What are the impacts of converting a manual transmission to an automatic transmission?

[StGabriel]

If the conversion from manual transmission to automatic transmission is done properly, it will not affect the car, but it may impact vehicle inspection. There are three steps to convert a manual transmission to an automatic transmission: Modifying the clutch: This achieves the functionality of an automatic transmission, though not fully automatic—it's more like semi-automatic. You won't need to press the clutch, but you still have to shift gears manually. The main benefit is that you don’t need to press the clutch when shifting, and the engine won’t stall when braking, freeing up your left foot. Installing an automatic transmission: This actually involves retrofitting an automatic clutch system, which modifies certain components to allow the clutch to engage and disengage automatically. A series of sensors are connected to the gear lever, ECU, and other parts. When the car starts, the ECU sends a starting signal, and the driver shifts into first gear. The sensors receive these two signals and send them back to the processor for data processing. Automatic clutch system: This allows the car to come to a complete stop while in gear. The system will automatically press the clutch to prevent the engine from stalling. When starting again, simply shift into first or second gear, release the brake, and the car will move forward on its own, just like an automatic transmission.

[OMalachi]

I previously researched converting a manual transmission to automatic because driving stick in traffic is exhausting, always fantasizing about one-touch gear shifts. But after actually doing it, the impact was significant: financially, it cost a fortune—just the transmission swap alone runs 10,000 to 20,000 RMB, plus engine remapping, ECU modifications, and thousands in labor fees. The car’s resale value also drops since non-factory modifications make it harder to sell used at a good price. Driving convenience improved—no clutch at red lights—but fuel consumption may rise by 10% due to lower automatic transmission efficiency. Poor conversions can cause jerking or odd noises, and maintenance becomes a hassle, requiring checks every six months. Overall, it’s more cost-effective to just buy a used automatic car—saving both money and headaches.