Transmission Allows power to be sent from an engine or motor to a drive mechanism. Use Gears and clutch to convert the speed of power source into torque. It is often referred to as a gearbox.

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3. Manual Transmission Automatic Transmission
Both carry out same function in turning engine speed into
torque.
They also allow the drive mechanism to shift from forward
into reverse

4. Manual Transmission
It increases the speed of an engine, as a result of
shifting gears manually.
Larger Gears convert higher engine rpm into
higher torque.
Smaller Gears convert lower engine rpm into
higher speed.

5. Automatic Transmission
It accomplishes same function through speed-torque
conversion.
A torque converter automatically engages and disengages the
accurate gears in the suitable ratio using clutch hydraulics.
Larger Gears increases the speed of the drive wheels
Smaller Gears decreases the speed of the drive wheels.