A car gearbox, or transmission, transfers power from the engine to the wheels while adjusting speed and torque to match driving conditions.Core Functions of a GearboxTransfer Power: Channels rotational energy from the engine crankshaft to the drive wheels.Modify Torque: Multiplies twisting force (torque) using lower gears so the car can start moving from a standstill or climb steep hills.Adjust Speed: Uses higher gears to let the wheels spin fast while keeping the engine running at a safe, efficient speed during cruising.Reverse Direction: Engages a reverse gear to turn the wheels backward and back the car up.Prevent Stalling: Allows the engine to idle and disconnect from the wheels when the vehicle is stopped.