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2nd to 3rd grinds, but only when cold

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Old 04-30-2010, 10:24 PM
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Default 2nd to 3rd grinds, but only when cold

So i just bought a z28 m6 and didn't really notice it at first, but lately it's been pretty consistent that it will grind a little bit going from 2nd to 3rd.(clutch is completely pressed in) It will go in, just grinds. It only does it when it's cold, once the car has been warmed up and grinded a few times it completely goes away. Could it just be the transmission fluid? Car has 125k..

I have never driven a 6spd ls1 before and i should also mention that there is a lot of vibration in the clutch. I can only really feel it at 2500+ RPMS, not so much down lower. Not really sure if this was normal or not...
Old 04-30-2010, 11:06 PM
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Originally Posted by slikrider20
So i just bought a z28 m6 and didn't really notice it at first, but lately it's been pretty consistent that it will grind a little bit going from 2nd to 3rd.(clutch is completely pressed in) It will go in, just grinds. It only does it when it's cold, once the car has been warmed up and grinded a few times it completely goes away. Could it just be the transmission fluid? Car has 125k..

I have never driven a 6spd ls1 before and i should also mention that there is a lot of vibration in the clutch. I can only really feel it at 2500+ RPMS, not so much down lower. Not really sure if this was normal or not...
Sounds like your 3rd gear blocker/synchro is worn out. Common on higher mileage transmissions, or ones that have been abused. Mine did the same thing before I rebuilt it, it would get gear clash (grind) going into 2nd, 3rd, and 4th when cold. When it warmed up it was much better. Only solution is a rebuild.

Vibration is typically a sign of something being out of balance. Could be the clutch itself, or something else in the driveline, such as the driveshaft. It should be relatively smooth (no noticeable vibrations) especially with stock mounts.
Old 05-01-2010, 12:58 AM
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Good answers, although no way do i have money for a rebuild, or really anything for that matter. Good thing i have a daily
Old 05-09-2010, 11:26 PM
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bump..any other thoughts? I wish i could explain it better. It really only does it maybe 2 times, and only if i let the RPMS get above 2k before i shift. If i shift slowly and keep the RPMS down it won't grind even when it's cold. But once i shift it a few times, it goes in just find no matter what RPM i'm at.

As far as the clutch, like i said it doesn't do it until the RPMS are up. This seems to be when all my problems arise. It's like a tingling sensation it gives to my foot..
Old 05-13-2010, 12:39 AM
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bump.



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