot]

Mine is going back in today, wish me luck!

[ssmike]

Good luck! Let us know the outcome!

[togtaker]

Originally Posted by OUTATIME

You're in NJ - what dealer did you go to? And I see you also have a 2011, which means even the late 2010s didn't have the updated part I guess.

Bennett chevrolet in Egg Harbor Township. My 2011 didn't have the new style syncro. Not sure when it came out, but I imagine a TSB will be issued on it at some point.

[togtaker]

Originally Posted by Orange Krate

Tog, did they list the required shims on your new rebuild? That is one of the issues discussed in the Forum was the required input shaft shims to give you the correct clearance and play so there is no chatter. Also at issue was the pressure plate bolts backing out and becoming loose. Sounds like a thread locker may be in order to correct this issue as well. I HATE bugs in new cars!!! All so frustrating.

Shims were not listed. I got on it hard after I picked it up and no grind. It seems to be very different than it was before, the throw seems a little longer.

[togtaker]

Originally Posted by booenson

I made this thread a while ago to complain about the notchiness of 2-3.

http://www.camaro5.com/forums/showthread.php?t=97186

I'm wondering now if the two problems are related to each other? To sum up my problems, under any rpm, any load, warm or cold, my M6 will occasionally have a slight nibble between 2 and 3, never any other gear, 4-3 is fine as well. What I'm talking about is when you have the shifter centered and are about to put it into third, about halfway through theres a little notch that I can definitely feel, and can also feel a bit when the car is off. It definitely makes an audible noise when it happens.

When I took my car in for the spoiler TSB, I mentioned this to my service advisor and he said to give it a few more km's to break in a bit more. Just for shits and giggles, I also test drove a 2SS with ~12 000 km's on it, and sure enough, it did the same thing.

For the record, I'm absolutely fine with my clutch. It's a weird one but it hasnt given me any problems yet, knock on wood.

I'd like to upgrade to an MGW shifter but I don't know if that will solve the problem, or simply amplify it. I also wouldn't mind trying some Mobil 1 ATF however I'm wondering about warranty issues down the road regarding the tranny and/or clutch.



Can you maybe post up your service report or even just the part numbers used? What did you have to complain about first before your dealer did this repair?

I took it in for the grinding 1-2. Dealer called tech support, they said operating as designed pause your shift. Then I went to customer service on the website, got the same answer. Sent a letter to the executive office. Talked to them, they went to the head of engineering, called the dealer and told them what parts to order. It's a pain but you just have to stay on it until they fix it.

[TRC-SS]

So just curious....does anyone know if they started updating the synchros on the camaros or is that just a rumor....ordering mine next month...got me all worried

[togtaker]

I asked the guy I talkedc to at GM corporate office. His answer was kind of vague. They have redesigned parts so they should be going into production, then they should eventually put out a TSB which will list the production dates that had the updated parts vs the old parts. Once they start acknowledging this problem it should be much easier to get them to fix it, they've just been in denial. I wouldn't let this stop me from ordering one.

[B6pilot]

I took my car to the shop yesterday, It grinded twice on the way to the dealer but of coarse it didn't do it for the service maneger. I did show him the video I made to prove I wasn't just making this up. He told me that GM wasn't happy that I installed the Hurst shifter and they were blaming my grinding on the shifter. I'm going to try to call Hurst today and ask them about it. They have the car today so I should here something. They also need to finish some paint work from 3 weeks ago (install hood stripes, buff dirt out of repainted hood, rear spoiler chips). I was reading the forums and came across a member "camaropete" who has something to do with the camaro warranty department, I was thinking of sending him a PM for help with this. Anyway, I'll keep you guys posted.

B6pilot

[ssmike]

Have you ever had it in for this problem with the stock shifter in there so it's documented?

[B6pilot]

Originally Posted by ssmike

Have you ever had it in for this problem with the stock shifter in there so it's documented?

I did but I never brought it in. I actually thought it was me and I missed shifted it. It wasn't until a friend drove it and it did the same thing that I became aware of the issue. I think that sometimes the clutch isn't fully disengaging and that causing the grind sometimes. My problem is now that it has grinded on a daily basis the new 2nd gear is grinded down again making the problem worse (low speed/ low rpm shifting). Do you think air in the clutch line could cause it? My reservoir was leaking.

[Rick@RKT56]

OK, here is an update after some digging with my parts dept. I think GM DOES have the carbon 2nd gear blocking ring. When I looked up the blocking rings for the 2011 model year, it does list a new part #. The old part # is 19256241 but it states to use 19256242. I can't tell without looking at the part but the next Camaro that I do will have this part and I'll snap some pics.

One thing to note to you guys, since the TR6060 have such a small synchro teeth, they will continue to grind after few missed shifts. If any of you currently has grinding issue at low RPM shifts, I'm sure it was due to the teeth rounding off. Only fix? Replace the synchro and the coorespondng gear.

[ChevyCowboy]

Originally Posted by Rick@RKT56

OK, here is an update after some digging with my parts dept. I think GM DOES have the carbon 2nd gear blocking ring. When I looked up the blocking rings for the 2011 model year, it does list a new part #. The old part # is 19256241 but it states to use 19256242. I can't tell without looking at the part but the next Camaro that I do will have this part and I'll snap some pics.

One thing to note to you guys, since the TR6060 have such a small synchro teeth, they will continue to grind after few missed shifts. If any of you currently has grinding issue at low RPM shifts, I'm sure it was due to the teeth rounding off. Only fix? Replace the synchro and the coorespondng gear.

Thats good to hear, at least it appears gm has a part to fix this issue, now its getting them to issue a tsb so all owners exsperiencing the problem can get it fixed as hassle free as possible