Tremec Missed 1-2 shifts, Notchy

[jomo45]

Checking to see if anyone else is having this issue.. I noticed that I started misssing a few 1-2 shifts around the 1,000 mile mark, this only occurs during hard acceleration, not speed shifting, but very quick shifts. When it happens, it doesn't go in to second, and makes the terrible grinding noise I first attempted hard quick shifts around the 500 mile mark, and had no missed shifts until around the 1,000 mile mark.

Took it to the dealer, the tech couldn't duplicate, I was not with him.. When I picked it up, the tech didn't have time to ride with me, I did duplicate it for the service writer. It only missed one out of the three times I tried it with him in the car. I originally thought it was a synchro, and it still may be, but I do notice that the shifter is very notchy between 1-2.(tested sitting still, clutch in) It is butter smooth between 3-4, 5-6, but feels like it is catching on something between 1-2. I am starting to wonder if this is shifter related, instead of transmission?? You guys that have aftermarket shifters, does the 1-2 shift seem smooth?

I will say the first few times this happened, I thought I just f'd up the shift, but it seems to be happening more often now. Just for the record, I have owned many manual transmission sports cars, done a bit of SCCA racing in them etc., not my first rodeo.

I appreciate any insight on this.

[bi11ymc]

Here is the thread you are looking for (if V6 manual)

[ckaram]

Originally Posted by bi11ymc

Here is the thread you are looking for

That's the Aisin V6 6-speed thread. He's got a Tremec (SS).

[bi11ymc]

Originally Posted by ckaram

That's the Aisin V6 6-speed thread. He's got a Tremec (SS).

Thanks for the correction. I had the V6 manual with the same issue before I got my automatic.

[ckaram]

Originally Posted by bi11ymc

Thanks for the correction. I had the V6 manual with the same issue before I got my automatic.

You got the automatic, but looks like you also added a couple cylinders!

[3min3m2]

If it's like my car, get used to it...

My dealers done nothing so far...it's in there again last chance for them so we'll see

[victoryred1ss]

I have missed 2nd gear twice, both after 1k miles but mine was driver error..letting the clutch out before I was in 2nd.

[jomo45]

I definitely considered operator error, Sh&*T does happen! The prob I'm experiencing is much more regular to just be a goofed shift, again, I have a fair amount of experience with no similar issues.

Really thinking this is a Shifter issue, would appreciate any feedback on the aftermarket shifters, specifically the 1-2 shift feel. (Is it notchy, does it catch, etc)

[rcracer78]

+1 on the 1st to 2nd notchy shifting. Yes, it has even grinded gears during spirited driving too. I took it to Connell Chevrolet in Costa Mesa and they said, "It's operating as designed". What a freakin' joke! That's is just pure laziness! Now it's at Selman Chevrolet in Orange. I hope they step up, thoroughly investigate and fix the problem. To me it feels like the clutch does not fully disengaging and has worn the synchros. What's strange is it's notchy whether I'm sitting in the driveway with the engine turned off or driving.

Here is a video of the notchy shifting:




Here is the pathetic worksheet from pathetic Connell Chevrolet:



You saw the video, right? So how can Connell Chevrolet be so oblivious?

[goodwrench265]

I have/had the same problem with my car. I used to work at the dealer that mine is at. Mine started around same mileage. My first trip the tech was an asshole and printed me off a symptom list of manual transmissions. I kept driving it until it got worse. I went back and had service manager go for a ride. He had it act up on his first try. They are replacing a whole slew of parts in my tranny. They said it is definately not right. I am supposed to get the car back today. I will report my findings.

[jomo45]

Mine has gotten worse, took it back last Friday for another drive with the dealer, and they do agree something amiss..

It goes in tomorrow am, they want to start by doing an oil analysis.. pretty sure they will find plenty of metal. I'll report back once I know more.

Fyi, mine also has what sounds like a rattle in the throwout bearing, occurs when you load/unload the drivetrain via the clutch. I can duplicate it easily just rolling at a few mph, very noticeable rattle. I tend to think my transsmission issues may be clutch related, although I haven't had the sticking clutch some have reported.

In my original post I was wondering if the shifter it self might be the issue, replaced it with an MGW, didn't fix the problem. (really didn't think it would) The MGW is excellent, just as many have reported.

[06blownSS]

I too find 1-2 the easiest to grind. Like others, at first I thought its a driver issue. Now I am starting to doubt its me and more of a problem...hopefully it does not get worse.

[2010 2-Tone]

My car did exactly the same as yours but only under WOT and only sometimes. I changed to the Barton shifter and it still does it. Let us know what they do and if it helps. Thanks,

[SuperFly03]

Mine is at Lone Star Chevrolet today and this is one of the many issues I am having with mine. It's so bad I want to go back to the GT500. That thing has a wonderful shifter... and this was before they included a short throw shifter stock.