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Old 09-23-2017, 01:07 AM   #1
3L337 C6
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Default Manual owners - gear shifting question

Own a 2017 m7, rowing gears has been a blast, question though, shifts between 1 and 2 and 2 to 3 sometimes seem like you're grinding the shifter into place. Is this normal? Are my synchros out or something? Quick shifts sometimes feel like I'm forcing the car into gear even with a ton of throttle. Not as smooth as I'd think a car like this would be. The porsches I've run seem to shift manually a lot easier. I'm not reading the 1-4 shift warning either. By the way - link me to the defeat please. Thanks,
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Old 09-23-2017, 02:10 AM   #2
djnice
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I don't notice a grinding feel. Maybe I subconsciously pause and let it shift. Maybe put some miles on it then change to a redline fluid AFT and MTS mix.
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Old 09-23-2017, 02:34 AM   #3
Boba Fett
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17 M7 here as well
done some serious shifting and can say I haven't experienced any of which you describe
you may have an issue
good luck
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Old 09-23-2017, 06:28 AM   #4
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I only notice it being a little notchy when cold. As for the 1 to 4 skip shift: I never lug it enough for it to rear it's ugly head. Never felt compelled to buy anything to defeat it on any newer Vette I've owned that had it.
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Old 09-23-2017, 06:55 AM   #5
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I agree with Boba. Something doesn't sound right. Under warranty.
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Old 09-23-2017, 07:33 AM   #6
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Not picking on you but it has been mentioned on forums here before that the clutch on C7s typically begin releasing at a fairly low point. If the clutch pedal isn't pushed to the very limit (bottomed out) the tranny will "tell" you with the unnatural feel you describe. Don't know your situation, but if folks coming from an Auto where you can sit way back from the pedals & have lots of leg room, doesn't work well with the M7. If not, as others say, off to the dealer to check it out. Good luck!

Last edited by madrob2020; 09-23-2017 at 07:35 AM.
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Old 09-23-2017, 07:35 AM   #7
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I have only owned manual C-7's and have never experienced your described situations. I would have it checked out when you have service.
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Old 09-23-2017, 08:03 AM   #8
hcvone
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The stock shifter is a little notchy when compared to the MGW I have had in my other Corvette's, and soon in this one, but the trans itself is very smooth on my car
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Old 09-23-2017, 11:12 AM   #9
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Tranny will nibble the gears on the 1-2 shift when cold. Affect lasts for a mile or so after engine start. Nibbling after that usually indicates you are releasing the clutch a smidge too soon.

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Old 09-24-2017, 02:50 AM   #10
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Notchy is great term to describe it. Come to think about it, it does happen when it is cold and that is when I notice it. Will try to be more aware of it post warm up and see if that makes a difference or check my clutch useage, but I highly doubt it is that since I am 6'3" and still have the seat forward in racing position. It almost feels like the mechanism that forces the 1-4 shift doesn't retract completely all the time. Thank you all for the insight and replies.
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Old 09-24-2017, 10:04 AM   #11
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Had the same issues you described...a Calloway or MGW short throw shifter will fix your problem. However as Bill stated when cold the shifter is still "notchie" for about a minute until it fluid moves around and warms up.
v/r
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Old 09-25-2017, 12:29 AM   #12
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Quote:
Originally Posted by hcvone View Post
The stock shifter is a little notchy when compared to the MGW I have had in my other Corvette's, and soon in this one, but the trans itself is very smooth on my car
I currently have a bit over 700 miles in my 2018, and an MGW shifter will be my first modification. The transmission itself is fine, but the shifter is a bit long of throw and vague for my liking, and I was very happy with the MGW shifter I had in my C6 GS, so the new ZO6 will soon have the MGW shifter.
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Old 09-25-2017, 03:01 PM   #13
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Quote:
Originally Posted by 3L337 C6 View Post
Own a 2017 m7, rowing gears has been a blast, question though, shifts between 1 and 2 and 2 to 3 sometimes seem like you're grinding the shifter into place. Is this normal? Are my synchros out or something? Quick shifts sometimes feel like I'm forcing the car into gear even with a ton of throttle. Not as smooth as I'd think a car like this would be. The porsches I've run seem to shift manually a lot easier. I'm not reading the 1-4 shift warning either. By the way - link me to the defeat please. Thanks,
I get the same grind, 1-2, with my 2016 Z06 Z07 M7. Annoying. Curious what the fix it......
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Old 09-25-2017, 07:30 PM   #14
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That 1st to 2nd shift is a little tight till it warms up then its smooth as a new baby's butt.
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Old 09-26-2017, 03:31 PM   #15
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Quote:
Originally Posted by 3L337 C6 View Post
Own a 2017 m7, rowing gears has been a blast, question though, shifts between 1 and 2 and 2 to 3 sometimes seem like you're grinding the shifter into place. Is this normal? Are my synchros out or something? Quick shifts sometimes feel like I'm forcing the car into gear even with a ton of throttle. Not as smooth as I'd think a car like this would be. The porsches I've run seem to shift manually a lot easier. I'm not reading the 1-4 shift warning either. By the way - link me to the defeat please. Thanks,
As the others have said, at times when the transmission fluid is cool this happens for a short period until the fluid warms up a little.

