Why is the power different after changing the transmission?

[DeViolet]

The reasons for the difference in power after changing the transmission are as follows: Incorrect use of transmission fluid: Before replacing the automatic transmission fluid, the vehicle should be parked on a level surface with the handbrake engaged and the gear selector in the P position. Prior to draining the ATF, the transmission should be warmed up to operating temperature (or the fluid should be changed after driving) to reduce the viscosity of the fluid and ensure that impurities and sediment are drained along with the fluid. Open the drain plug to release the fluid, and carefully inspect the condition of the ATF to analyze the state of the automatic transmission. Issues with the transmission valve body: If the transmission valve body is damaged, it may cause sticking. If there is a leak, it can lead to gear shift shock during the shifting process, significantly reducing shift efficiency and also causing a decrease in the vehicle's power. Mismatch between the transmission computer and other computers: Changing the transmission requires program matching because the computer needs to better control the transmission by adjusting the current values of various solenoids to ensure the transmission outputs power more effectively.