Grinding gears
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Joined: Feb 2011
Posts: 89
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From: New Orleans LA
Grinding gears
I got grinding in 3rd 4th & reverse. All other gears engage no problem. Is this clutch, transmission, master/slave cylinder? Need to to know what kind of $ this gonna cost me 
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
Hard to tell exactly but usually grinding has a few causes from what I have seen:
-Bad pressure plate/ slave cylinder ( but yours seems ok in other gears so less likely)
-Syncros in trans are going bad ( try to rev match before going into gear and see if it helps. If it does it is most likely weak syncros from what I have seen)
-Broken keys in trans. (Mine grinded going into 3rd and I found 2 broken keys.)
Ive also had strange problems on my GTO like the pressure plate bolts backing out causing shifting issues.
Have you started with the basics and bled the clutch?
-Bad pressure plate/ slave cylinder ( but yours seems ok in other gears so less likely)
-Syncros in trans are going bad ( try to rev match before going into gear and see if it helps. If it does it is most likely weak syncros from what I have seen)
-Broken keys in trans. (Mine grinded going into 3rd and I found 2 broken keys.)
Ive also had strange problems on my GTO like the pressure plate bolts backing out causing shifting issues.
Have you started with the basics and bled the clutch?
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Joined: Feb 2011
Posts: 89
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From: New Orleans LA
I was hoping tranny wouldn't b the culprit but it sounds like it is. I am replacing the clutch and have a leaking master cylinder. But the big problem is bad synchros. Looking like a bigger job than I bargained.
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
Yea It sticks but if you rebuild it right you shouldnt have any issues.
I rebuilt mine in GTO and Vette with my local shop.
I added Billet keys, new syncros, bronze fork pads, steal 3-4 fork.
The vette was a more serious build with the addition of a Gforce Mainshaft.
Also replace the slave cylinder and upgrade to an LS7 clutch and remote bleeder line while you are in there. You will thank yourself later
I rebuilt mine in GTO and Vette with my local shop.
I added Billet keys, new syncros, bronze fork pads, steal 3-4 fork.
The vette was a more serious build with the addition of a Gforce Mainshaft.
Also replace the slave cylinder and upgrade to an LS7 clutch and remote bleeder line while you are in there. You will thank yourself later
Pro
Joined: Jun 2012
Posts: 633
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From: Van Buren Arkansas
My car started faintly grinding going into 3rd gear occasionally. I put a new Monster Stage 2 clutch in with new slave/master and all and now everything works perfect, even put Amsoil in the transmission at the same time. Been in for 15,000 miles and my car doesn't grind any gears what so ever. This might not be your issue but it was mine. Hope you get lucky and it's something easy!
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Joined: Feb 2011
Posts: 89
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From: New Orleans LA
Thanks PEETYZ. Looks like I'm getting the tranny rebuilt. Already was going with LS7 clutch but also going to replace the master & slave while we're in there. All this and a big cam, got half a new car almost.
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Thread Starter
Advanced
Joined: Feb 2011
Posts: 89
Likes: 0
From: New Orleans LA
My car started faintly grinding going into 3rd gear occasionally. I put a new Monster Stage 2 clutch in with new slave/master and all and now everything works perfect, even put Amsoil in the transmission at the same time. Been in for 15,000 miles and my car doesn't grind any gears what so ever. This might not be your issue but it was mine. Hope you get lucky and it's something easy!
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
Trans issues are never fun Ive spend more rebuilding my 2 trans (GTO and vette) then I did on my used procharger kit.....but best to check it now before you hurt anything else.
Best of luck man.
My 3rd gear keys broke on my 01 Z when I had headers only and i don't beat the shifts honestly.
yikes...
Best of luck man.
My 3rd gear keys broke on my 01 Z when I had headers only and i don't beat the shifts honestly.
yikes...
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Joined: Feb 2011
Posts: 89
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From: New Orleans LA
Ouch. Waiting for some hardened parts now. Got me thinking bigger horsepower now since the drivetrain can handle it now. Guess it's better in the long run. This build still doesn't beat the 2 rear ends & front end rebuilds on my silverado. I should be back on the road by this weekend.