Surgery of a Stick Inside a Manual Transmission
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The reverse gear uses an idler gear between the countershaft and the main shaft gears to reverse the direction of the spinning. In this way the reverse gear on the mainshaft is always spinning backward; however, it is only locked into the mainshaft when reverse is chosen. Since reverse is not usually chosen under speed it doesn't have a synchromeshing shift collar. If you were to try to grab reverse while driving fast you would very likely strip the dog gears off the gear or collar and make a terrible noise as well as fill your transmission with small pieces of metal. View Related Article
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