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| Re: Tuscarora Almanac for September 10 (1635691) | |||
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Re: Tuscarora Almanac for September 10 |
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Posted by Steve B-8AVEXP on Tue Sep 10 19:45:49 2024, in response to Re: Tuscarora Almanac for September 10, posted by zac on Tue Sep 10 08:27:36 2024. The musical groaning sound was from the spur-cut bull and pinion gears. They were quite literally music to my ears; you could tell how fast you were going by the gear pitch. Postwar cars have helical-cut gears, which are much quieter. A good analogy is a manual transmission. Reverse gear has spur-cut gears, which causes that loud moaning sound when you back up. My '69 AMX's T-10 4-speed has spur-cut reverse gears, but they're not very loud when backing up. Mu '98 4Runner is a different story. Its reverse gear sings out when backing up. Forward gears are helical-cut and are quiet. Back in the olden days, when 3-speed transmissions only sychronized second and third gears, you could hear first gear moan because it had spur-cut gears, too. The first-reverse sliding gear was spur-cut as well. |
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