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05-23-2022, 01:13 PM | #1 |
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Join Date: May 2022
Location: Collinsville, OK
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Noisy transmission
How noisy are the straight cut gears in a Model A transmission? Our second gear sounds terrible.
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05-23-2022, 03:52 PM | #2 |
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Re: Noisy transmission
Straight cut gears will have the whine associated with them in low and second gear. In high gear the main shaft dogs onto the input shaft for 1:1 drive so it doesn't whine with gear noise. Now if the noise isn't a normal gear whine in low or second gears then there may be some other problem with the gears or bearings that rotate while in those gears.
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05-23-2022, 04:42 PM | #3 |
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Re: Noisy transmission
The second gear is the hardest working gear in the box and most likely to wear out first. You can remove the shift lever assembly and evaluate the condition of the gears.
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05-23-2022, 06:25 PM | #4 |
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Re: Noisy transmission
Did you check the gear oil level in the transmission?
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05-24-2022, 07:50 AM | #5 |
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Re: Noisy transmission
The 2nd gear pair on my A is louder than 1st and 3rd as well.
As stated, check the oil first. As long as it's "just" a whine I would continue to drive it. You should notice if it gets worse. When the noise changes I would start to investigate. |
05-24-2022, 10:02 AM | #6 |
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Re: Noisy transmission
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05-24-2022, 10:42 AM | #7 |
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Re: Noisy transmission
Model A's love to whine, mine does, fresh 600w is what I use, and it shifts nice and smooth now that I rebuilt the shift tower. if it whines, don't lose sleep about it, it's normal. All cars of that era made the same sound, be it a Duesenberg, a Cadillac V16, or a Ford Model A. but if it gets so loud the neighbors notice, then look into it.
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05-24-2022, 11:39 AM | #8 |
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Location: Collinsville, OK
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Re: Noisy transmission
I've checked the oil and it's OK. Mine has more of a growl than a whine. I'm getting another transmission to go through and then I can just change it out.
Last edited by Gary57210; 05-24-2022 at 12:12 PM. |
05-24-2022, 01:39 PM | #9 |
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Re: Noisy transmission
What to look at is the tops of the gear teeth and the face of the tooth for pitting. The tooth top tells the story, this transmission is used but still serviceable, it has clash wear but the top of the tooth isn’t tapered or ‘sharpened’
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05-24-2022, 06:04 PM | #10 |
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Re: Noisy transmission
Mine is noisy in second on deacceleration, but quiet on acceleration.
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05-24-2022, 06:23 PM | #11 |
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Location: Lincoln, Nebraska
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Re: Noisy transmission
I would venture that one of the cluster gear bearings has gone bad.
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05-25-2022, 12:35 AM | #12 |
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Re: Noisy transmission
crosscut nailed it, I just had that problem resolved. Bad bearing and worn cluster gears was my issue, better trace the problem before the whole thing jams up and you get stuck.
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