An automatic transmission cannot only go backwards for the following reasons:
* Gearbox Design: Automatic transmissions usually have multiple gears, including both forward and reverse gears. The gearbox design physically does not allow the car to move only backwards.
* Gear Ratio: Gearboxes are designed with different gear ratios for different gears, which determine the speed and torque at the output shaft. Reverse gears typically have a very low gear ratio, allowing the vehicle to move with more power and less speed.
* Gear shift mechanism: Automatic transmissions have a gear shift mechanism that controls the movement of the gear lever and selects the desired gear. Shifting the gear lever to the “R” (reverse) position engages reverse gear, allowing the vehicle to move backward.
If your car’s automatic transmission only goes backwards, this indicates a mechanical problem, such as:
* Problem with the gear shift mechanism
* Damage to the planetary gearbox
* Torque converter malfunction