3rd gear grind at higher rpm - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 10-16-2013, 12:46 AM Thread Starter
 
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3rd gear grind at higher rpm

Hi,

I am looking at this nice 06 gto with the t56 6 speed trans. There is a grind when shifting into 3rd at medium to high rpms. Every other gear is fine.

Is this a common problem?

from my experience with manual transmissions the most likely cause of gear grinding would be the syncro's but I have never owned a gto or any gm vehicle.

If a rebuild would be required, can anyone ballpark a $$ amount? I am in NYC area.

Thanks
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post #2 of 4 (permalink) Old 10-16-2013, 06:14 PM
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The stock clutch can do the same thing of not disengaging fully at high RPM

2004 Blk/Rd M6
6.3 litre LS1

Built and tuned by svede
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post #3 of 4 (permalink) Old 10-16-2013, 06:29 PM Thread Starter
 
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The stock clutch was replaced with a z06 clutch.
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post #4 of 4 (permalink) Old 10-16-2013, 07:53 PM
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But I'll bet is wasn't checked for shimming. Most mechanics assume it's "stock" for that drive-train so they just bolt up and go. The tolerances of the hydraulics are pretty critical.

Park your car on a flat surface and while in gear with the brakes off rev the engine and see if you move. If you even feel it a little the clutch is dragging and possibly needs the slave shimmed. There is a procedure for measuring.

2004 Blk/Rd M6
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