Transmission gear whine - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 05-07-2017, 12:38 PM Thread Starter
 
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Transmission gear whine

I distinctly remember that the M20 transmission had a significant and very pleasant gear whine as I was rowing thru the gear box.
My recently acquired '65 couple has almost no gear whine..It's hardly audible. I see on you tube that cars being driven exhibit that gear whine, especially in first gear..
I don't know if the transmission was rebuilt, I have no indication that it was as it's a numbers matching drive train and the records I have show some engine work but nothing for the tranny or rear end.

Can anyone shed some light on why a quiet transmission. By the way, it functions perfectly just don't make those pretty gear sounds that I remember from my youth.

CDL
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post #2 of 3 (permalink) Old 05-07-2017, 03:32 PM
 
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Garage
It is the M-22, "Rock Crusher" that has the whine due to its straighter cut gears, no the M-20 or M-21. You can hear it hear:
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post #3 of 3 (permalink) Old 05-08-2017, 03:52 PM Thread Starter
 
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no question that is pronounced gear whine. My 1965 GTO was a 335 HP car with a 3:23 stock rear end. That means the tranny was a wide ratio M-20 and it definitely had a gear whine similar to your chevelle in the video. I can hear it plan as day still today.
I am still baffled?
I love the sound of those gears!!

Chris
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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