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Noisy second on 1922 Cadillac Type 61


hidden_hunter
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Hey guys,

 

Took the type 61 out for a drive yesterday and noticed that the intermediate gear is much much noisier than low or high gears

 

I’m assuming it will be just down to wear on the gear itself rather than any other part that needs fixing?

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Unless it’s a bad grinding noise, I wouldn’t worry about gear whine too much. The straight cut gears in a sliding gear transmission are typically noisy. Third is a locking collar so the torque path bypasses all the gears in the transmission hence it should be very quiet. That’s the gear you are usually driving in. 
 

Most all the sliding gear transmission cars I’ve driven have one gear noisier than others.

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  • 2 weeks later...

Straight-cut gears work fine but they are noisy. However, they also are easier to engage. Helical gears are quieter but much more complicated to make. When most cars were open the noise wasn't an issue since you could hardly hear it. As closed cars became more common it became more important to quiet them. Cadillac adopted helical transmission gears the year before they adopted syncromesh so those transmissions are miserable to shift (that's what I had years ago).

 

Helical gears for timing were adopted for the same reason. As engines got quieter, the noise became more apparent.

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Also consider the speed at which you shift out of second gear.  These cars were built to run in high gear most of the time, when driving one does not use high revs going through shifts as in a more modern car.  You should be in high gear at 15 mph or sooner, otherwise gears will whine…

 

Edited by trimacar (see edit history)
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