Why is it impossible to change from first gear to reverse while driving, but not the other way around?
In: Engineering
Forward gears have synchros, where reverse gear usually doesn’t. Synchros help to synchronise the speed of the output shaft of the gearbox(connected to wheels) to the speed of the input shaft(connected to clutch plate). This helps the gears mesh without grinding when shifting between gears. The reason they are often not found on reverse is that the car is assumed to be stationary when shifting to reverse and thus the output shaft would not be spinning,and the input shaft would stop spinning shortly after you press the clutch in.
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