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Aakash Johri

6w

What is the difference between different types of automatic transmissions (AT, AMT, CVT, TC, etc.), in terms of smoothness, driving comfort, mileage, etc?

Autocar India team

Autocar India

Verified
6w
This question is often asked, and here is an easy explanation of its advantages and what to watch out for.
AMT (Automated Manual Transmission): This is the most basic type of automatic. It is essentially a manual gearbox with an automated clutch. It is the most affordable automatic and usually delivers good fuel efficiency, often close to that of a manual. However, shifts are noticeable and can feel jerky at low speeds. You will find this gearbox in affordable cars like the Maruti Suzuki Wagon R, Tata Punch, and Hyundai Exter.
Torque Converter Automatic (TC / AT): This is now commonly used in many mass-market cars like the Kylaq, Sierra, and Mahindra 7XO. It is the most consistently smooth and comfortable automatic. Gear shifts are seamless, especially in slow city traffic, making it very easy to drive. Modern torque converters have improved fuel efficiency, though they still trail the others in this regard.
CVT (Continuously Variable Transmission): This is the smoothest gearbox when it comes to city driving. CVTs don’t have fixed gears, which makes them very smooth in stop-start traffic. They are usually excellent for fuel efficiency, especially in the city. The downside is the “rubber band” effect under hard acceleration, where engine revs rise without a matching increase in speed. Overall, they are best for relaxed city driving.
DCT (Dual Clutch Transmission): This is best suited to drivers who enjoy performance and fast shifting action. DCTs offer quick gear shifts and feel sporty on open roads. They are also quite efficient. However, in heavy traffic, they can feel hesitant or jerky if not well calibrated, and long-term maintenance costs can be higher than those of other automatics.
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Tata Sierra

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Posted on: 24 Jan 2026