Manual Transmission Reverse Gear - How it works?

For the reverse gear there is a small "reverse idler gear" between the countershaft gear and the output shaft gear. This causes the reverse gear to turn the opposite way from the other gears on the output shaft. The output shaft is a splined shaft that is more or less (via the differential) connected to the wheels.

What happens if we put reverse gear without clutch?
Your vehicle will stall and you may hear a grinding noise.

What happens when driving in reverse gear?
If the transmission was not designed with a reverse inhibit feature, engaging reverse while driving forward will, most likely, stall the engine," Renneker said. "The car won't lock-up or skid, but it will slow down a bit and act like the transmission is in neutral

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