New M22 - 4th Gear Grinds - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 10-27-2013, 04:58 PM Thread Starter
 
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New M22 - 4th Gear Grinds

Hi,

I recently purchased an M22 to replace an original M20 in my 1967 GTO. It shifts fine under normal driving conditions, however, when I get on it and am going through the gears quickly (taking it to red line), I noticed that 4th gear grinds a little and after it goes into gear, it makes a high pitched winding noise almost like something is still spinning extremely fast. It is only this gear that this occurs in and only happens when I get on it.

I intend to contact the guy I bought it from (it does have a warranty), but would like to hear from others about possible causes. I don't think it is my clutch, otherwise all gears would grind, possibly a synchro? If so, why only at high RPM's?

Thanks,

Tony
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post #2 of 5 (permalink) Old 10-27-2013, 05:07 PM
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Worn synchro in 4th gear.
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post #3 of 5 (permalink) Old 10-27-2013, 06:42 PM Thread Starter
 
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Possibly, but how could that be? It has less than 200 miles on the transmission. Does that imply that it was not built correctly?
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post #4 of 5 (permalink) Old 10-28-2013, 02:04 PM
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Yes. The synchro assembly could be defective or installed incorrectly. It needs to come apart for inspection to determine the condition of the parts.
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post #5 of 5 (permalink) Old 10-28-2013, 06:13 PM Thread Starter
 
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OK, thanks for the feedback. I will respond back with the outcome as the story unfolds.
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