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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
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.
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.
Role of transmission system in cars

Role of transmission system in cars