I saw a brand new ’69 plate car reversing today and it still made that noise so it can’t be attributed to an old gearbox
In: Engineering
The gears are cut differently. Forward gears are used more, and so they’re cut helically. This makes their engagement smoother and the gears last longer. The reverse gear, since it is used less, has straight cut gears. These are cheaper, but add that whine.
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