However you live in Southern Cal so you haven't dipped down into colder temperatures yet so I don't think you should notice this after a few minutes of driving if your car was normal.

I have had this issue in a few Vettes over the years. I bled the clutch slave/release bearing and it solved the problem each time.

Recommend taking it to the dealer and tell them you are grinding gears between shifts and you think the clutch needs bleeding. They may do it for you under warranty. If they wont you then have a choice to pay them to bleed it or bleed it yourself.

This is where I would start. I have seen many shifting issues resolved by this simple step. I have also seen a bunch of time and money spent to fix issues that aren't there, simply because the slave needed to be bled in the first place. It is a simple procedure that cost very little. If it doesn't fix the issue not much is lost and you can troubleshoot further knowing for a fact the hydraulics are good.

Also, you said this happens in the lower gears. Not going into why, but this is another indicator of the slave needing to be bled, or more accurately the clutch not releasing completely and quickly enough, which is always more pronounced in lower gears.

Lastly, for the few of you out there who aren't sure you may have this issue; Lets say yours is marginal for the sake of discussion. This puts extra wear and tear on your synchronizers/blocker rings and over time could reduce the life expectancy of your transmission.

Let us know what you find.

Last edited by dar02081961; 09-28-2017 at 05:47 PM.
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Old 09-28-2017, 03:17 AM   #16
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I have the same with my M7, I hear that there is a shifter adjustment procedure which will make the shift cleaner. on Mine if I pay close attention the problem is that the 2nd gear shift dosen't fully engage - the shifter hit the stop before the transmission makes it into the detent.

Maybe this weekend I"ll have a chance to look at it.
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Old 09-28-2017, 07:49 AM   #17
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Quote:
Originally Posted by 2highpsi View Post
I have the same with my M7, I hear that there is a shifter adjustment procedure which will make the shift cleaner. on Mine if I pay close attention the problem is that the 2nd gear shift dosen't fully engage - the shifter hit the stop before the transmission makes it into the detent.

Maybe this weekend I"ll have a chance to look at it.
There is a service bulletin out there for the shifter.
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Old 09-28-2017, 11:50 AM   #18
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Back when I had my 15 M7 it was a little rough on those shifts, but broke in around 10K miles and didn't do it anymore. BTW I had already sold that one by the time I was told/and actually see the difference that an aftermarket shifter was a huge improvement on the car.

Last edited by Thomasmoto; 09-28-2017 at 11:52 AM.
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Old 09-28-2017, 05:30 PM   #19
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Quote:
Originally Posted by 2highpsi View Post
I have the same with my M7, I hear that there is a shifter adjustment procedure which will make the shift cleaner. on Mine if I pay close attention the problem is that the 2nd gear shift dosen't fully engage - the shifter hit the stop before the transmission makes it into the detent.

Maybe this weekend I"ll have a chance to look at it.
Yes the shifter adjustment can help with your particular issue.

However:

The shifter adjustment is for popping out of gear, grinding gears or difficulty locking into gears. This is different from the issue the OP is having. It seems like a slight difference but the solution is totally different.

The OP stated that he had issues grinding gears in both the upper half and lower half of the shift pattern. (odd numbered gears 1,3,5,7 being upper and even numbered gears 2,4 and 6 being lower).

A problem that occurs in both the odd (upper half) and even (lower half) of the shift pattern isn't likely to be caused by an improperly centered shifter. This is because the shifter can only move (adjust) in one direction (further forward or further backwards) thus making at least one of the halves worse. So properly centering the shifter cant normally resolve an issue that affects both odd and even numbered gears.

It is a fairly easy adjustment however and is worth a try if your issue is with 1 gear or gears in the same half of the pattern. Just remember to adjust the shifter in the opposite direction of the gear that you have issue with. And we are talking a small adjustment 1 or 2 millimeters per try, so scribe the shifter bolts before you loosen them so you know how far you have gone.

Last edited by dar02081961; 09-28-2017 at 05:41 PM.
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