Necessity of transmission system:
1. To disconnect the engine from the driving wheels when starting the engine
2. To connect the driving wheels smoothly & without shock to the engine, when the engine is running.
3. To reduce the speed of the engine at the driving wheels in the ratio of about 4:1 in the passenger cars & in greater ratio in heavy vehicles up to 10:1.
4. To vary vehicles speed and torque according to driving conditions.
5. To transmit the power from engine to rear axle at varied angle and speed.
6. To drive the driven wheel on either side of the vehicle at different speeds while the vehicle is negotiating a turn.
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